Abstract
Ytterbium and samarium-benzophenone complexes react with 1-alkynes to generate lanthanide. (II)acetylides having diphenylmethoxo ligand. It has been found that these acetylides act as reductants as well as nucleophiles, depending on the electrophiles used. Thus, their reaction with aldehydes and aliphatic ketones gives propargylic alcohols in good yields, while, with aromatic ketones and alkyl halide, the reductive coupling products are obtained selectively.
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