Organic & Biomolecular Chemistry

Article	Citations
Copper( ii ) nanodots stabilized on Cassia fistula galactomannan: preparation and catalytic applicatio	187
Synthesis of optically active cyclopropanes by functionalization of cyclopropenes	122
Asymmetric synthesis of ( R )-baclofen and (3 S ,4 S )-tetf	85
Base-mediated synthesis of aryl enol ethers from α-aryl allylic alcohols and arylsulfonium salts	80
Synthesis of 3-sulfonylisoindolin-1-ones from olefinic amides and sodium sulfinates via electrooxidative tandem cyclization	76
Site-selective benzylic C–H hydroxylation in electron-deficient azaheterocycles	74
Bioorthogonal fluorogenic chemistry using a light-activated tetrazine	71
Direct formylation of phenols using difluorocarbene as a safe CO surrogate	68
Albumin–ruthenium catalyst conjugate for bio-orthogonal uncaging of alloc group	68
Nonsilyl bicyclic secondary amine catalyzed Michael addition of nitromethane to β,β-disubstituted α,β-unsaturated aldehydes	65
Recent progress in the homogeneous gold-catalysed cycloisomerisation reactions	64
A macrocycle-based new organometallic nano-vessel towards sustainable C2-selective arylation of free indole in water	64
On the divergent reactivity of allenylstannanes generated from the O-directed free radical hydrostannation reaction of (±)- trans -3-(2-phenylcyclopropyl	62
Butterflyene: an entry into an aesthetically pleasing carbocycle via a Diels–Alder reaction on a tetrasubstituted olefin	60
Structure–activity relationship of neplanocin A analogues for the identification of novel anti-HBV leads	54
Amine adducts of triallylborane as highly reactive allylborating agents for Cu( i )-catalyzed allylation of chiral sulfinylimines	52
Total synthesis, stereochemical assignment, and biological evaluation of opantimycin A and analogues thereof	47
Anthracene-isatoic anhydride hybrids for bioconjugation: chromophores with nucleophile dependent response	46
Combining synthetic biology with synthetic electrochemistry to expand the chemical space of the indolocarbazole family	45
α-Alkylation of ketones with primary alcohols by an active non-noble metal Cu/CuOx catalyst	42
Intermolecular hydrogen bonding behavior of amino acid radical cations	41
A substrate-induced dual utilization cascade reaction of N -alkyl anilines: highly site-selective sustainable synthesis of chromeno[4,3-	40
Glyoxylic acid monohydrate promoted reductive addition of sodium sulfinates to pillar[4]arene[1]quinone	40
Oxa-azabenzobenzocyclooctynes (O-ABCs): heterobiarylcyclooctynes bearing an endocyclic heteroatom	39
N -Functionalized fluorophores: detecting urinary albumin and imaging lipid droplets	38

Back cover	37
An efficient direct electrolysis method for the synthesis of 1,1,1,3,3,3-hexafluoroisopropyxy substituted imidazo[1,2- a ]pyridines	37
Unusual C-2 selectivity of Grignard additions to N -Boc-protected isatin 3-imines	36
(Dimethylamino)methylene hydantoins as building blocks in the synthesis of oxoaplysinopsins and parabanic acids with antifungal activity	36
Back cover	36
Metallocenium incorporated charge-enhanced thiourea catalysts	36
Investigating tedizolid analogues as a new class of herbicides	36
Carboxylate migration from ethyl cyanoformate to methylene: rapid access toward pyrrolo[1,2- a ]pyrazines	36
Contents list	36
Total synthesis of (−)-griseocazine D2 and D3	35
A novel synthetic method for backbone-cyclized polypeptide POL7080 with the help of hydrophobic-support materials	35
Rapid paper-based optical sensing of Spilosoma obliqua nucleopolyhedrovirus via ester hydrolysis	34
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Photoredox-catalysed radical difluoromethylation/cyclization of N -acryloyl-2-arylbenzimidazole to access CF 2	33
Highly oxygenated steroids with immunosuppressive activity from Solanum undatum	33
Advances in the synthesis of rearranged homoisoflavonoids	32
A rhodium-catalyzed cascade C–H activation/annulation strategy for the expeditious assembly of pyrrolidinedione-fused 1,2-benzothiazines	32
