Ph.D., F.R.I.C. (Pp. 214, 15s.). London: Bailli6re, Tindall & Cox, 1964. Ths small book replaces the popular "Aids to Organic Chemistry" by the same author. The thirty-eight chapters cover structural isomerism and stereoisomerism, the general properties of the main groups of organic compounds and a brief description of important heterocyclic and polycyclic substances. The general lay-out is exc...

The existence of stereoisomerism can be related to the presence of structural features referred to as stereocenters. On the basis of this relationship, computer software capable of generating all stereoisomers of a given constitutional isomer has been developed. Input to the program is a canonical connection table. In an initial step the stereocenters present in the structure are identified and...

The existence of biphenyl-type atropisomerism in porphyrins has been known for more than twenty-five years. Over the last two decades, different examples of this type of stereoisomerism have been reported in the literature with regard to the use of synthetic metalloporphyrin complexes as models of heme-containing enzymes. In this article, we present a clear 1H NMR study to illustrate the concep...

Ph.D., F.R.I.C. (Pp. 214, 15s.). London: Bailli6re, Tindall & Cox, 1964. Ths small book replaces the popular "Aids to Organic Chemistry" by the same author. The thirty-eight chapters cover structural isomerism and stereoisomerism, the general properties of the main groups of organic compounds and a brief description of important heterocyclic and polycyclic substances. The general lay-out is exc...

The reactivity of different heteroscorpionate ligands based on bis(pyrazol-1-yl)methane, with different iridium-(i) and -(iii) precursors is reported. The reaction of the heteroscorpionate lithium salts "Li(bdmpza)", [bdmpza = bis(3,5-dimethylpyrazol-1-yl)acetate], "Li(bdmpzdta)" [bdmpzdta = bis(3,5-dimethylpyrazol-1-yl)dithioacetate] and "Li(S)-mbpam" [(S)-mbpam = (S)-(-)-N-α-methylbenzyl-2,2-...

Stereoisomerism describes those compounds which have the same molecular formula and chemical structure, but the atoms are orientated in a different direction. There are two isomers, each a mirror image of the other, called enantiomers. They are also called optical isomers because they rotate the plane of polarised light either to the right referred to as +, dextro, d or D isomer, or to the left...

The conformations of a variety of crystalline lignin models representing different diastereomeric forms of structural elements in lignin of the arylglycerol β-guaiacyl ether type have been studied using X-ray crystallography. Based on X-ray crystallographic data, sequences of units attached to each other by β-guaiacyl ether linkages were constructed. The appearance of the resulting oligomers sh...

Isomerization reactions are fundamental in biology, and isomers usually differ in their biological role and pharmacological effects. In this study, we have cataloged the isomerization reactions known to occur in biology using a combination of manual and computational approaches. This method provides a robust basis for comparison and clustering of the reactions into classes. Comparing our result...