Interpretation of Some Organic Photochemistry

Abstract

A general introduction to current organic photochemical research is presented. A limited survey of typical organic photochemical reactions, with an emphasis on recent studies, is given. Reactions of the n-pi* and pi-pi* type are included. Some new thoughts are included; among these is the relation of Möbius strip geometry to organic photochemistry.

Synthesis and Properties of the First Möbius Annulenes

“…As this is often the case in natural sciences, the applications of Heilbronners prediction came from an unexpected field. Only two years later in 1966 Zimmerman [3][4][5] proposed an alternative version of the Woodward-Hoffman rules based on the Hückel-Mçbius aromaticity of transition states. From 1964 to date more than 200 papers were published that predict the properties of hypothetical Mçbius annulenes, such as Mçbius coronenes and kekulenes, [6,7] Mçbius cyclacenes, [8][9][10] spiroaromatic systems, [11] heteroannulenes, [12] and cyclic allenes.…”

“…JA C H T U N G T R E N N U N G (6-H,7-H) = 7.4 Hz, 3 JA C H T U N G T R E N N U N G (6-H,7-H) = 7.4 Hz, 4 JA C H T U N G T R E N N U N G (6-H,8-H) = 2.0 Hz, 2 H; 6-H B ), 6 Data for compound 7 (Hückel C s ): …”

Toward a computational photobiology

“…Between 1966 and 1972, Zimmerman, Michl, and Salem [9][10][11][12][13][14] were the first to propose, independently, that for a broad class of organic reactions the structure of the funnel could be determined by locating a "cone-shaped" crossing of the excited and ground-state (potential) energy surfaces, known as CI.…”

Qualitation and quantitation of some terphenylquinones

“…This important molecular feature is of potential biochemical significance in energy transfer, long-range transmission of electronic excitation, and resonance stabilization of activated complexes (1). Molecular biology and pharmacology (2, 3), the molecular orbital approach to quantum chemistry (1,4), photochemistry of organic compounds (5-7), and oxidation-reduction mechanisms in polymers (8) are examples of other areas where study of quinoid systems is useful.…”