Y. Makioka et al., REACTIVITY OF LANTHANIDE(II) ACETYLIDES G ENERATED FROM LANTHANIDE-BENZOPHENONE COMPLEXES AND 1-ALKYNES, Nippon kagaku kaishi, (4), 1996, pp. 424-426
Ytterbium and samarium-benzophenone complexes react with 1-alkynes to
generate lanthanide(II) acetylides having diphenylmethoxo ligand. It h
as been found that these acetylides act as reductants as well as nucle
ophiles, depending on the electrophiles used. Thus, their reaction wit
h aldehydes and aliphatic ketones gives propargylic alcohols in good y
ields, while, with aromatic ketones and alkyl halide, the reductive co
upling products are obtained selectively.