Recherches dans la série des cyclitols XXXVIII Etudes conformationnelles de dérivés cyclopenténiques disubstitués‐3, 5

Abstract

Abstract Cyclopentenones substituted in position 4, and 3, 5‐ cis or ‐ trans disubstituted cyclopentenes have been studied by NMR. and by IR. spectroscopy. Cyclopentenone derivatives and cyclopentene derivatives adopt a quasi‐coplanar and an envelope conformation, respectively. The preferential orientation of the substituents has been established according to their nature and to the solvents by correlation to the vicinal and the long‐range coupling constants.