Ab Initio Calculations: Methods and Applications in by Petr Carsky, Miroslav Urban

By Petr Carsky, Miroslav Urban

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E. a (þ)-enantiomer could be either R or S). 3 The D and L nomenclature This old-fashioned nomenclature uses glyceraldehyde (or 2,3-dihydroxypropanal) as the standard. The (þ)-enantiomer is given the label D (from dextrorotatory), the (À)-enantiomer is given the label L (from laevorotatory). 1) L -(–)-glyceraldehyde Any enantiomerically pure compound that is prepared from, for example, Dglyceraldehyde is given the label D. Any enantiomerically pure compound that can be converted into, for example, D-glyceraldehyde is given the label D.

A tBu rather than a Me group) will sit in the equatorial position. X X tBu X X Me The bulkier tBu group prefers the equatorial position diequatorial conformer (lower energy) diaxial conformer (higher energy) When the two substituents on the ring are both pointing up (or both pointing down), then these cyclic compounds are designated as cis- stereoisomers. 3). 3 Configurational isomers The spatial arrangement of atoms or groups in molecules is known as configuration. Compounds with the same molecular formula and bonds, which cannot be interconverted without breaking a bond, have different configurations (and are known as configurational isomers).

If the arrow is anticlockwise then the stereogenic centre has the S configuration. 1). e. a (þ)-enantiomer could be either R or S). 3 The D and L nomenclature This old-fashioned nomenclature uses glyceraldehyde (or 2,3-dihydroxypropanal) as the standard. The (þ)-enantiomer is given the label D (from dextrorotatory), the (À)-enantiomer is given the label L (from laevorotatory). 1) L -(–)-glyceraldehyde Any enantiomerically pure compound that is prepared from, for example, Dglyceraldehyde is given the label D.

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