53586-62-2Relevant articles and documents
Conformation in 2,3-Difluorobutanes
Angelini, G.,Gavuzzo, E.,Segre, A. L.,Speranza, M.
, p. 8762 - 8766 (2007/10/02)
A conformational analysis for meso- and d,l-2,3-difluorobutanes has been carried out, employing 1H and 19F NMR and theoretical calculations.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.
Reaction of OH with CH3CH2F. The Extent of H Abstraction from the α and β Positions
Singleton, Donald L.,Paraskevopoulos, George,Irwin, Robert S.
, p. 2339 - 2343 (2007/10/02)
The mechanism of the reaction of OH radicals with C2H5F was determined from the yields of the reaction products.Hydroxyl radicals were generated in the gas phase by photolysis of H2O at 184.9 nm, and products were analyzed by gas chromathography and mass spectrometry.The reaction proceeds by abstraction of hydrogen primarily from the α position, and the major products were meso- and d,l-2,3-C4H8F2, 1,3-C4H8F2, 2-C4H9F, and H2.The minor products were 1,4-C4H8F2, 1-C4H9F, 1-and 2-C3H7F, C2H6, C2H4, C2H3F, and C2H2.It was found that kinetically hot H atoms formed in the photolysis of H2O abstract hydrogen to some extent at the β position of C2H5F in contrast to thermal H atoms which abstract exclusively at the α position.After correction for the effects of H atom reactions, it was estimated that 85+/-3percent of the abstraction by occurs at the α position of C2H5F.
