Substituent Effects on the Rate Constants for the Photo-Claisen Rearrangement of Allyl Aryl Ethers
作者:Alexandra L. Pincock、James A. Pincock、Roumiana Stefanova
DOI:10.1021/ja011981y
日期:2002.8.1
essentially identical rate constants for the excited-state processes with the exception of, the rate constant for homolytic cleavage from S(1) of the allyl ethers to give the radical pair. The difference between the fluorescence quantum yields and/or singlet lifetimes for 3 and 4 were used to obtain values of for all of the allyl ethers. These values exhibit a large substituent effect, spanning almost
This work describes the synthesis, anti-Candida, and molecular modeling studies of eighteen new glucosyl-1,2,3-triazoles derived from eugenol and correlated phenols. The new compounds were characterized by combined Fourier Transform Infrared, 1H and 13C nuclearmagneticresonance and spectroscopy of high-resolution mass spectrometry. The synthesized compounds did not show significant cytotoxicity against
Modification of photochemical reactivity by cyclodextrin complexation: selectivity in photo-claisen rearrangement
作者:M.S. Syamala、V. Ramamurthy
DOI:10.1016/s0040-4020(01)86093-2
日期:1988.1
of only one ortho isomer. It is speculated that α-cyclodextrin provides a “tight fit” while β-cyclodextrin offers a “loose fit”. This tightness of binding is suggested to be responsible for the selectivity among the ortho isomers with α-cyclodextrin as the host. Further, the results indicate that “loose cavity” can be tightened by incorporating a “molecular spacer” such as a long hydrocarbon chain