Collect. Czech. Chem. Commun. 1985, 50, 2665-2669

Effect of reaction conditions on the activity of the WCl6 + (CH3)4Sn catalytic system in the metathesis of methyl 10-undecenoate

Hynek Balcar, Alena Dosedlová, Lidmila Petrusová and Bohumír Matyska

The J. Heyrovský Institute of Physical Chemistry and Electrochemistry, Czechoslovak Academy of Sciences, 121 38 Prague 2


In contrast to published data, metathesis of methyl 10-undecenoate is found to proceed with a good yield even if the ester is present in a high excess with respect to the catalyst, if the former is first reacted with WCl6 to form a complex (owing to which the reaction mixture acquires red colour), and only then the metathesis is started by adding (CH3)4Sn. Moreover, satisfactory degrees of conversion are only attained if the catalyst concentration is low enough so that the deactivation of the active centres is slowed down.