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Paper | Regular issue | Vol 71, No. 9, 2007, pp.1991-2001
Published online, 5th June, 2007
DOI: 10.3987/COM-07-11090
Properties of the Keto Amides Formed by Aminolysis of 3,7-Diarylpyrano[4,3-c]pyran-1,5-dione Derivatives: A Solid-State Reaction, Crystal Structures, and Thermal Analysis

Chika Kawabe, Keitaro Kawakita, Masanori Morinaga, Mitsuru Kondo, and Hajime Irikawa*

*Department of Chemistry, Faculty of Science, Shizuoka University, Ohya 836, Surugaku, Shizuoka 422-8529, Japan

Abstract

Aminolysis of 3,7-diarylpyrano[4,3-c]pyran-1,5-dione derivatives gave keto amides, which upon heating returned back to the original compounds in the solid state. X-Ray crystallographic analysis of the keto amides showed proximate orientations of the ketone and the amide groups. TGA and DTA of the keto amides clarified a kind of solid-state reaction which occurred in appearance without melting, but microscopically proceeded via melting of the keto amides, structural change, and crystallization of the products.