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The azavinylidene osmium complex [OsH(=N=CPh2)(CO)(PiPr 3 ) 2 ] (2) is prepared either from [OsHCl(CO)(PiPr 3 ) 2 ] (1) and MN=CPh 2  (M = Li, Na) or from [OsHCl(NH=CPh 2 )(CO)(PiPr 3 ) 2 ] (3) by HCl elimination with ΚΟ-t-Bu. The IR and NMR spectroscopic data of 2 provide evidence that a linear Os—N—C unit is present. Complex 2 reacts with CH 3 OH to give the isomeric ortho-metallated compound [OsH{NH=C(Ph)C 6 H 4 }(CO)(PiPr 3 ) 2 ] (5). With CD 3 OD instead of CH 3 OH, the mono-deuterated derivative [OsH{ND=C(Ph)C 6 H 4 }(CO)(PiPr 3 ) 2 ] (5-d 1 ) is obtained.

Synthese und Reaktivität eines Azavinyliden(hydrido)osmium-Komplexes / Synthesis and Reactivity of a Azavinylidene(hydrido)osmium Complex