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Pd(II)—dppb and syngas catalyze regioselective hydroesterification of terminal alkynes under neutral conditions

✍ Scribed by Bassam El Ali; Jimoh Tijani; Abdel Moneim El-Ghanam

Publisher
Elsevier Science
Year
2001
Tongue
French
Weight
63 KB
Volume
42
Category
Article
ISSN
0040-4039

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✦ Synopsis

Palladium(II) regioselectively catalyzes the hydroesterification of terminal alkynes under syngas forming a,b-unsaturated esters 3 and 4 in excellent chemical yields under neutral conditions. The high selectivity for the linear ester 4 was obtained with a catalytic system that includes Pd(II), 1,4-bis(diphenylphosphino)butane (dppb) and CO/H 2 in CH 2 Cl 2 as solvent. The control of the regioselectivity depends strongly upon the type of ligand, the solvent and the use of the syngas mixture.

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