Recent applications of Cyrene as a chiral synthon	32
Contents list	32
Hydroboration of vinylsilanes providing diversity-oriented hydrophobic building blocks for biofunctional molecules	32
Concise total synthesis of (±)-applanatumol Y	31
Au( iii )/TPPMS-catalyzed Friedel–Crafts benzylation of deactivated N -alkylanilines in water	31
Efficient synthesis of functionalized alkylidenephthalides, butenolides, pyranones, and isocoumarins via I 2	31
Design, synthesis, and biological evaluation of multiple F-18 S1PR1 radiotracers in rodent and nonhuman primate	31
Visible light-promoted C3–H alkoxycarbonylation of quinoxalin-2(1 H )-ones or coumarins with alkyloxalyl chlorides	30
Substrate-controlled divergent synthesis of substituted carbazoles through a cascade reaction of 2-alkenylindoles with α,β-unsaturated ketones	30
Visible light-promoted cascade synthesis of pyrazolidinones via N -aryl glycine and azomethine imines	30
Back cover	29
Contents list	29
An electron donor–acceptor complex-initiated C–H trifluoromethylation and perfluoroalkylation of enamides and quinoxalinones	29
Synthesis of mixed phosphorotrithioates via thiol coupling with bis(diisopropylamino)chlorophosphine and sulphenyl chloride	29
Copper-catalyzed cross-coupling reaction of epoxides with allyl boron ester	29
Photodriven, TFA-promoted oxidative dehydrogenative coupling of quinoxalin-2(1 H )-ones with 5-pyrazolones	28
Contents list	28
Sequential regioselective arylation of pyrazolones with diaryliodonium salts	28
Back cover	28
Photocatalyst-free synthesis of quinazolinones from o -aminobenzamides and rongalite under visible light	28
Radical alkylation of acrylamides with peroxides to access mono/dialkylated fused N-heterocycles	27
Photochemistry of 2-(2-formylphenyloxy)acetic acid derivatives: synthesis of hydroxychromanones and benzofuranones	27
The boron effect on radical difluoromethylation of N -sulfonyl cyclic ketimines	27
Trivalent dialkylaminopyridine-catalyzed site-selective mono- O -acylation of partially-protected pyranosides	27
Complementary strategies for synthesis of sulfinamides from sulfur-based feedstock	27
Recent advances in synthesis of stilbene derivatives via cross-coupling reaction	27
Asymmetric synthesis of atropisomeric arylpyrazoles via direct arylation of 5-aminopyrazoles with naphthoquinones	27
Front cover	26
Fluorescent α-amino acids via Heck–Matsuda reactions of phenylalanine-derived arenediazonium salts	26
Back cover	26
Transition metal-free one-pot tandem chemoselective reduction and cyclization of 3/5-(2-nitrophenyl)-1 H -pyrazoles using sodium dithionite	26
A mitochondria-targeted colorimetric and NIR ratiometric fluorescent probe for biothiols with large Stokes shift based on thiol–chromene click reaction	26

Multi-purpose thiocyanate protic ionic liquids in chemodivergent transformations of imidazolidin-2-(thi)one-based diols	26
Correction: C–H bond cyanation: electrochemical synthesis of phenylbenzimidoyl cyanide derivatives	26
Regioselective synthesis of enantiopure 1,2- and 1,3-dispirooxindoles along with a DFT study	26
Efficient construction of spirocyclopentane-1,3-dioxindoles via an annulation reaction of isocyanides and 3-methyleneoxindoles	25
Base-promoted intermolecular cyclization of substituted 3-aryl-3-chloropropenals with tetrahydro-β-carboline: a method for the synthesis of indolizino[8,7- b	25
Lewis acid mediated allylation of vinyl diazonium ions by allylstannanes	25
Design, synthesis and evaluation of antiproliferative effects of ferritin-targeted degraders	25
Environmentally benign esterification and disproportionation using activation of acid anhydrides by molecular sieves 3A	25
High-throughput DoE synthesis of chalcones and pyrazolines for fluorescent sensing	24
Flavin-induced charge separation in transmembrane model peptides	24
Access to functionalized 2-pyrones through cascade reactions of α-halothioesters involving DBU-derived ammonium ylides	24
