Catalytic Transformations of Vinylthiiranes by Tungsten Carbonyl Complexes. A New Route to 3,6-Dihydro-1,2-dithiins
作者:Richard D. Adams、Joseph L. Perrin
DOI:10.1021/ja984249g
日期:1999.4.1
catalyst also leads to significant increases in the rate of reaction. The dithiin complex W(CO)sub 5}(ovr SSCHsub 2}CHdouble_bond}CHC}Hsub 2}) was isolated from the catalytic reactions and was structurally characterized. The dihydrodithiin is coordinated to the tungsten atom through one of its two sulfur atoms. This product was shown to be a species in the catalytic cycle. A mechanism involving a vinylthiirane
已发现 W(CO)sub 5}(NCMe) 可将乙烯基硫杂环丙烷和一系列甲基取代的乙烯基硫杂环丙烷转化为一系列 3,6-二氢-1,2-二硫杂环丙烷化合物。需要两当量的乙烯基硫杂环丁烷,1 当量的丁二烯通过将其硫原子转移到第二个乙烯基硫杂环丁烷而形成,然后将其转化为二氢二硫杂环丁烷。使用乙烯基硫杂环丙烷作为催化剂,在 25°C 下以 15 转/小时的速度形成 3,6-二氢-1,2-二硫辛。该催化剂寿命长(在不损失活性的情况下已获得高达 2,000 次转换)并且对空气相对不敏感。乙烯基上的甲基取代基提高了反应速度,而硫杂环上的甲基取代基则大大减慢了反应速度。将膦配体引入催化剂也导致反应速率的显着增加。二噻英复合物 W(CO)sub 5}(ovr SSCHsub 2}CHdouble_bond}CHC}Hsub 2}) 从催化反应中分离出来并进行了结构表征。二氢二噻英通过其两个硫原子