A series of Se-aryl carboselenothioates 3 (RCSSeAr, R=alkyl, aryl) were synthesized and characterized from the reaction of bis(thioacyl) sulfides 1 with sodium areneselenolates. The thionselenolesters 3 are stable (liquid or crystals) both thermally and to moisture. Reactions of 3 with aliphatic primary and secondary amines gave the corresponding ammonium carbodithioates 8 together with diphenyl diselenide
A Facile and Concise Synthesis of 2-Alkyl- and 2-Aryl-4-oxo- 4<i>H</i>thiopyrano[2,3-<i>b</i>]pyridines
作者:Axel Couture、Pierre Grandclaudon、Eric Huguerre
DOI:10.1055/s-1989-27288
日期:——
2-Alkyl- and 2-aryl-4-oxo-4H-thiopyrano[2,3-b]pyridine can be conveniently prepared by reacting the appropriate aromatic and aliphatic O-ethyl thiocarboxylates with the sodium derivative of various alkyl 3-(2-bromopyridyl) ketones.
A New and Concise Synthesis of 3-Aryl- and 3-Alkyl-1<i>H</i>-2-benzothiopyran-1-ones (Thioisocoumarins)
作者:Axel Couture、Hélène Cornet、Pierre Grandclaudon
DOI:10.1055/s-1990-27113
日期:——
3-Aryl- and 3-alkyl-1H-2-benzothiopyran-1-ones are readily accessible by reaction of the lithiated N,N-diethyl-o-toluamide (N,N-diethyl-2-methylbenzenecarboxamide) with appropriate aromatic, heteroaromatic and aliphatic thioesters.
Mechanistic studies in strong acids. VIII. Hydrolysis mechanisms for some thiobenzoic acids and esters in aqueous sulfuric acid, determined using the excess acidity method
作者:Robin A. Cox、Keith Yates
DOI:10.1139/v82-438
日期:1982.12.15
The excess acidity method has been applied to hydrolysis rate data, obtained as a function of medium composition, for four thiobenzoic acids, thioacetic acid, eight ethyl thiolbenzoates, and eight ethyl thionbenzoates in aqueous sulfuric acid. The mechanistic behaviour thus revealed has both similarities to and differences from that of a typical ester like ethyl benzoate, which gives benzoic acid by
β-Thioxoketones. Part 6. Electronic absorption spectra of aromatic β-thioxoketones. A study of enol–enethiol tautomerism
作者:Lars Carlsen、Fritz Duus
DOI:10.1039/p29800001768
日期:——
Aromaticβ-thioxoketones exist in solution as mixtures of rapidly interconverting Z-enol and Z-enethiol tautomers. The electronicabsorptionspectra exhibit in general four absorption bands in the u.v.–visible region at ca. 265 (ArCO, π,π*; ArCC π,π*), 330 (ArCS π,π*; OCCCS π,π*; CO n,π*), 415 (OCCCS π,π*), and 520 nm (CS n,π*), respectively. The β-thioxoketones are converted by sodium hydroxide into
芳族β-硫代酮作为快速相互转化的Z-烯醇和Z-烯硫醇互变异构体的混合物存在于溶液中。电子吸收光谱在大约uv的可见光区域一般表现出四个吸收带。265(ArC O,π,π*; ArC Cπ ,π*),330(ArC Sπ ,π*; O CC CSπ,π*; C O n,π*),415(OC CC Sπ, π*)和520 nm(C S n,π*)。β-硫代酮被氢氧化钠转化为相应的阴离子。CNDO / B计算预测,β-硫代木酮酸酯中的负电荷会在OCCCS系统上离域,这表明同时存在镰刀或W形构型。β-硫代酮酸酯的约2个特征吸收带。分别将275和400 nm分配给涉及Ar–C C C–Ar'和S C C C C O发色团的π,π*跃迁。烯醇-烯硫醇互变异构平衡已通过低温光谱法进行了研究。在室温下的平衡常数(K 293已经发现3 - 5的)对应于4:1的烯醇-烯硫醇浓度比。已经发现,反应熵(ΔS r)对