Cu 2 O-mediated regio- and stereoselective one-pot synthesis of ( Z )-3-ylidenephthalides from 2-iodob	24
Metal-free quinoline synthesis via Brønsted acid-promoted cyclization of ene-ynamides	24
A poly-pseudorotaxane constructed by threading pillar[5]arene onto an ion-pair recognition-based calix[4]pyrrole supramolecular polymer	24
Sumanene–carbazole conjugate with push–pull structure and its chemoreceptor application	23
Exploring synthetic routes to 6-functionalized 4-azaspiro[2.3]hexanes	23
Synthesis of primary propargylic alcohols from terminal alkynes using rongalite as the C1 unit	23
TropMol: a cloud-based web tool for virtual screening and early-stage prediction of acetylcholinesterase inhibitors using machine learning	23
Correction: Formal synthesis of cyclotheonellazole A	23
Direct C–H functionalisation of azoles via Minisci reactions	23
Genome mining and heterologous expression reveal streptacidin, a new lasso peptide from Streptacidiphilus jiangxiensis	23
Sequential condensation and double desulfonylative cyclopropanation of 1,2-bis(sulfonylmethyl)arenes with 3-arylacroleins: access to biscyclopropane-fused tetralins	23
Annulation of aliphatic nitro compounds with β-styryl sulfonium salts toward the synthesis of isoxazoline N -oxides	23
Practical synthesis of unsymmetrical disulfides promoted by bromodimethylsulfonium bromide	23
3,5-Di(trifluoromethyl)phenyl(cyano)iodonium triflate as a novel and potential activator for p -tolyl thioglycoside donors	23
Mechanochemical deprotection of t -butoxycarbonyl (Boc) group using basic alumina	23
Photocatalytic radical addition/bicyclization of 1,7-enynes with N -sulfonylaminopyridinium salts/sulfamoyl chlorides: access to sulfonamide-containing b	22
Visible light-mediated synthesis of quinazolinones and benzothiadiazine-1,1-dioxides utilizing aliphatic alcohols	22
Recent advances in Ugi reaction and its post-transformation strategies for crafting diverse indole frameworks	21
An imine condensation/1,5-electrocyclization cascade enabled permanent aldehyde–amine coupling through a triazole linkage	21
Visible-light-mediated radical difunctionalization of alkenes with aromatic aldehydes	21
Palladium-catalyzed α-arylation of sulfoxonium ylides with aryl fluorosulfates	21
Radical coupling of aryl halides to arenes facilitated by Ni(COD)(DQ) and other nickel sources	21
Chemistry of installing epitranscriptomic 5-modified cytidines in RNA oligomers	21
Flexible and rigid “chirally distorted” π-systems: binaphthyl conjugates as organic CPL-active chromophores	21
Front cover	21
DNA preference of indenoisoquinolines: a computational approach	21
Dithioallyl cation (3 + 2) cycloadditions under aprotic reaction conditions: rapid access to spiro-fused cyclopentane scaffolds	21
Synthesis of fused 3-trifluoromethyl-1,2,4-triazoles via base-promoted [3 + 2] cycloaddition of nitrile imines and 1 H	21
Deciphering substitution effects on reductive hydroalkoxylation of alkynyl aminols for stereoselective synthesis of morpholines and 1,4-oxazepanes: total synthesis of tridemorph and fenpropimorph	20
Recent advances in the organocatalytic enantioselective construction of alkynyl-containing tetrasubstituted carbon stereocenters	20
Diazo compounds: synthesis, carbene generation and reactivity	20
Self-assembly of azamacrocyclic ligands into vesicular structures: from design to functional properties and applications	20
Design and synthesis of fluorescent-dye-labeled nucleotide with a new cleavable azo linker for DNA sequencing by synthesis	20
Electrochemical alkylation of C(sp 2 )–H bonds via halogen-atom transfer (XAT) from alkyl iodides	20
Metal triflimide-mediated acylation of sulfonamides and transacylation of N -acylsulfonamides	20
Green and efficient synthesis of pure β-sulfonyl aliphatic sulfonyl fluorides through simple filtration in aqueous media	20
Light-driven reductive cyclization catalyzed by vitamin B 12 -based artificial photoenzymes	20
Mechanochemical arylative detrifluoromethylation of trifluoromethylarenes	20
