Titanacarborane mediated C–N bond forming/breaking reactions
摘要:
Constrained-geometry titanacarboranes [sigma: eta(1):eta(5)-(OCH2)(R2NCH2)C2B9H9]Ti(NR2) (R = Me, Et) are synthesized via an unexpected reaction of [Me3NH][mu-7,8-CH2OCH2-7,8-C2B9H10] with Ti(NR2)(4) (R = Me, Et), involving a C-O bond cleavage and C-N bond formation. These complexes can be readily converted to new amide species or alkoxide by reacting with amines or esters, respectively. Insertion of a series of unsaturated molecules into the Ti-N bond of the aforementioned complexes results in the formation of various half-sandwich titanacarboranes. [sigma: eta(1): eta(5)-(OCH2)(Me2NCH2)C2B9H9]Ti(NMe2) is also able to efficiently catalyze the hydroamination of carbodiimides and the transamination of guanidines. These results are summarized in this brief account. (C) 2008 Elsevier B.V. All rights reserved.
Titanacarborane mediated C–N bond forming/breaking reactions
作者:Hao Shen、Zuowei Xie
DOI:10.1016/j.jorganchem.2008.11.010
日期:2009.5
Constrained-geometry titanacarboranes [sigma: eta(1):eta(5)-(OCH2)(R2NCH2)C2B9H9]Ti(NR2) (R = Me, Et) are synthesized via an unexpected reaction of [Me3NH][mu-7,8-CH2OCH2-7,8-C2B9H10] with Ti(NR2)(4) (R = Me, Et), involving a C-O bond cleavage and C-N bond formation. These complexes can be readily converted to new amide species or alkoxide by reacting with amines or esters, respectively. Insertion of a series of unsaturated molecules into the Ti-N bond of the aforementioned complexes results in the formation of various half-sandwich titanacarboranes. [sigma: eta(1): eta(5)-(OCH2)(Me2NCH2)C2B9H9]Ti(NMe2) is also able to efficiently catalyze the hydroamination of carbodiimides and the transamination of guanidines. These results are summarized in this brief account. (C) 2008 Elsevier B.V. All rights reserved.