作者:W. Uhlig
DOI:10.1016/0022-328x(93)83168-u
日期:1993.6
valuable reagents in organosilicon chemistry. New difunctional silyl triflates, R2SiX(OTf) (X CH2CHCH2, CH2CH, OCH3; OTf OSO2CF3) have been prepared by substitution of allyl or phenyl groups at silicon by the trifluormethanesulfonyl group. The presence of the electron-withdrawing triflate group leads to a strong deactivation of the other substituents at the silicon atom, and therefore the displacement
高反应性的甲硅烷基三氟甲磺酸酯是有机硅化学中有价值的试剂。通过用三氟甲烷磺酰基取代硅上的烯丙基或苯基,制备了新的双官能甲硅烷基三氟甲磺酸酯R 2 SiX(OTf)(X = CH 2 = CHCH 2,CH 2 = CH ,OCH 3; OTf = OSO 2 CF 3)。团体。吸电子三氟甲磺酸酯基团的存在导致硅原子上其他取代基的强烈失活,因此第二基团的置换比第一步慢得多。由于这个原因,已经发现在硅原子上的逐步取代。SiY键断裂的反应速率按(Y)CH的顺序降低2 CHCH 2 ⪢C 6 ħ 5 ⪢CH 2 CH,CHC,OCH 3 ⪢CH 3。