Journal of Chemical Sciences | |
Guest-host interactions in the cleavage of phenylphenyl acetates by ð›½-cyclodextrin in alkaline medium | |
T Chandrakala1  K Rajasekaran11  V Raj1  | |
[1] Post Graduate Department of Chemistry, VHNSN College, Virudhunagar 626 002$$ | |
关键词: Phenylphenyl acetate; ð›½-cyclodextrin; hydrophobic interactions; guest-host complexes.; | |
DOI : | |
来源: Indian Academy of Sciences | |
【 摘 要 】
Kinetics of cleavage of phenylphenyl acetates (PPA) and several para-substituted PPAs in basic aqueous sodium carbonate-bicarbonate buffer containing ð›½-cyclodextrin (CD) have been studied. The reaction exhibits saturation type kinetics and CD accelerates the rate of cleavage by the formation of 1G : 1H inclusion complex. The kinetic results indicate that aryloxy moiety of PPA is included in the hydrophobic cavity of CD. The overall rate constants for the cleavage of the [CD-ester] complex correlate with the Hammett ðœŽ-constants and Hansch hydrophobicity parameters ðœ‹. At higher concentrations of CD, there is an additional catalysis due to the formation of weak 1G : 2H complex.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040507934ZK.pdf | 171KB | download |