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■ Synthesis and Properties of Norcaradiene-Cycloheptatriene System Fused with Isoxazole Ring

Nobuhiro Kanomata, Makoto Nitta, Kensuke Takahashi, Yutaka Takakura, and Katsuhiro Saito

*Department of Chemistry, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan

Abstract

Novel norcaradiene-cycloheptatriene systems fused with arylisoxazoles were synthesized and their temperature dependent ¹H nmr spectra were studied. while the fusion of isoxazole ring much shifted the norcaradiene-cycloheptatriene equilibrium to the side of norcaradiene form, the rapid isomerizations of the norcaradienes with their enantiomers were observed and their δG‡_c values were obtained.