Isolation of Dithiolanylium Salts and Their Conversion to Ketene Dithioacetals and Ortho Esters
作者:Tadashi Okuyama、Wataru Fujiwara、Takayuki Fueno
DOI:10.1246/bcsj.59.453
日期:1986.2
prepared by the reaction of 1,2-ethanedithiol with acyl chlorides in the presence of perchloric acid. Treatments of 1 with triethylamine gave 2-alkylidene-1,3-dithiolane (2) when the 2-substituent was a primary or secondary alkyl group. 2-Aryl derivatives of 1 were converted to ortho esters by the reaction with methanol in the presence of silver nitrate. 1,3-Dithian-2-ylium perchlorates and 2-alkylidene-1
An ultraviolet absorbent composition, having ultraviolet absorbent A and a silicon compound, in which the ultraviolet absorbent A has a maximum absorption wavelength from 350 nm to 400 nm, a half value width of 55 nm or less, and the molar extinction coefficient of 20000 or more at the maximum absorption wavelength.
一种紫外线吸收剂组合物,包含紫外线吸收剂 A 和硅化合物,其中紫外线吸收剂 A 的最大吸收波长为 350 纳米至 400 纳米,半值宽度为 55 纳米或以下,在最大吸收波长处的摩尔消光系数为 20000 或以上。
Ketene Thioacetals from α-Chloromercaptals
作者:Franco Bellesia、Monica Boni、Franco Ghelfi、Ugo M. Pagnoni
DOI:10.1080/00397919308011176
日期:1993.12
Excellent yields of ketene thioacetals are obtained from 2-(1-chloroalkyl)-1,3-dithiolanes or 2-(1-chloroalkyl)-1,3-dithianes.
Preparation of vinyl alkanedithioates
作者:M. Saquet、A. Thuillier
DOI:10.1016/s0040-4039(00)78987-8
日期:1980.1
SAQUET M.; THUILLIER A., TETRAHEDRON LETT., 1980, 21, NO 22, 2165-2166,