Aza- versus Phospha-Substitution in Cycl
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Prof. Dr. Wolfgang W. Schoeller; Thilo Busch
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Article
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1993
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John Wiley and Sons
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English
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Completely different effects on the stability of cyclobutadiene are found upon replacement of C with N or P. Whereas in the phospha derivatives the cyclobutadiene structure is less stable than the tetrahedrane, and the barrier to valence isomerization is reduced, the exchange of N for C increases th