Rationale for Predominance of 1,3-Dipolar Cycloreversion in Thermolysis of 3,4-Dihydropyrazole from Ethano-bridged Diphenyldiazomethane and 2,5-Dimethyl-1,4-benzoquinone. An X-Ray Study

DOI: 10.1039/c39950001937

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Journal of the Chemical Society. Chemical communications p. 1937 - 1938 (1995)

Update date:2022-07-30

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Authors:

Oshima, Takumi

Kawamoto, Tatsuya

Kuma, Hiro

Kushi, Yoshihiko

Nagai, Toshikazu

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Article abstract of DOI:10.1039/c39950001937

The X-ray crystal structure of the title dihydropyrazole indicates that the steric and ?-conjugative effects associated with the conformational locking of the two phenyl rings are the crucial factors in the predominance of 1,3-dipolar cycloreversion rather than nitrogen extrusion to give the cyclopropane derivative.

Full text of DOI:10.1039/c39950001937

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