Showing papers in "Chemical Reviews in 1979"

Reactions of nitric oxide coordinated to transition metals

Abstract: A review of the reactions of nitric oxide coordinated to transition metals, and of interest in air pollution control, organo-nitorgen compound synthesis (from nitric oxide, by using transition metal catalysts), and theoretical studies of differences between CO and NO binding to metals, examines the three principal bonding modes in nitrosyl complexes (all metal-to-nitrogen interactions) which involve terminal linear M-N-O groups, terminal bent M-N-O groups (the applicability of the 18-electron rule), and bridging NO groups and covers nucleophilic attack (the nitroprusside ion, reactions of other nitrosyl complexes with nucleophiles); electrophilic attack (the protonation of NO, oxygenation, other O-atom transfer reactions, and formation of N-C bonds); reduction (one-electron and multi-electron processes, and heterogeneous reduction of NO); homogeneous disproportionation of NO (reaction of coordinated NO with nitric oxide, reactions of NO with CO catalyzed by metal complexes); and other reactions, including NO insertion reactions.

Electronic spectroscopy of polyatomic molecules by low-energy, variable-angle electron impact

Abstract: The paper is a review and evaluation of some of the work done in this field over the last few years. Compounds discussed are polyatomic molecules, ethylene, fluoroethylenes, alkynes, polyenes, benzene and fluorobenzenes, five-membered heterocycles, and azo compounds. 124 references, 16 figures, 1 table.

The photoexcited states of organic anions

Abstract: In this review attention is focused on the highly polarized organometallic compounds whose reactivity fits two characteristics: (1) the primary light absorption involves transitions within states associated with the organic portion of the molecule; and (2) ground-state thermal reactions parallel those which might be expected of the corresponding free anion. Organoalkali metal compounds receive major attention as meeting these two characteristics, and the organoalkali metal compounds are occasionally compared to other organometallics. The spectral properties of the anions of these compounds (and the structural conclusions that can be derived therefrom) and the photochemical reactions of these compounds (ranging from single electron transfer through geometrical isomerization to the more complex photochemical pericyclic reactions and stepwise bond-forming reactions) are the principal areas of interest. 279 references. (BLM)

Photooxygenations of nitrogen heterocycles

Abstract: This review attempts to catalogue some of the reported photooxygenated reactions of different nitrogen heterocycles. Attention has been focused on the different types of products formed in these reactions and some of the suggested pathways for their formation. Although detailed studies on the mechanism of photooxygenation reactions have been performed, there is a scarcity of such studies in the area of nitrogen heterocycles. The examples included in this review are mostly those of photooxygenation reactions brought about in the presence of a sensitizer. In some cases, unsensitized photooxidations may also be involved. 157 references.