No abstract

A mixture of acids, isolated from artificially grown Polyfiorus tzrwulosus Cooke, P. australiensis Wakefield, or Poria COGOS Wolf, difficult to separate, has been shown to contain a doubly unsaturated dihydroxy-monobasic acid,

A number of (3-ketoesters based on cyclopentanone, with and without additional ap'-unsaturation, have been prepared from 9,l O-phenanthraquinone and ethyl or methyl acetoacetate. Reactions of these with ammonia, hydrazine, and substituted hydrazines involve variously attack at the ester, the keto-group, and/or the olefinic group ; ring-opening sometimes occurs, as does new ring-closure. Several novel compounds are described, including a 1,2-diazatriphenyIene which is readily converted into a dibenzocinnolone.

No abstract

The title compound (Ia) undergoes the expected ring expansion to 3.6-diacetyl-4.5-dihydro-2.7-dimethyl-I Hazepine-4-carbonitrile (11) when treated with cyanide ion. When treated with water, (Ia) gives 3,5-diacetyl-4-(2-acetyl-3-oxobutyl)-1,4-dihydro-2,6-dimethylpyridine ( I I I a ) and a rearrangement product, 4-acetyl-2-(1 -acetyl-2-oxopropyl)-2,3-dihydro-5-methylfuran (V). Pyrolysis of the dihydrofuran (V) yields 3,6-bis-(1hydroxyethylidene)oct-4-ene-2,7-dione ( V I ) whereas hydrolysis gives the fulvene, 1.3-diacetyl-5-(1hydroxyethylidene) -2-methylcyclopenta-1.3-dime ( V I I ) , 3-acetylpentane-l,4-dione (IX) and acetylacetone. Proof of structure is presented and a synthesis of compound ( I X ) is described. The tautomerisrn of compound ( I X ) and the mechanism of the rearrangements of compounds (Ia) and ( I I I a ) are discussed.~-CHLOROMETHYL-~ ,4-DIHYDROPYRIDINES bearing ester report some reactions of the 3,5-diacetyldihydropyridine or nitrile substituents in the 3-and 5-positions (Ib-d), (Ia).9 have been rearranged to give other ring systems in-When treated with ethanolic potassium cyanide, cluding azepines, pyrroles, and fulvenes.1-8 We now compound (Ia) gave the expected 3,6-diacetyl-4,5-