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Metal-catalyzed hydroboration of alkynes usually proceed in a cis-addition manner.Applications of trans-hydroboration of terminal alkynes via a vinylidene intermediate are limited.trans-hydroboration of internal alkynes were first achieved by using [Cp*Ru(MeCN)3]PF6,as a catalyst1.DFT studies have been carried out to elucidate the reaction mechanism and selectivity.The reaction was suggested to undergo via a hydrogen migration to form a metallacyclopropene intermediate with the preference towards the trans-selectivity,followed by a direct reductive boron migration to furnish trans-product2,3.The HBCat reagent is unreactive due to the strong coordination of the benzene with the catalyst.