Patent ID: 6399796
Filing Date: 2002-06-04
Classification: C07J

Abstract:
A Diels-Alder reaction method comprising the steps of:(a) admixing a 5,7-diene sterol, a dienophile and a catalytic amount of an exogenous ethylenically unsaturated C12 to C24 fatty carboxylic acid, wherein the 5,7,-diene sterol has the structural formula: wherein R3 is selected from the group consisting of H and R1COâ€” wherein R1 is monocyclic aryl of 5 to 7 carbon atoms or lower alkyl; R4, R5 and R6 are independently selected from the group consisting of H, hydroxyl, and lower alkyl; and R7 is a 1 to 10 carbon atom hydrocarbyl group; (b) maintaining the admixture for a time sufficient to permit the formation of a Diels-Alder adduct of the 5,7-diene sterol.