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This work describes a new atom-economical catalytic process for the guanylation of amines with a broad substrate scope using the half-sandwich titanacarborane amide σ:η 1:η 5 -(OCH 2 )(Me 2 NCH 2 )(C 2 B 9 H 9 )Ti(NMe 2 ) as catalyst. This species bears two different sidearms: one is strongly bonded to the Ti center by taking the advantage of its high oxophilicity, whereas the other is hemilabile in nature, binding the Ti center reversibly.
Shen et al. (Sat,) studied this question.