The present invention has its object to provide a curable composition which comprises a reactive silyl group-containing organic polymer, does not contain, as a silanol condensation catalyst, any organotin type curing catalyst currently of concern because of the toxic feature thereof, is excellent in surface curability and depth curability and, further, can provide cured products excellent in adhesiveness; the above obj ect can be achieved by a curable composition which comprises: an organic polymer (A) containing a silicon-containing group capable of crosslinking under siloxane bond formation; and a guanidine compound (B-1), as a silanol condensation catalyst (B), represented by the general formula (1):
R1N=C(NR12)2 (1)
(wherein one of the five R1s is an aryl group and the other four R1s each independently is a hydrogen atom or a hydrocarbon group in which the carbon atom at position 1 is saturated).
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.