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moved and the residual viscous red oil treated with 5 cc. of boiling petroleum ether (b. p. 60-110"). The insoluble dark gum was removed from the solution by decantation of the latter. On cooling, the petroleum ether deposited an orange-colored solid which weighed 235 mg. By concentrating the mother liquors, carefully discarding the red gum which formed regularly, another 540 mg. of this solid was obtained. The total yield was 775 mg. (26%). A sample was recrystallized from petroleum ether (Darco) to constant melting point; tiny needles, m. p. 146' (cor.). Anal. Calcd. for C~lH2604: C, 72.88; H, 7.89. Found: C, 73.55; H, 7.82.l-Hydroxy-J-n-amyl-9-rnethyl-6-dibenzopyrone.-A mixture of 235 mg. of 2,6-dimethoxy-4-n-amyl-5'-methyl-2'-carboxybiphenyl, 0.6 cc. of 48% hydrobromic acid, 1 cc. of glacial acetic acid, and 0.5 cc. of acetic anhydride was heated to reflux to dissolve the solid acid, and heating continued for four hours. After pouring into 20 cc. of water, the reaction mixture was extracted three times with ether and the organic layer washed thoroughly with saturated aqueous sodium bicarbonate and dried over magnesium sulfate. The solvent was removed and the oily residue was treated with boiling petroleum ether (b. p.

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Nitroso Derivative of the Urethan.-This was prepared by passing dry nitrous anhydride into a suspension of the urethan in ether at -20°for two hours. After standing for thirty minutes the excess gas was removed and the solution poured into water. The nitroso derivative separated and was recrystallized from alcohol; m. p. 87-89°( dec.). An alcoholic solution containing 0.1631 g. in 25 cc. gave in a 2-dm. tube ao +0.12°, [a]25o +9.2°. Anal.