Abstract
Acidic zeolites HY and CaY catalyse the Wallach rearrangement of azoxybenzene ( I) leading mainly to the formation of para-hydroxyazobenzene ( II) and ortho-hydroxyazobenzene ( III). In this transformation, increasing the loading level of I results in the formation of a larger amount of para-isomer. As observed in isotropic media, photochemical Wallach rearrangement in the presence of various cation-exchanged faujasites results in the predominant formation of the ortho-isomer from the S 1 state and this rules out any appreciable heavy atom effect.
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