Crystal structure and photoreactive behaviour of ,-diisoprop-yl(-phenyl-phen-yl)glyoxyl-amide.

The title compound [systematic name: 2-([1,1'-biphen-yl]-4-yl)-2-oxo-,-bis(propan-2-yl)acetamide], CHNO was synthesized and its photoreactive properties in the crystalline state and in aceto-nitrile solution were investigated. The compound crystallizes in the chiral space group 222. The crystal does not react under UV light irradiation, perhaps due to the presence of the biphenyl group.

Crystal structure of -isopropyl--(phen-yl)phenyl-glyoxyl-amide.

The title compound [systematic name: 2-oxo-,2-diphenyl--(propan-2-yl)acetamide], CHNO, was synthesized and its photoreactive properties in the crystalline state were investigated. In the mol-ecule, the carbonyl group attached to the phenyl ring adopts an - configuration with respect to the isopropyl group. Moreover, the distance between the C atom of the carbonyl group and the N-bound C atom of the isopropyl group is 3.

Enantioselective Photochemical Reactions of N-Phenyl Enaminones in Inclusion Complex Crystals Using a Chiral Host Compound.

Enantioselective reaction of N-methyl-N-phenyl-3-amino-2-cyclohexen-1-one derivatives to the corresponding N-methylhexahydro-4-carbazolones has been accomplished by photolysis in a water suspension of 1:1 inclusion compounds of the starting material with optically active host compounds derived from tartaric acid. 3-(N-Methylanilino)-2,5,5-trimethyl-2-cyclohexen-1-one formed two kinds of dimorphous crystals, and one of these gave an optically active carbazolone derivative by photolysis, but the other one was photochemically inert. X-ray structure analysis showed that two reaction centers, the phenyl and cyclohexenone groups of the reactant, are located in close and distant positions respectively in these two inclusion compounds.

Enantioselective Photocyclization of N-Alkylfuran-2-carboxyanilides to trans-Dihydrofuran Derivatives in Inclusion Crystals with Optically Active Host Compounds Derived from Tartaric Acid.

The steric course of the photocyclization reaction of the title achiral compounds (1) to optically active trans-dihydrofuran derivatives (2) was controlled by carrying out the reaction in inclusion crystals (4) with optically active hosts (3) derived from tartaric acid. The mechanism of the enantioselective reaction of 1 in 4 was studied by X-ray structural analysis of 4. In some cases, the steric course of the photoreaction was different depending on whether 4 was prepared by recrystallization or by mixing of 1 and 3.