Aggregation induced emission and volatile acid vapour sensing in acridine appended poly (aryl ether) based low molecular weight organogelator	19
Back cover	19
Contents list	19
Rhodium/copper dual catalysis for defluorinative annulation of gem -difluorocyclopropanes with phenols	19
TMSOTf-catalyzed Michaelis-Arbuzov reaction of triorganyl phosphites with sterically bulky alcohols	19
TsOH-catalyzed acyl migration reaction of the Bz-group: innovative assembly of various building blocks for the synthesis of saccharides	19
Racemic peptide assembly boosts biocatalysis	19
Alkylation and silylation of α-fluorobenzyl anion intermediates	19
C–H activation-initiated spiroannulation reactions and their applications in the synthesis of spirocyclic compounds	19
Photoinduced halogen-bonding enabled synthesis of oxindoles and isoindolinones from aryl iodides	19
Samarium diiodide/samarium-mediated direct deoxygenative hydroborylation of ketones with hydroborane esters	19
Back cover	19
Light-induced ligand-to-metal charge transfer of Fe( iii )-OR species in organic synthesis	19
Recent advances in the multicomponent synthesis of pyrazoles	19
A facile approach to phenothiazinones via catalytic aerobic oxidation: discovery of an antiproliferative agent	18
Sequential nucleophilic aromatic substitutions on cyanuric chloride: synthesis of BODIPY derivatives and mechanistic insights	18
Contents list	18
Multifunctional supramolecular receptors: aqueous ion recognition, HCl sensing and cytotoxic potential	18
An NNN Pd( ii ) pincer complex with 1,1-diaminoazine: a versatile catalyst for acceptorless dehydrogenative coupling reactions	18
Well-defined cobalt( ii )-catalyzed synthesis of perimidine derivatives via acceptorless dehydrogenati	18
Ethyl 3-bromopropanoate mediated tandem Knoevenagel–aldol annulation: a new strategy for the synthesis of indolizines	18
Front cover	18
Direct transition-metal-free synthesis of 2-heteroaryl-4-quinolones via ANRORC type rearrangement of 3-(2-(2-nitrophenyl)-2-oxoethyl)quinoxalin-2(1	18
Controlled packing of metal–peptide superhelices with β-peptide foldamers	18
Synthesis of tetracyclic dibenzo[ b , f ][1,4]oxazepine-fused β-lactams via	18
Straightforward access to α-carbonyloxy esters and β-keto thioethers from aryldiazoacetates	18
Synthesis of tetrahydropyrrolo[1,2- a ]quinolinone analogues via CoCl 2	18
Strategies for the optimisation of troublesome peptide nucleic acid (PNA) sequences	18
Reductive deoxygenation of tertiary alcohols: a cobalt-catalyzed hydrosilylation approach	18
Highly efficient esterification of carboxylic acids with O–H nucleophiles through acid/iodide cooperative catalysis	18
Coordination complexes of P III -doped heterobuckybowls and their applications in catalysis	18

Synthesis of cinnamic esters and acids via palladium-catalyzed reactions of aryl diazonium salts and their biological evaluation	18
Palladium-catalyzed 1,4-migration for the regioselective C–H bond functionalization at C2-position of 3-arylthiophenes	18
Adapting Bower's intramolecular aziridination reaction allows for a metal-free synthesis of N–H aziridines	18
Exploring α-electron-deficiency-induced [1,2]-fluorine migration	18
Two short approaches to the COVID-19 drug β- d - N 4 -hydroxycytidine a	18
Phthalimide-based sulfur transfer reagents for the preparation of biologically relevant trisulfides	18
New P,N sp3 ligands for palladium-catalyzed asymmetric allylic substitutions	18
Diastereoselective synthesis of trans -2,3-dihydroindoles via formal [4 + 1] annulation reactions of a sul	18
Photo-induced radical transformations of tosyl cyanide	18
Catalyst-controlled regiodivergent Friedel–Crafts reactions of 1-naphthols with 2,3-dioxopyrrolidines: synthesis of polycyclic 2-pyrrolidinones	18
Transition-metal-free [4 + 2] cyclocondensation of diaryliodonium salts accessing phenazine, phenothiazine, phenoxazine and dioxane derivatives	18
Biocompatible silicomolybdic acid-promoted one-pot expeditious synthesis of 1,2,3- NH -triazoles	17
