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2) A mixture of isomeric branched hexanes.

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Notes stereochemistry of the heterocyclic derivatives at C-2 to be the same as the corresponding ketone, the hydrazines could have isomerized the methyl moiety during the condensation reaction. Use of semicarbazone or thiosemicarbazone resulted also in pyrazoles. All of the pyrazoles IIIa,c,d,f and VI exhibited uv maxima at 225-227 µ, which shifted to 231-235 µ in acidified alcohol. The phenylpyrazoles IIIb,e had a maximum at 253 µ, which was not affected by acidification. No attempt was made to ascertain the exact location of the phenyl ring.The pyrimidines IV were best prepared by melting an intimate mixture of the 1,3-diketones and guanidine carbonate or thiourea. Use of the standard baseor acid-catalyzed condensation conditions resulted only in the destruction or the recovery of diketone. The aminopyrimidines had double maxima of 230 and 303 µ, which could be shifted by acid to 226 and 312 µ, respectively. Thiourea product IVb had peaks at 233 and 286 µ.

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