Pericyclic Reactions Introduction, Cycloaddition Reactions, pdf, M.Sc. Second Year, Third Semester

M.Sc. Second year Postgraduate degree course Semester Third Photochemistry, Free Radicals And Pericyclic Reactions

paper CHEO-316

Chapter

UNIT - I Pericyclic Reactions-I

Features and classification of pericyclic reactions,
Phases, nodes and symmetry properties Of molecular orbital in ethylene, 1,3 - butadiene , 1,3,5 - hexatriene.
Allyl cation, allyl radical, pentadienyl cation and pentadienyl radical. Thermal and photochemical reactions.

UNIT - II Pericyclic Reactions - II

Cycloaddition reactions: Suprafacial and antarafacial interactions. cycloadditions.
Cycloreversions. Stereochemical aspects in supra - supra, antara - supra and antara - antara
1,4-cycloadditions. Diels - Alder reaction. Woodward - Hoffmann selection rules for cycloaddition reactions.
Explanation for the mechanism of cycloaddition reactions by 1) Conservation of orbital symmetry and orbital symmetry correlation diagrams 2) Fukui Frontier Molecular Orbital (FMO) theory and 3) Huckel - Mobius aromatic and antiaromatic transition state method. Endo - exo selectivity in Diels - Alder reaction and it's explanation by FMO theory. Examples of cycloaddition reactions.

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