A series of diarylphosphinyl-substituted acetylenes of the type (aryl) 2P− C C− R (aryl= phenyl or mesityl, R= Ph or n-propyl) react with the strongly Lewis acid reagent B (C6F5) 3 in toluene at elevated temperatures (70− 105° C) to give the 1, 1-carboboration products 4. Treatment of bis (diphenylphosphinyl) acetylene with B (C6F5) 3 under analogous conditions proceeded with phosphinyl migration to yield the 1, 1-carboboration product 4d ...
