M. Tamm, F. Hahn
May 2, 1999
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0
Influential Citations
19
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract The reaction of 2-trimethylsiloxyphenyl isocyanide ( 1 ) with [M(CO) 5 (THF)] (M=Cr, W) gives the complexes [M(2-Me 3 SiO–C 6 H 4 NC)(CO) 5 ] ( 2 ) ( 2a , M=Cr; 2b , M=W). Hydrolysis of the Si–O bond leads to the formation of an equilibrium between complexes 3 ( 3a , M=Cr; 3b , M=W) with a 2-hydroxyphenyl isocyanide and complexes 4 ( 4a , M=Cr; 4b , M=W) with a 2,3-dihydrobenzoxazol-2-ylidene ligand. Deprotonation of mixtures 3 / 4 followed by alkylation with allyl bromide yields exclusively N -allyl-2,3-dihydrobenzoxazol-2-ylidene complexes ( 5 ) ( 5a , M=Cr; 5b , M=W). Thermally induced intramolecular substitution of one cis -carbonyl ligand in ( N -allyl-2,3-dihydrobenzoxazol-2-ylidene)-pentacarbonyltungsten ( 5b ) results in the formation of the alkene–carbene complex 6 incorporating an η 2 :η 1 -( N -allyl-2,3-dihydrobenzoxazol-2-ylidene) ligand. The molecular structure of 5b is reported.