Substituent Effects on the Photocleavage of Benzyl−Sulfur Bonds. Observation of the “<i>Meta</i> Effect”
作者:Steven A. Fleming、Anton W. Jensen
DOI:10.1021/jo9606923
日期:1996.1.1
substituted benzyl phenyl sulide. The effect of oxygen on quantum yields is best observed after samples are thoroughly outgassed with consecutive freeze-pump-thaw cycles. It is shown that oxygen diminishes the substituenteffect. Upon photolysis of the outgassed samples, the meta-substituted derivatives showed more significant variances than the para derivatives. The meta derivatives are most efficiently
The nucleoside transport inhihitor 6-[(4-nitrobenzyl)thio]-9-(beta-D-ribofuranosyl)purine, NBMPR, has been used successfully in photoaffinity labeling. We have studied the mechanism for photocleavage of the benzyl-sulfur bond by using substituted benzyl phenyl sulfides as analogues of NBMPR. This has enabled us to enhance the photoreactivity of the benzyl-sulfur bond. We have also performed ,,radical clock'' studies with a hexenyl side chain to trap reactive intermediates. The mechanistic interpretation from the substituent and side chain studies is that the benzyl-sulfur moiety is photocleaved via a homolytic pathway.
Nucleophilic displacements on halogen atoms. II. Kinetic study of the reactions of .alpha.-Halo sulfones with triphenylphosphine
作者:Bruce B. Jarvis、John C. Saukaitis
DOI:10.1021/ja00804a027
日期:1973.11
Wladislaw, B.; Marzorati, L.; Ebeling, G., Phosphorus, Sulfur and Silicon and the Related Elements, 1990, vol. 48, # 1-4, p. 163 - 167