Hindered Rotation in Molecules with Relatively High Potential Barriers
نویسندگان
چکیده
منابع مشابه
Determination of the Very High Barriers to Conformational Processes by the Neat Racemization Technique. Part 1: Barriers to Ring Inversion in Dibenzo [a,c] Dinaphtho [2,3-e; 2,3-g] Cyclooctatetraene and Hindered Rotation in 2,2'-Dimethyl Binaphthyl
A method is described by which it is possible to determine the high barrier to ring inversion and hindered rotation by neat racemization of optically active compounds when the racemization is caused by ring inversion or hindered rotation. The method is based preparation of sufficiently pure enantiomers, mainly by chromatography on swollen microcrystalline triacetylcellulose (TAC). By this t...
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The existence of a rotational barrier of ca. 3 kcalmol 1 around the C C single bond in ethane has been known since the early studies of Ebert, Wagner, Eucken and Weigert and Pitzer done in the 1930s. Even the simplest ab initio methods are able to reproduce this fundamental result. However, the physical origin of this hindered rotation is still under controversy in the literature. There are two...
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1 H. Metzner, B. Metzner, and M. Calvin, Arch. Biochem. and Biophys. (in press). 2 H. Metzner and B. Metzner, University of California Radiation Laboratory Report, UCRL 3710 (March, 1957), p. 4; H. Metzner, H. Simon, B. Metzner, and M. Calvin, these PROCEEDINGS, 43, 892, 1957. 3 H. Metzner, H. Simon, and B. Metzner, University of California Radiation Laboratory Report, UCRL 3950 (September, 195...
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Barriers to rotation about the C-N bond in the cis and trans isomers of N-methylformamide have been determined by n.m.r. spectroscopy. Representative values are 20.7 and 22.0 kcal/mole. Arrhenius parameters have also been determined. These results are compared with C-N barriers for N,N-dimethylformamide and unsubstituted formamide. The data suggest that C-N rotational barriers for N-methyl amid...
متن کاملQuantum unidirectional rotation directly imaged with molecules
A gas-phase molecular ensemble coherently excited to have an oriented rotational angular momentum has recently emerged as an appropriate microscopic system to illustrate quantum mechanical behavior directly linked to classical rotational motion, which has a definite direction. To realize an intuitive visualization of such a unidirectional molecular rotation, we report high-resolution direct ima...
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ژورنال
عنوان ژورنال: The Journal of Chemical Physics
سال: 1957
ISSN: 0021-9606,1089-7690
DOI: 10.1063/1.1743262