Studies in the heterophanes field [9]het
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A. Marchesini; S. Bradamante; R. Fusco; G. Pagani
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Article
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1971
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Elsevier Science
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French
β 204 KB
Certain methylene(s) in some l,+hridged five~embered heteroaromatics l-3 have been found to be considerably shielded by the n electron cloud, but the effect is much weaker in a number of l,+bridged six-membered aromatics. 4-6 Observation of strong shielding effects in heterophanes appears to be de