Chemical synthesis demonstrates the formation of 1,2-azaboratabenzene ruthenium complexes, highlighting their utility as nucleophilic catalysts in organic acylation reactions.
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-1-trimethylsilyl-1H-1,2-azastannole ( 7 ). Deprotonation of 6a affords 1-phenyl-1,2-azaboratabenzene 1a, 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.
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Pan et al. (2004) studied this question.
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