Controllable conformation and reactivity of bicyclic α-methylene cyclopentanones and their NF-κB pathway inhibitory activity	17
Construction of a 1,2-diazetidine core based on a multicomponent reaction of N , N ′-(2,3-dimethylbutane-2	17
Antiadhesive glycoconjugate metal complexes targeting pathogens Pseudomonas aeruginosa and Candida albicans	17
Synthesis of fluorinated curcumin derivatives for detecting amyloid plaques by 19 F-MRI	17
InCl 3 catalyzed simultaneous reductive sulfoximination and O -silylation: synthesis of silyloxy benzy	17
Azacoumarin-based “turn-on” fluorescent probe for the detection and imaging of hydrogen peroxide in living cells	17
Transition metal-free rongalite-mediated geminal C(sp 3 )– H functionalization of fluorenes	17
Contents list	17
HFIP-mediated C-3-alkylation of indoles and synthesis of indolo[2,3- b ]quinolines & related natural products	17
Organocatalytic cyclization-rearrangement cascade reaction: asymmetric construction of γ-lactams	17
Reductive cross-coupling of N -acyl pyrazole and nitroarene using tetrahydroxydiboron: synthesis of secondary amides	17
Iodine/Oxone® oxidative system for the synthesis of selenylindoles bearing a benzenesulfonamide moiety as carbonic anhydrase I, II, IX, and XII inhibitors	17
Access to functionalized benzo[ b ]fluorene/benzo[ a ]anthracene derivatives through TfOH-promoted tandem	17
A HMPA–H 2 O mediated oxygenative carbocyclization of 2-alkynylphenyl-substituted p -quinone methides	17
Atropisomerism about aryl–C(sp 3 ) bonds: chemically driven rotational pathway in cannabidiol derivatives	17
Cyclopropanation reactions by a class I unspecific peroxygenase	17
Visible-light promoted oxidative annulation of 2-naphthols with phenylglyoxal monohydrates toward hydroxy-naphthofuranone and its derivatives	17
Synthetic studies towards naturally occurring aporpinones: asymmetric synthesis of 1′-deshydroxymethyl analogues of aporpinone A, aporpinone B and 4′-hydroxyaporpinone A	17
A pathway to synthesize 2-methylbenzothiazole derivatives via a hydrogen sulfide promoted tandem reaction of calcium carbide and 2-iodoaniline	16
Multistep synthesis of cationic lipid-like compounds based on a difluorotetrahydropyridine scaffold as amphiphilic nanocarriers	16
Recent advances in photocatalytic and transition metal-catalyzed synthesis of disulfide compounds	16
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Front cover	16
N -Arylation of isatins with diaryliodonium salts under transition metal-free conditions	16
Combining local conformational preferences and solvophobic effects in helical aromatic oligoamide foldamers	16
Electrochemically enabled decyanative C(sp 3 )–H oxygenation of N -cyanomethylamines to formamides	16
Development of an activity-based chemiluminogenic probe for γ-glutamylcyclotransferase	16
Cationic halogenated BODIPYs as water-soluble photosensitizers for photodynamic therapy	16
Synthesis of linear O -aryl carbamates and S -thiocarbamates via	16
Combinatorial synthesis of substituted pyrazolo-fused quinazolines by the Rh( iii )-catalyzed [5 + 1] annulation of phenyl-1 H	16
Copper-catalyzed enantioselective propargylic [3 + 2] cycloaddition: access to oxygen heterocycles featuring a CF 3 -substituted quaternary stereocen	16
Contents list	16
Ribosomal incorporation of N -acetyl-3,5-bis(chloromethyl)benzylthio- l -alanine for developing an mRN	16
4,9- and 4,10-Substituted pyrenes: synthesis, successful isolation, and optoelectronic properties	16
Access to 4-methylene-phospholenes through BF 3 ·Et 2 O catalyzed isomerization of 3,4-dimethylpho	16
Electrocatalytic selenocyclization for the synthesis of selenium-containing oxazolidinones	16
Synthesis of dihydrogambirtannine by alkyne [2 + 2 + 2]-cyclotrimerisation	16
Back cover	16
Rh III -catalyzed C–H heteroarylation and C–N cleavage: direct access to C2-heteroarylated (NH)-indoles	16
K 2 CO 3 -mediated annulation of 1,3-acetonedicarboxylates with 2-fluoro-1-nitroarenes: synthesis	16
