The photorearrangement of benzyl phenyl ethers and methyl phenoxyacetates was investigated in methanol and in complexes with cyclodextrin in both the solid state and aqueous solutions. Irradiation in cyclodextrin media leads to a large change in product distribution with a very significant ortho selectivity different from that found in methanol where the reaction is non-selective. For meta-substituted ethers and phenoxyacetates, an impressive regioselectivity between the two ortho-rearranged isomers is observed and this is significantly enhanced by increasing the substituent chain length which acts as a spacer to induce a tight fit between the host and the guest. The observed results are rationalized on the basis of specific orientations of the unsubstituted and metasubstituted ethers and phenoxyacetates in the cyclodextrin cavity.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of Photochemistry and Photobiology, A: Chemistry|
|State||Published - Dec 1992|
ASJC Scopus subject areas
- Chemical Engineering(all)
- Physics and Astronomy(all)