SASAKI TADASHI; HAYAKAWA KENJI; HISHIDA SUMIO, J. CHEM. SOC. CHEM. COMMUN., 1980, NO 22, 1054-1055
作者:SASAKI TADASHI、 HAYAKAWA KENJI、 HISHIDA SUMIO
DOI:——
日期:——
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作者:N. A. Keiko、E. A. Funtikova、L. G. Stepanova、Yu. A. Chuvashev、A. I. Albanov、M. G. Voronkov
DOI:10.1023/a:1013909715161
日期:——
The reaction between 2-alkoxypropenals and 2-mercaptoethanol was studied at 20 and 60degreesC by means of H-1 NMR and GC-MS methods. Under kinetically controlled conditions (20degreesC, 7-30 days) with no catalyst the addition of 2-mercaptoethanol to 2-alkoxypropenals occurs along Markownikoff rule. The arising 2'-hydroxyethylthio-2-alkoxypropanal undergoes isomerization into the 2-hydroxy-3-alkoxy-3-methyl-1,4-oxathiane that at heating in the presence of catalytic amounts of acids is converted into 2-methyl-2-formyl-1, 3-oxathiolane. The reaction of 2-alkoxypropenals with 2-mercaptoethanol at heating (60degreesC, 3 h) in the presence of acids affords 2-methyl-2,2'-bi(1,3-oxathiolane) even at 2-mercaptoethanol deficit. At the double excess of the latter the 2-methyl-2,2'-bi(1,3-oxathiolane) was obtained in quantitative yield. The presumable schemes of conversion of 2-hydroxy-3-alkoxy-3-methyl-1,4-oxathiane into 2-methyl-2-formyl-1,3-oxathiolane and 2-acetyl-1,3-oxathiolane are discussed.
Photolysis of 4-substituted isoxazolin-5-ones: sulphur-stabilized iminocarbenes
作者:Tadashi Sasaki、Kenji Hayakawa、Sumio Nishida
DOI:10.1039/c39800001054
日期:——
Photolyses of 4-sulphenylated 2,3-dimethylisoxazolin-5-one proceed via iminocarbene intermediates which are trapped with methanol to give pyruvic aldehyde thioacetals.