Abstract
PhCH 2Re(CO) 5 reacted with 1,4-diaryl-1-azabutadienes to give cyclometallated (η 2-(C,N)-azabutadiene)Re(CO) 4 ( 4) together with the substituted derivatives (η 1-(N)-azabutadiene)(η 2-(C,N)-azabutadiene)Re(CO) 3 ( 6 and 7) The substituted product was shown by NMR and X-ray crystal structure analysis to be an inseparable mixture of isomers differing in the conformation of the η 1-ligand about the N C bond— trans for ( 6) and cis for ( 7). Reaction of the mixture of 6 and 7 from 1,4-diphenyl-1-azabutadiene with phenyl acetylene gave η 5-(1,2,4-triphenyl-1-aza-cyclohexadienyl)Re(CO) 3.
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