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- W2128872023 abstract "Tous les paramètres RMN sont déterminés pour les dérivés suivants du diméthyl-1,6 bicyclo[4.1.0]heptane: diméthoxycarbonyl-3,4 (3 diastéréoisomères), méthoxycarbonyl-3 (d4-2,2,5,5) cis et trans, méthyl-3 méthoxycarbonyl-3 cis et trans; les triméthyl-1,5,5 bicyclo[4.1.0]heptanols-3 cis et trans ont été également étudiés. Les divers déplacements chimiques sont corrélés grǎce à un ensemble d'incréments déterminés empiriquement. Les équilibres conformationnels sont précisés à partir des constantes de couplage vicinales; les enthalpies libres conformationnelles du groupement COOCH3 sont évaluées; le rǒle des interactions gauches est considéré. All the 1H n.m.r. parameters of the following derivatives of 1,6-dimethylbicyclo[4.1.0]heptane are determined: 3,4-dimethoxycarbonyl (3 diastereoisomers), cis- and trans-3-methoxycarbonyl-2,2,5,5-d4, cis- and trans-3-methyl-3-methoxycarbonyl; the cis- and trans-1,5,5-trimethylbicyclo[4.1.0]-3-heptanols are studied in the same way. The different chemical shifts are correlated with the aid of a collection of empiral increments. The conformational equilibria are determined from the vicinal coupling constants; the conformational free energies of the COOCH3 group are evaluated; the part played by gauche interactions is considered." @default.
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- W2128872023 date "1977-05-01" @default.
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- W2128872023 title "Interactions intramoléculaires. XXVII—Etudes structurales en série bicyclo[4.1.0]heptanique (effets d'anisotropie sur les déplacements chimiques du proton; constantes de couplage et équilibres conformationnels)" @default.
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- W2128872023 doi "https://doi.org/10.1002/mrc.1270090505" @default.
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