C. Baldoli et al., REACTION OF PENTACARBONYL(METHYLPYRROLIDINOCARBENE)CHROMIUM(0) WITH ALDEHYDES - A NEW ENTRY TO ENTACARBONYL(ALKENYLPYRROLIDINOCARBENE)CHROMIUM(0), Synlett, (12), 1993, pp. 935-936
The conjugate base of pentacarbonyl(methylpyrrolidinocarbene)chromium(
0) (1) easily reacts with aldehydes, yielding aldol products (2). The
latter are converted into the corresponding pentacarbonyl(alkenylpyrro
lidinocarbene) complexes with high E selection under very mild conditi
ons.