1,2-Azaboratabenzene: A Heterocyclic π-Ligand with an Adjustable Basicity at Nitrogen
摘要:
1,2-Dihydro-2-phenyl-1,2-azaborine (6a) has been prepared by a multistep synthesis from the readily available 2,2-dibutyl-2,5-dihydro-l-trimethylsilyl-1H-1,2-azastannole (7). Deprotonation of 6a affords 1-phenyl-1,2-azaboratabenzene la, which on reaction with [Cp*RuCl](4) gives the sandwich compound 5.5 has been shown to function as a nucleophilic catalyst for the acylation of benzyl alcohol by phenylethylketene.