Regular Issue

Vol. 22, No. 11, 1984

35 data found. 31 - 35 listedFirst Previous
Report | Regular issue | Vol 22, No. 11, 1984, pp. 2581 - 2585
Published online:
DOI: 10.3987/R-1984-11-2581
■ The Facile Synthesis of Quinoxalinyl-2-oxyphenols

Gozyo Sakata,* Kenzi Makino, and Isao Hashida

*Central Research Institute, Nissan Chemical Industries Ltd., 722-1 Tsuboicho, Funabashi, Chiba 274-8507, Japan

Abstract

Facile synthesis of quinoxalinyl-2-oxyphenols are described. The condensation of 2-chloroquinoxalines with three molar equivalent of dihydroxybenzene in basic medium gave preferentially quinoxalinyl-2-oxyphenols, which involves nucleophilic cleavage of the initially formed bis(quinoxalinyl-2-oxy)benzenes by an excess of dihydroxybenzene.

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Report | Regular issue | Vol 22, No. 11, 1984, pp. 2587 - 2590
Published online:
DOI: 10.3987/R-1984-11-2587
■ Reactions of Azomethines and Carbon Suboxide

Leonardo Bonsignore,* Salvatore Cabiddu, Giuseppe Loy, and Mario Secci

*Istituto di Chimica Farmaceutica e Tosshicologica, Università di Catania, Viale A. Doria 6, I-95125 Catania, Italy

Abstract

Some reactions with azomethines and carbon suboxide are re-examined. The results show that working with very diluted and no acid diethyl ether solutions a mixture of 1,5-benzoxazocines and 2-oxo-2H-1-benzopyran-3-carboxamides is obtained.

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Report | Regular issue | Vol 22, No. 11, 1984, pp. 2591 - 2594
Published online:
DOI: 10.3987/R-1984-11-2591
■ The Tautomerism of Pyrimidine-2(1H)-one, -Thione and -N-Phenylimine in the 1H- and 13C-NMR

Choji Kashima,* Akira Katoh, Masao Shimizu, and Yoshimori Omote

*Department of Chemistry, University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba-shi, Ibaraki, 305-8571, Japan

Abstract

By the 1H- and 13C-NMR spectral measurement, the structures of the predominant tautomers of 4,6-dimethylpyrimidine-2(1H)-one and -thione were regarded to be the lactam form, while the 2-anilino-4,6-dimethylpyrimidine was the main tautomer. Also, the prototropic interconversion between the tautomers was discussed.

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Report | Regular issue | Vol 22, No. 11, 1984, pp. 2595 - 2599
Published online:
DOI: 10.3987/R-1984-11-2595
■ Unambiguous Synthesis of 9-Cyanamino-acridine and 10-Cyano-9-imino-acridane

Joachim G. Schantl* and Wolfgang Türk

*Institut für Organische und Pharmazeutisch Chemie, Universität Innsbruck, Innrain 52, A-6020 Innsbruck , Austria

Abstract

The reaction of cyanogen bromide with 9-amino-acridine 1 affords 10-cyano-9-imino-acridane 2; the isomeric 9-cyanamino-acridine 3 is formed from 9-methoxy-acridine 6 with cyanamide.

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Review | Regular issue | Vol 22, No. 11, 1984, pp. 2601 - 2655
Published online:
DOI: 10.3987/R-1984-11-2601
■ Infrared Carbonyl Frequencies of Thiolactones and Lactones

J. Hodge Markgraf*

*Department of Chemistry, Williams College, 47 Lab Campus Drive, Williamstown, MA 01267, U.S.A.

Abstract

Infrared carbonyl frequencies of thiolactones and the carresponding lactones are tabulated according to ring size, substituents, unsaturation, heteroatoms, and solvent effects.

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