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2005
Carboxylic acid esters
Q 0530
Palladium-Catalyzed Oxidative Carbonylation of 1-Alkynes into 2-Alkynoates
Molecular Oxygen as Oxidant. — The new process converts alkynes into alkyl
11- 102 with
2-alkynoates under atmospheric pressure of CO in the presence of palladium—phosphine catalysts, using molecular oxygen as the sole oxidant in the absence of any other
oxidizing agent. This method provides a simple, inexpensive, and clean catalytic carbonylation process of alkynes with atmospheric oxygen. The oxidative procedure can
be catalyzed not only by homogenous catalysts but also by heterogeneous systems such
as palladium on carbon, albeit at higher pressure of CO and O2. The second part of the
paper is concerned with fundamental studies on the behavior of organopalladium complexes assumed as models of intermediates involved in the catalytic cycle. —
(IZAWA, Y.; SHIMIZU*, I.; YAMAMOTO*, A.; Bull. Chem. Soc. Jpn. 77 (2004) 11,
2033-2045; Dep. Appl. Chem., Sch. Sci. Eng., Waseda Univ., Shinjuku, Tokyo 169,
Japan; Eng.) — H. Hoennerscheid
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