Development of a new sterically protecting auxiliary of the metacyclophane type and application to unsymmetrical diphosphene, 1,3-diphosphaallene, and 1,4-diphosphabutatriene

Literature Information

Publication Date 2002-11-15
DOI 10.1039/B209666H
Impact Factor 6.222
Authors

Kozo Toyota, Akitake Nakamura, Masaaki Yoshifuji


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Abstract

A new bulky bromobenzene of the metacyclophane type was converted to an unsymmetrically substituted 1,4-diphosphabutatriene whose spin–spin coupling constant (3JPP) turned out to be larger, for the first time, than the 2JPP value of the corresponding 1,3-diphosphaallene.

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