ZUR REAKTION VON METALL-KOORDINIERTEM KOHLENMONOXID MIT YLIDEN. XVI. REVERSIBLER EINBAU VON KOHLENMONOXID IN EINE TRIMETHYLPHOSPHONIO(TRIMETHYLSILOXY)VINYL-EINHEIT: DARSTELLUNG DES ZWITTERIONISCHEN VINYL-CHROMKOMPLEXES Cp(CO)(NO)Cr-C(OSiMe3) = CH-PMe3 UND SOLVOLYTISCHER ABBAU, SOWIE ...

Article abstract of DOI:10.1016/0022-328X(84)85085-8

The β-trimethylphosphonio (α-trimethylsiloxy)vinylchromium complex Cp(CO)(NO)Cr-C(OSiMe3) = CH-PMe3 (2) can be isolated from a concentrated solution of Cp(CO)2(NO)Cr (1) and Me3P=CHSiMe3 in benzene. 2 is obtained in better yield via O-silylation of the tetramethylphosphonium chromium acylate Me4P (3) with Me3SiOSO2CF3. 2 decomposes readily by treatment with benzene to 1 and Me3P=CHSiMe3, which forms the ylide complex Cp(CO)(NO)Cr-CH(SiMe3)-PMe3 (4) on photolysis.Degradation of 2 can be accelerated extraordinarily by traces of Me3P=CH2.With Me3P=CH2 (2 mol) controlled conversion of 2 to 3 and Me3P=CHSiMe3 occurs.MeX (X = I, SO3F) cleaves 2 to 1 and the phosphonium salt X (5a, 5b).