Metallorganische Lewis-Säuren: XLIV. Rheniooxy(organyl)carben-Komplexe von Chrom, Molybdän und Wolfram☆

Abstract The addition of the strong organometallic Lewis acid Re(CO) 5 + (as (OC) 5 ReFBF 3 ) to anionic acyl complexes L(OC) 4 MC(R)O − (M  Cr, W; L  CO, PPh 3 ; R  Me, Ph, Fc  ferrocenyl) and to the anions from ethoxy acetylene and the hexacarbonyls of chromium, molybdenum and tungsten gives the title complexes L(OC) 4 MC(R)ORe(CO) 5 ( 1 ) and (OC) 5 M CC(OEt)C ORe(CO) 5 ( 2 ), respectively. The structure of 2a (M  Cr) has been determined by X-ray diffraction.