21CHY216 PHOTOCHEMISTRY AND PERICYCLIC REACTIONS CHEMISTRY PAPER – V-

Unit I-

Photochemistry: Laws of photochemistry – Grothus-Draper law, Stark-Einstein law, examples of photochemical reactions, Beer law and Beer-Lambert’s law, Jablonsky diagram, qualitative description of fluorescence, phosphorescence, non-radiative processes (internal conversion, intersystem crossing), Quantum yield, primary and secondary processes.

Unit II-

Basic concepts of photosensitized reactions – photosynthesis, dissociation of hydrogen molecule, isomerization of 2-butene, and chemiluminescence.

Unit – III-

Molecular orbital symmetry, frontier orbitals of ethylene, 1,3 Butadiene, 1,3,5- Hexatriene,allylsystem, classfication of pericyclic reactions FMO approach, Woodward Hoffmann correlation diagram method and perturbation of molecular (PMO) approach for the explanation of pericyclic reactions under thermal and photochemical conditions.

Unit – IV-

Cycloadditions: Antarafacial and suprafacial additions, notation, ofcycloadditions, (4n) and (4n+2) systems with a greater emphasis on (2+2) and (4+4) – cycloadditions, (2+2) – additions of ketones secondary effects of substitutes on the rates of cycloadditions and chelotropic reactions.

TEXTBOOKS:

  1. Fleming, Pericyclic Reactions, Oxford University Press, Oxford, 1999.
  2. Mukherjee, S.M. and Singh, S.P., Pericyclic Reactions, MacMillan India, New Delhi.

REFERENCE:

  1. Turro, N. J., Scaiano, J. C., and Ramamurthy, V., Modern Molecular Photochemistry of Organic Molecules, University Science Books, 2010.