This paper described an extension of the authors' method for direct enthalpimetric determination of olefins to six compounds containing allylic or vinylic unsaturation. Solutions of allylbenzene, allylcyclohexane, allylcyclopentane, methallylbenzene, vinylcyclohexane and vinylcyclopentane in concentrations of 26.4–184μmol have been analyzed with a standard deviation of 1 to 3 %. Under the conditions described, allylic and vinylic unsaturation in these compounds can be determined in the presence of aromatic unsaturation with no interference. Preliminary results for two compounds for which the enthalpimetric method is unsuccessful or at least suspect, allyl acetate and styrene, are also report