Migration of alkyl group from O to S in the reaction of O, S-dialkyl dithiocarbonates with boron trifluoride etherate was studied to elucidate the reaction mechanism on the basis of results from kinetics, crossover reaction, and products formed. It was worthy of note that dialkyl methyl sulfonium fluoroborates were formed in a fairly good yield in reactions with O-alkyl S-methyl dithiocarbonates (alkyl=benzyl and cholesteryl) with boron trifiuoride etherate. Formation mechanism of these by-products was investigated and discussed.
研究了 O、S-二烷基二
硫代
碳酸酯与
三氟化硼醚反应中烷基从 O 向 S 的迁移,并根据动力学、交叉反应和生成物的结果阐明了反应机理。值得注意的是,在 O-烷基 S-甲基二
硫代
碳酸酯(烷基=苄基和胆甾基)与
三氟化硼醚酸盐的反应中,生成的二烷基甲基
氟硼酸锍的产率相当高。对这些副产品的形成机理进行了研究和讨论。