Abstract
The carbene- C, N chelate tetracarbonyl tungsten complex [(CO) 4 WC(Ph)NHC 5H 4N - o] ( 4), obtained from [(CO) 5WC(Ph)OMe] ( 3) and o-aminopyridine, reacts with iodine by oxidative decarbonylation to give a single isomer of the carbene- C, N chelate tricarbonyl dihalogeno tungsten(II) complex [(CO) 3I 2W C(Ph)NHC 5H 4N - o] ( 5). The analogous reaction of 4 with bromine affords two interconverting isomers of [(CO) 3Br 2 WC(Ph) NHC 5H 4N - o] ( 6). The oxidative decarbonylation of the carbene- C, O chelate tetracarbonyl tungsten complex [(CO) 4 WC(OMe)C 6H 4O Me- o] ( 1) with tetrachloro- o-benzochinone yields the first carbene- C, O chelate tricarbonyl- o-benzochinone tungsten(II) complex 8. The structures of 5 and of [(CO) 4I 2 WC(OMe)C 6H 4O Me- o] ( 2c) were established by X-ray structural analyses.
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