engleski

Synthesis and photochemical transformations of new butadiene chromophores: the influence of the nature and position of chlorine substituent on the photoinduced behaviour

The photochemical behavior of mono- and dichloro- substituted butadiene derivatives was studied at low concentrations. These compounds display diverse photochemical behavior. The -chloro derivatives photocyclize to give six-membered ring photoproducts. p-Chloro-substituted butadienes undergo intramolecular [2+2] cycloaddition followed by formation of benzobicyclic structures. The steric hindrance of chlorine(s) in - position(s) cause a greater deviation from planarity, relative to p-substitution, and shift conformer equilibria and affects the reaction pathways and yields.

butadiene ; chlorine ; photochemistry ; reaction mechanism ; spectroscopy

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