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Vol. 72 5530 and 5 g . of 2-phenyl-A~-cyclohexenone. The flask was itoppered and the mixture was swirled until it became homogeneous. After forty hours at room temperature the mixture was treated with 2 ml. of acetic acid and 25 ml. of water and the aqueous layer ma5 extracted with ether. The product was separated from the excess nialonic ester by fractional distillation; yield, 5.7-6.4 g.; b. p. 180-185" ,it 0.1 mm. The trans-diethyl 3-oxo-2-phenylcyclohexariemalonate (11) was analyzed in the form of its semicarbazone, which crystallized from methanol in small colorles? rhombs; m. p. 154-155".Anal. Calcd. for C20H2,SJ05. C, 61.7; 11, 6.9.Found: C, 61.8; R, 6.7, trans4 -Oxo-2

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components containing a benzohydroquinone nucleus, although such substances are less reactive than the compounds of the naphthalene series and the yields are lower. 5,8-Dihydrovitamin Ki and 2,3,5-trimethyl-6-phytyl-l,4-benzoquinone have been prepared by the standard synthesis and the latter substance has been utilized in a new synthesis of a-tocopherol.

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