Reaction of [(CO)5Cr=B=N(SiMe3)2] with isocyanides led to the formation of boron-containing cyclic (amino)(imino)carbene complexes (1  ) and involves a novel [2+1] cycloaddition pathway. An alternative reactivity was observed with our more recently developed, and sterically encumbered, aryl borylene complex [(CO)5Cr=B�Ar'] (Ar' = C6H3-2,6-(C6H2-2,4,6-iPr3)2), which gave 2  upon reaction with 2,6-diisopropylisocyanide (DippNC). This compound can be regarded as the parent aryl borylene (Ar'�B:) stabilized by neutral ligands and features a relatively strong B�CO bond (IR = 1932 cm-1).

Reactivity of terminal borylene complexes towards isocyanides

245th National Meeting (2013)

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