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Triphosphatrisilacyclohexanes as Tridentate Coronands in Cr and Mo Complexes: Activation of SiH in an Early Stage versus Phosphane Coordination
Author(s) -
Driess Matthias,
Reisgys Michael,
Pritzkow Hans
Publication year - 1992
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199215101
Subject(s) - chemistry , chromium , center (category theory) , ligand (biochemistry) , metal , atom (system on chip) , crystallography , medicinal chemistry , stereochemistry , organic chemistry , biochemistry , receptor , computer science , embedded system
The SiH bond ousts a phosphorus atom in the coordination to the metal center of the chromium complex 1 . This is the surprising result of the reaction of the hexaorganosubstituted P 3 Si 3 ligand 2 with [Cr(CO) 3 ] (• = SiHMes in 1 and 2 ). The Si,H,Cr three‐center two‐electron bond in 1 represents a case of very weak SiH activation. The crucial factor determining the unusual complexation is the mesityl substitution at the tiny metal center. This is confirmed by the formation of complexes 3 , in which Cr is replaced by Mo and/or mesityl by phenyl groups.