Summary 1. Pseudocumohydroquinone, when condensed with crotyl alcohol or with butadiene, forms trimethylcrotylhydroq uinone. 2. Pseudocumohydroquinone, when condensed with crotyl chloride or methylvinylcarbinyl chloride, forms 2-ethyl-4, G, 7-trimethyl- 5-hydroxycou-maran. 3. Pseudocumohydroyuinone, when condensed with crotyl bromide, forms a mixture which COIF sists largely of the above coumaran, but which contains also ...