Heterometallic metal carbonyl compounds derived from (η6-arene)tricarbonylchromium bearing propargyl units

Abstract

The compounds [Co₂(CO)₈] and [Mo₂Cp₂(CO)₄] readily react with (η⁶-arene)tricarbonylchromium complexes containing propargyl (prop-2-ynyl) 1a–c units to give new heterotrimetallic complexes [Cr{(η⁶-C₆H₅CCC(H)(R)Y)Co₂(CO)₆}(CO)₃] (2a, R = Me and Y = NMe₂; 2b, R = H and Y = NMe₂; 2c, R = H and Y = OH) and [Cr{(η⁶-C₆H₅CCCH₂NMe₂)Mo₂(Cp)₂(CO)₄}(CO)₃] 3 in moderate to good yield (51–80%). Compounds 2a and 3 have been characterised by X-ray crystallography. Structural data reveal that the Cr(CO)₃ unit adopts a nearly staggered conformation in 2a and eclipsed in 3.