On the regioselectivity of palladium catalyzed cross-coupling reactions of alkenylsilanes: Participation of β-cationic organosilicate-palladium species during the transmetallation
作者:Yasuo Hatanaka、Ken-ichi Goda、Tamejiro Hiyama
DOI:10.1016/0022-328x(94)87042-x
日期:1994.2
iodides gave the unexpected cine-substitution products (E)-1-aryl-2-phenylethenes (3) along with the normal ipso-substitution product 1-aryl-1-phenylethene (2). The product ratios were strongly dependent on the electronic nature of the substituent on aryl iodides: ipso-substitution products (2) were favoured by an electron-withdrawing substituent, and cine-substitution products (3) by an electron-donating
Alkenyltrifluorosilanes are readily oxidized by one equivalent of MCPBA in DMF even at −50°C to give the corresponding carbonyl compounds via cleavage of the carbonsilicon bond. With three equivalent of MCPBA a concomitant cleavage of the carboncarbon bond occurs. A plausible mechanism of these new types of oxidation has been discussed. Oxidation with DABCO · 2H2O2 has also been described.
烯基三氟硅烷很容易在DMF中被一当量的MCPBA氧化,即使在-50°C下也可以通过碳-硅键的断裂得到相应的羰基化合物。在三当量的MCPBA的作用下,碳碳键随之断裂。已经讨论了这些新型氧化的合理机理。还描述了用DABCO·2H 2 O 2氧化。
Ikenaga, Kazutoshi; Kikukawa, Kiyoshi; Matsuda, Tsutomu, Journal of the Chemical Society. Perkin transactions I, 1986, p. 1959 - 1964