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Alkylvanadium‐ und Alkylniobium‐Reagentien, II. Niobium‐induzierte reduktive Carbonyldimerisierung
Author(s) -
Kauffmann Thomas,
Kallweit Harry
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921250124
Subject(s) - chemistry , reagent , methyllithium , niobium , medicinal chemistry , bicyclic molecule , potassium , organic chemistry
Alkylvanadium and Alkylniobium Reagents, II. — Niobium‐Induced Reductive Carbonyl Dimerisation NbCl 5 reacts with one equivalent of methyllithium or metallic potassium to give a reagent for the transformation of aldehydes, ketones, benzalchloride, and benzotrichloride to symmetrically substituted ethene derivatives (Tab. 1). The reagent NbCl 5 /K ( 2 ) is distinctly more reactive than NbCl 5 /MeLi ( 1 ). For the reductive carbonyl dimerisation with niobium reagents a mechanism is proposed.