Alkynylation of chlorosilanes with copper(I) alkynides takes place smoothly in the presence of triphenylphosphine, N, N, N′, N′-tetramethylethylenediamine, or zinc powder to give a variety of alkynylsilanes in good yields.
Treatment of phosphine–boranes with molecular sieves 4Å in a mixture of an ethereal solvent and an alcohol provided deprotected free phosphines in quantitative yields. The phosphines can be obtained by a simple filtration/crystallization procedure in most cases. It should be noted that the current method is successfully applied to the deprotection of a phosphite–borane for the first time.
Silylation of aryl bromides with disilanes of type [{2-(PGOCH2)C6H4}Me2Si]2 (PG: protecting group) successfully takes place in the presence of a Pd/Ruphos or Davephos/CuI catalytic system to give HOMSi reagents containing various functional groups in good yields. BisHOMSi reagents also were prepared directly from the corresponding arylene dibromides.