Conformations, of acyclic

Acyclic Compounds. Different conformations of acyclic compounds are best viewed by construction of ball-and-stick molecules or by use of Newman projections (see Fig. 1.2). Both types of representations are shown for ethane. Atoms or groups that are attached at opposite ends of a single bond should be viewed along the bond axis. If two atoms or groups attached at opposite ends of the bond appear one directly behind the other, these atoms or groups are described as eclipsed. That portion of the molecule is described as being in the eclipsed conformation. If not eclipsed, the atoms... 

Conformations of acyclic chains 2-Carb-6. Anomeric forms use of a and (3... 

Fig. 18 Typical conformations of acyclic localized 1,3-diradicals, including disrotatory conformers a and c, and conrotatory conformer b...

Conformational Equilibria of Acylated Aldopentopyranose Derivatives and Favored Conformations of Acyclic Sugar Derivatives... 

The 191 problems in this book cover most of the area of stereochemistry, including nomenclature, stereogenic elements (centers, axes, planes) and their descriptors, symmetry, inorganic stereochemistry, determination of enantiomer excess, conformation of acyclic and cyclic compounds, and more. The answers, in addition to providing solutions to the problems, frequently include additional explanations of the underlying principles. The problems are ordered more or less in order of increasing difficulty. (I had a hard time with some of the problems toward the end myself )... 

Eliel E, Wilen SH (1994) Stereochemistry of organic compounds. Conformation of acyclic molecules. Wiley, New York, pp 597-664, chap 10... 

D. Horton and J. D. Render, Conformation of acyclic detivtdves at sugars, Cartokydr. Res. 15 271 (197D). 

There have appeared several studies on the conformation of acyclic phos-phonic and phosphinic esters and some calculations on the equilibrium conformation of a series of enol phosphates have been reported.Crystal structure determinations on the very reactive cyclic phosphate (1 R = MeO) have shown that the five-membered ring is almost planar and that the carbonyl bond is short. 

A.) these react more strongly with borate ions than do their trans isomers (0-0, 3.40 A.). In the planar, zigzag conformation of acyclic cis- and irans-l, 2-diols, the oxygen atoms are separated by a distance of 3.65 and 2.82 A., respectively, but can, in an eclipsed conformation, approach each other to a distance of 2.49 A. The greater electrophoretic mobility of the acyclic interaction energy of the nonbonded atoms in the essentially planar diol-borate complex. ... 

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