Dithiazoles and related compounds. Part 3. Preparation of 5H-1,4,2-dithiazoles via 1,3-dipolar cycloadditions between nitrile sulphides and thiocarbonyl compounds, and some conversions into 3,5-diaryl-1,4,2-dithiazolium salts
作者:Kwok-Fai Wai、Michael P. Sammes
DOI:10.1039/p19910000183
日期:——
Thermolysis of 1,3,4 -oxathiazol-2-ones 3 in the presence of thiocarbonyl compounds gives modest to good yields of the little-known 5H-1,4,2-dithiazoles 1, the reaction being successful with diaryl, aryl alkyl and dialkyl ketones, and thiono esters, but failing with dithio esters and tertiary thioamides. The influence of substituents is discussed. Solvolysis of 5-ethoxy-5H-1,4,2-dithiazoles, derived
在硫代羰基化合物的存在下,对1,3,4-氧杂噻唑-2-酮3的热解反应可得到中等程度的中等收率的鲜为人知的5 H -1,4,2-二噻唑1,该反应可成功地与二芳基,芳基烷基和二烷基酮,以及硫代酸酯,但不能与二硫代酯和叔硫代酰胺结合使用。讨论了取代基的影响。5-乙氧基-5 H -1,4,2-二噻唑类化合物,由硫代酸酯衍生,与高氯酸在乙酸酐中溶剂化,可高产率生成3,5-二芳基-1,4,2-二噻唑鎓盐9。
Mechanism of oxidation of α,β-unsaturated thiones by singlet oxygen
作者:V.Pushkara Rao、V. Ramamurthy
DOI:10.1016/s0040-4020(01)96589-5
日期:1985.1
of α,β-unsaturated thiones yields the corresponding ketones as the only product. Studies carried out on three systems, namely thioketones, α,β-unsaturated thiones and thioketenes, have revealed that there exists a similarity in their mechanism of oxidation. It has been suggested that the thiocarbonyl chromophore is the site of attack by singlet oxygen in α,β-unsaturated thiones and that the adjacent
Mechanistic investigations into the photochemical oxidation of thioketones
作者:N. Ramnath、V. Ramesh、V. Ramamurthy
DOI:10.1039/c39810000112
日期:——
Singlet-oxygen reaction with dialkyl, aryl alkyl, and diaryl thioketones is found to give the corresponding sulphines and ketones in proportions depending on the nature of the thioketone.
Reduction by a Model of NAD(P)H. 36. First and Direct Evidence for the Multi-step Mechanism
作者:Shinro Yasui、Kaoru Nakamura、Atsuyoshi Ohno、Shinzaburo Oka
DOI:10.1246/bcsj.55.196
日期:1982.1
solvent. In contrast, no incorporation of deuterium into the product was observed in the reduction of thiopivalophenone with BNAH or Me2PNPH under the same conditions. These results can be accounted for in terms of an electron transfer followed by a proton transfer from the model to substrate. This is the first and direct evidence for the ion radical-pair intermediacy for reductions by model compounds of
Preparation of 5H-1,4,2-dithiazoles via 1,3-dipolar cycloadditions of nitrile sulphides to thiocarbonyl compounds; the first synthesis of a 3,5-diaryl-1,4,2-dithiazolium salt
作者:Kwok-Fai Wai、Michael P. Sammes
DOI:10.1039/c39880000852
日期:——
Nitrilesulphides from the thermal decomposition of 1,3,4-oxathiazol-2-ones add to thiocarbonyl compounds giving moderate to high yields of 5H-1,4,2-dithiazoles; an adduct from O-ethyl thiobenzoate has been converted into 3-(4-nitrophenyl)-5-phenyl-1,4,2-dithiazolium tetrafluoroborate.
来自1,3,4-恶噻唑-2-酮的热分解的腈腈加到硫代羰基化合物中,产生中等至高产率的5 H -1,4,2-二噻唑;来自硫代苯甲酸O-乙酯的加合物已转化为四氟硼酸3-(4-硝基苯基)-5-苯基-1,4,2-二噻唑鎓。