Asymmetric synthesis of spiro[benzofuran-pyrrolidine]-indolinedione via bifunctional urea catalyzed [3 + 2]-annulation	16
Triaza-tricyclanos – synthesis of a new class of tricyclic nucleoside analogues by stereoselective cascade cyclocondensation	16
P-Stereodefined morpholino dinucleoside 3′,5′-phosphorothioates	16
ANRORC type rearrangement/intermolecular cyclocondensation cascade of 5,6-dicyano-3-(2-oxo-2-ethyl)pyrazin-2(1 H )-ones with hydrazine hydrate for the sy	15
Divergent synthetic studies towards bisabosqual A and fargenone B via an intramolecular S N 2 reaction	15
Mechanistic characterisation of a fungal fusicoccane-type diterpene synthase involved in the biosynthesis of talaro-7,13-diene	15
Synthesis of masked α,β-unsaturated trifluoromethyl ketones via iodine( iii )-mediated double decarbox	15
Back cover	15
An aromatic layered foldamer based on a ( cis , cis )-squaramide: chiral induction and absolute structure	15
Contents list	15
A telescoped diastereoselective synthesis of phthalimido-substituted spiro-oxazoline oxindoles via an aziridine expansion strategy	15
“Cation Pool” generated from DMSO and 1,2-dihaloethanes and their application in organic synthesis	15
Injectable gelatin–PEG hydrogels obtained via cytochrome C-mediated polymerization	15
Contents list	15
Contents list	15
Forging the tricyclic core framework of euphordraculoate B via a Barbier-type allyl addition	15
Asymmetric total syntheses of passifetilactones A, C, E and 4- epi -passifetilactone B	15
Enhanced molecular binding affinity toward aromatic dications by anthracene-derived crown ethers in water	15
Cu-catalyzed convenient synthesis of 2-trifluoromethyl benzimidazoles via cyclization of o -phenylenediami	15
Enal-azomethine ylides: application in the synthesis of functionalized pyrroles	15
Submicromolar fluorescence ‘turn-on’ detection of fluoride anions using meso -(tetra-aryl) calix[4]pyrrole	15
Zirconium oxide nano-catalyzed synthesis of pharmacologically important bis(indolyl)methanes: a highly efficient and mild approach	15
Asymmetric magnesium catalysis for important chiral scaffold synthesis	15
Damage of amino acids by aliphatic peroxyl radicals: a kinetic and computational study	15
Securinega alkaloids from the twigs of Flueggea suffruticosa as novel modulators of the skin circadian clock	15
BF 3 ·OEt 2 -catalyzed/mediated alkyne cyclization: a comprehensive review of heterocycle synthesi	15
Supramolecular assembly of pyrene–DNA conjugates: influence of pyrene substitution pattern and implications for artificial LHCs	15
Cu@g-C 3 N 4 heterojunction-catalyzed visible-light-driven direct C–H alkylation of heterocycles	14
Biocatalysis: an enabling technology for pharmaceutical chemistry	14
Formation of lignin alkyl-O-alkyl ether structures via 1,6-addition of aliphatic alcohols to β-O-4-aryl ether quinone methides	14
Pretzelanes, [1]rotaxanes and molecular figures-of-eight – crossing the bridge from fundamentals to functional applications	14
Phosphine-catalysed transformations of ortho - and para -quinone methides	14
Catalytic I 2 -moist DMSO-mediated synthesis of valuable α-amidohydroxyketones and unsymmetrical gem -	14
TiCl 4 -mediated deoxygenative reduction of aromatic ketones to alkylarenes with ammonia borane	14
Recent advances in ring-opening of cyclobutanone oximes for capturing SO 2 , CO or O 2 via	14
One-step synthesis of favipiravir from Selectfluor® and 3-hydroxy-2-pyrazinecarboxamide in an ionic liquid	14
Monoterpenoid selenophenes derived from (−)-carvone with GPx-like activity	14
The chemistry of 2-hydroxy-β-nitrostyrenes: versatile intermediates in synthetic organic chemistry	14
Front cover	14
Computational insights into the origins of regio- and enantioselectivities in palladium-catalyzed allylic substitution reactions	14
Metal-free, visible-light-mediated phototransformations of ortho -biaryl appended chalcones: access to oxathia[5]helicenes and 1,2,3,4-tetrasubstituted c	14