- Conformational preferences and supramolecular aggregation in 2-nitrophenylthiolates: Disulfides and thiosulfonates
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In each of the asymmetrically substituted disulfides 2-nitro-4′-methyldiphenyl disulfide, C13H11NO2S2 (1), 2-nitro-4′-chlorodiphenyl disulfide, C12H8ClNO2S2 (2), 2,4-dinitro-4′-methyldiphenyl disulfide, C13H10N2O4S2 (3), and 2,4-dinitrophenyl-2′-methoxycarbonylmethyl disulfide, C9H8N2O6S2 (4), and in both of the symmetrically substituted disulfides bis(2-nitrophenyl) disulfide, C12H8N2O4S2 (5), and bis(2-nitro-4-trifluoromethylphenyl) disulfide, C14H6F6N2O4S2 (6), the 2-nitro groups are essentially coplanar with the adjacent aryl ring and the S atom remote from the nitrated aryl ring is also essentially coplanar and transoid to the nitro group. In S-(2-nitrophenyl) 2-nitrobenzene thiosulfonate, C12H8N2O6S2 (7), which contains three independent molecules in the asymmetric unit, all six of the independent nitro groups are twisted out of the plane of the adjacent aryl rings. The crystal structures of (1)-(3) contain isolated molecules, that of (4) contains centrosymmetric dimers held together by C-H...O hydrogen bonds, while in the structures of (5)-(7), respectively, the C-H...O hydrogen bonds generate one-, two-and three-dimensional arrays. The interplay between molecular conformation and supramolecular aggregation is discussed.
- Glidewell, Christopher,Low, John N.,Wardell, James L.
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p. 893 - 905
(2007/10/03)
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- Process for preparing chloromethyl thiazoles or oxazoles, and intermediates for use therein
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Chloromethyl group substituted heterocyclic compounds of the formulae STR1 wherein X is O or S; Y together with the two carbons to which Y is attached forms phenyl, pyridyl or pyrimidyl, each of which may be substituted by R; R is one of iodo or trifluoromethylthio or one or two of fluoro, chloro, bromo, (C1 -C4)alkyl, (C1 -C4)alkoxy, (C1 -C4)alkylthio, (C1 -C4)alkylsulfinyl, (C1 -C4)alkylsulfonyl or trifluoromethyl; and R1 is hydrogen or R, are prepared by reacting a bifunctional compound of the formulae STR2 with a 2-chloro-1,1,1-tri(C1 -C6)alkoxyethane. Most of the compounds of formulae I and II are novel. These compounds are intermediates of use in the preparation of compounds having pharmaceutical activity. The 2-chloro-1,1,1-tri(C1 -C6)alkoxyethanes are prepared from the corresponding tri(C1 -C6)alkoxyethanes by chlorination with N-chlorosuccinimide or with chlorine in pyridine and a chlorohydrocarbon cosolvent.
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- Synthesis of 6-trifluoromethyl-4h-1,4-benzothiazines as possible anticancer agents
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The synthesis of 6-trifluoromethyl-4H-1,4-benzothiazines is reported by the condensation and oxidative cyclization of 2-amino-4-trifluoromethylbenzenethiol hydrochloride with β-di- carbonyl compounds. All the newly synthesized compounds have been characte
- Gupta,Kumar, Rakesh
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- THE SYNTHESIS OF o-NITROBENZENETHIOLS: AN ADVANTAGEOUS NUCLEOPHILIC DISPLACEMENT ON o-CHLORONITROBENZENES
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Reaction of substituted o-chloronitrobenzenes with sodium sulphide in DMSO occurs rapidly and gives the corresponding o-nitrobenzenethiols, following a convenient one-step pathway.Better yields are obtained when stoicheiometric amounts of sulphur, dissolved in a little carbon disulphide, are added in the presence of ethyl methyl ketone as solvent.
- Battistoni, Paolo,Bruni, Paolo,Fava, Gabriele
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p. 301 - 304
(2007/10/02)
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