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Photochemical Reactions and Their Kinetics

Absorption of a photon by an organic molecule, R, leads to the formation of an electronically excited state, R of the molecule. [Pg.210]

In a concerted process (i.e., in a single step) gives the product P  [Pg.210]

These concerted processes include a series of pericyclic reactions from Si (jt, n ) via cyclic transition states, where o or a bonds are cleaved and formed simultaneously. [Pg.210]

These include free radical reactions involving diradical intermediate or intermediates from either Si n, n n, n ) or Ti ( i n, n, i ). The most common photochemical reactions are the reactions of carbonyl compounds, alkenes, and aromatic compounds as well as chain reactions of hydrocarbons. [Pg.210]

All these photochemical reactions involve fiinnel-Iike conical intersections (CIs) in their electronic excited and ground-state potential energy surfaces, where the cones touch each other to give reactive intermediates and products (Fig. 6.21). These conical intersections are analogous to transition state in thermal reactions [26] (Fig 6.22). [Pg.210]


See other pages where Photochemical Reactions and Their Kinetics is mentioned: [Pg.210]    [Pg.211]   


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