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red silky needles identical with the picrate isolated from the chloranil dehydrogenation.The hydrocarbon regenerated from the pure picrate in ether-benzene-chloroform solution, by selective adsorption on activated alumina, crystallized from methanol in elongated colorless prisms, m. p. 96-97°. A mixture with 4-isopropyl-1,3,6,7-tetramethylnaphthalene (IX) (syn-thetic,8 m. p. 96.5-97°) melted at 96-97°. A mixture with 4-isopropyl-1,2,6,7-tetramethylnaphthalene (X) (from cadinine,8 m. p. 102-103°) melted at 71-74°.