| 초록 |
Thermal reaction of trichlorosilane (1a) with cycloalkene such as cyclopentene (2a), cyclohexene (2b), cycloheptene (2c), and cyclooctene (2d) at 250 oCfor 6 hgave the corresponding hydrosilylation products in excellent yields (97-98%), but the similar reactions using methyldichlorosilane (1b) instead of 1a required a longer reaction time of 40 h and afforded cycloalkyl(methyl)dichlorosilanes [CnH2n-1SiMeCl2: n=5-8] in 88-92% yields with 4-8% recovery of reactant 2. The relative reactivity of four hydrosilanes [HSiCl3-mMem: m = 0-3] in the reaction with 2a indicates that as the number of chlorine-substituent(s) on the silicon increases the rate of the reaction decreases in the following order: n = 3 ＞ 2 ＞ 1 ＞＞ 0. In the reaction with 1a, the relative reactivity of four cycloalkenes (ring size=5-8) decreases in the following order: 2d ＞ 2a ＞ 2c ＞ 2b. In thisseminar, Iwill present the hydrosilylation of olefin with hydrosilane indetails and their reaction mechanism. |
