A conformation anal. for meso- and d,l-2,3-difluorobutanes has been carried out, employing 1H and 19F NMR and theor. calcns. The real configurations of the two isomers were assigned by specific optical rotation measurements of the products coming from an optically active precursor. Gauche conformations were predominant for meso (E) isomer, while the d,l (T) isomer showed all possible staggered rotamers almost equally populated. Finally remarks for NMR peak assignment of homo- and copolymers partially fluorinated by using gauche additive effects are given.
CONFORMATION IN 2,3-DIFLUOROBUTANES / Angelini, Giancarlo; E., Gavuzzo; Segre, Annalaura; Speranza, Maurizio. - In: THE JOURNAL OF PHYSICAL CHEMISTRY. - ISSN 0022-3654. - STAMPA. - 94:25(1990), pp. 8762-8766. [10.1021/j100388a004]
CONFORMATION IN 2,3-DIFLUOROBUTANES
ANGELINI, Giancarlo;SEGRE, ANNALAURA;SPERANZA, Maurizio
1990
Abstract
A conformation anal. for meso- and d,l-2,3-difluorobutanes has been carried out, employing 1H and 19F NMR and theor. calcns. The real configurations of the two isomers were assigned by specific optical rotation measurements of the products coming from an optically active precursor. Gauche conformations were predominant for meso (E) isomer, while the d,l (T) isomer showed all possible staggered rotamers almost equally populated. Finally remarks for NMR peak assignment of homo- and copolymers partially fluorinated by using gauche additive effects are given.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
