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

The addition of the strong organometallic Lewis acid Re(CO)5+ (as (OC)5ReFBF3) to anionic acyl complexes L(OC)4MC(R)O− (M  Cr, W; L  CO, PPh3; 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)4MC(R)ORe(CO)5 (1) and (OC)5MCC(OEt)CORe(CO)5 (2), respectively. The structure of 2a (M  Cr) has been determined by X-ray diffraction.