アルキルテルペニルマレエートと各種ジエンとのDiels-Alder付加体

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The adducts were obtained from various dienes and alkyl isobornyl maleates (2) in high yields. These adducts containing terpenyl groups were thought to be valuable as intermediates for anionic or nonionic surfactants. Diels-Alder reactions of various dienes [1, 3-butadiene (1), isoprene (4), cyclopentadiene (6), 1, 3-p-menthadiene (8), alloocimene (10)] with these maleates (2) were carried out in an autoclave or by refluxing. Addition reactions of (2) with (1), (4), (6), (8), (10) yielded a cyclohexa-4-ene-1, 2-dicarboxylic acid alkyl-isobornyl-ester (3), 4-methyl-cyclohexa-4-ene-1, 2-dicarboxylic acid-alkyl-isobornyl-ester (5), bicyclo [2.2.1] -hept-5-ene-2, 3-dicar-boxylic acid-alkyl-isobornyl-ester (7) and 1-isopropyl-4-methylbicyclo [2.2.2] -oct-5-ene-2, 3-dicarboxylic acid-alkyl-isobornyl-ester (11), respectively. (alkyl; ethyl, n-butyl, 2-ethyl-hexyl)
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