Abstract
The vanadyl porphyrins from Boscan oil (Cretaceous, W. Venezuela) were isolated as 3 fractions, and degraded to maleimides (1 H-pyrrole-2,5-diones) by chromic acid. Analysis of the products by GC-MS, using multiple ion detection to enhance sensitivity, revealed a major homologous series of 3-Me components with n-alkyl side chains extending to C 11, and a minor series with branched alkyl side chains, the Me branch being at C-1. The origin of the extended alkyl groups is discussed.
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