E1cb mechanism is the overwhelming process in the reaction of bases and ozonides. As a quenching agent in the ozonolysis of a variety of alkenes, the reactions involving triethylamine often gave better yields and proceeded faster than those involving methyl sulfide. On the other hand, in the presence of 4 Å molecular sieves, the secondary amines reacted with mono- and 1,1-di-substituted ozonides to afford
A green method for the self-aldol condensation of aldehydes using lysine
作者:Yutaka Watanabe、Kazue Sawada、Minoru Hayashi
DOI:10.1039/b918349c
日期:——
A self-condensation of aldehydes has been conveniently accomplished by the catalytic action of lysine in water or a solvent-free system under specific emulsion conditions to give α-branched α,β-unsaturated aldehydes in good yields.
A general and highly chemo‐, regio‐, and stereoselective synthesis of α,β‐unsaturated aldehydes by a dominohydroformylation/aldol condensation reaction has been developed. A variety of olefins and aromatic aldehydes were efficiently converted into various substituted α,β‐unsaturated aldehydes in good to excellent yields in the presence of a rhodium phosphine/acid–base catalyst system. In view of the
Process for the catalytic production of unsaturated aldehydes
申请人:Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT)
公开号:US09238607B1
公开(公告)日:2016-01-19
The invention concerns a process for the catalytic production of unsaturated aldehydes by reacting an olefin in the presence of carbon monoxide and hydrogen, a rhodium compound and organic phosphorus-containing ligands in an organic solvent as well as a co-catalyst formed from a weak organic acid and an organic amine.