Thermolytic decomposition of benzylic dialkoxy disulfides
作者:DiAndra M. Rudzinski、Mary P. McCourt、Ronny Priefer
DOI:10.1016/j.tetlet.2009.07.084
日期:2009.9
non 1:1 ratio of alcohol to aldehyde reaffirms Harpp’s-postulated cage mechanism. We have shown that the ratio is dependant upon the substituent present which can enhance the pi-stacking ability with the solvent, and thus favor diffusion out of the solvation cage yielding the non 1:1 ratio observed.
Generalized Synthesis and Physical Properties of Dialkoxy Disulfides
作者:Eli Zysman-Colman、David N. Harpp
DOI:10.1021/jo050574s
日期:2005.7.1
of the inherently large barrier to rotation and the resultant thermal decomposition pathway is discussed. Both phenomena are shown to be solvent independent; hinderedrotation is substrate independent. The decomposition of 1a is ca. 7 kcal/mol higher than the barrier to rotationabout the S−S bond. The combined evidence suggests acyclic unsymmetric homolytic cleavage of the dialkoxy disulfide.
Thermochemical properties of dibenzyloxy disulfides
作者:Eric G. Stoutenburg、Anne E. Palermo、Ronny Priefer
DOI:10.1016/j.tca.2012.10.028
日期:2013.1
The in situ thermal behavior of dialkoxy disulfides (-OSSO-) has been previously explored, however their neat thermal stability has yet to be examined. We synthesized a library of ten dibenzyloxy disulfide derivatives with various para-substituents. Each derivative was analyzed by TGA and DSC to discern molecular fragmentation. A correlation of the pattern of fragmentation to Swain and Lupton's R-value was observed. Also, DSC analysis revealed that when the para-substituent was a phenyl (i.e. bis(p-phenylbenzyloxy) disulfide), and successive runs were performed, the thermogram showed the presence of the fragmentation, and upon H-1 NMR analysis its corresponding alcohol and aldehyde were observed. (C) 2012 Elsevier B.V. All rights reserved.