Photochemistry of benzophenone-capped .beta.-cyclodextrin
摘要:
The photochemistry of 6A,6C-(3,3'-benzophenonedisulfonyl)-beta-cyclodextrin (1) is explored. Irradiation of 1 in H2O or aqueous CH3CN results in regioselective oxidation of a glucose C6 hydroxymethyl group, giving 2a and 2b via intramolecular H-abstraction by the excited benzophenone group. Molecular mechanics calculations suggest that the photooxidation occurs at the E and F glucose residues. In contrast, irradiation of 1 in aqueous i-PrOH gives rise to pinacol coupling products 3a-c.