Nomenclature amine metal complexes

Nomenclature.—A definite system of nomenclature has been adopted for metal-ammines, and the old names derived from the colour of the compounds have, in the main, been abandoned, as they lead to confusion. The system adopted is that suggested by Werner. Ammonia molecules present in the complex are indicated by the terms monam-mino, diammino, triammino, tetrammino, pentammino, hexammino, the word ammino, written with a double m, having been adopted to show the relationship with ammonia and to distinguish from the ammonium salts and the substituted ammonia compounds, namely, the amines. 

The interrelation among homovalent and ambivalent reactions on the five-atom pericycles (equations 3 and 4) was described and given a similar but more complex nomenclature reflecting their lower symmetry. Homovalent pericycles include the amine oxide eliminations in Scheme 1 and the sulfoxide-sulfenate rearrangement in Scheme 2, with the shells in boldface as in Figure 1. For the ambivalent reactions of equation (4) the ambivalent atom X is often not carbon, as seen in Scheme 3 for a metal reduction of vicinal dihalides (which may not be pericyclic) Scheme 3 has an unchanging shell of only one bond. The cycloaddition of sulfur dioxide to dienes in Scheme 4 is another with a three-bond shell. Numerous examples were quoted, again many not confirmed as pericyclic. ... 

The literature available from the end of the last report (December 1989) to September 1991 is covered in this chapter. A complete revision of the International Union of Pure and Applied Chemistry (lUPAC) " Nomenclature for Inorganic Chemistry has appeared and lUPAC-recommended ligand abbreviations will be used wherever possible. Research activity in chromium chemistry continues at about the same level as in the past, but there are odd surges as new techniques " or complexes become available. As in previous years, the general chemistry of chromium has been reviewed. l Other, more specialist reviews include the spectroscopy of Cr(VI), organochromium(III) chemistry,and macrocyclic complexes of chromium in various oxidation states.Closer to the mechanistic area is a review of the photophysics of chromium(III) complexes and, more specifically, the photochemical water-exchange process in chromium(III) complexes. A summary of new insights into the mechanism of spontaneous and base-catalyzed substitution reactions of inert-metal amine complexes has also appeared. ... 

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