Well-defined imidotitanium alkyl cations: agostic interactions, migratory insertion vs.[2+2] cycloaddition, and the first structurally authenticated AlMe3 adduct of any transition metal alkyl cation
Literature Information
Paul D. Bolton, Eric Clot, Andrew R. Cowley, Philip Mountford
The imidotitanium alkyl cations [Ti(NtBu)(Me3[9]aneN3)R]+ (R = Me (3+) or CH2SiMe3 (4+)) possess either a very weak α-agostic or β-Si–C agostic interactions, respectively, according to 13C and 29Si NMR and DFT studies; reaction of 4+ with iPrNCNiPr gives totally selective insertion into the Ti–alkyl bond; reaction of 3+ with AlMe3 gives the first structurally characterised AlMe3 adduct of a transition metal alkyl cation (Me3[9]aneN3 = 1,4,7-trimethyltriazacyclononane).
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