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.
Chemical shift and coupling constant analysis of dibenzyloxy disulfides
作者:Eric G. Stoutenburg、Ganna Gryn’ova、Michelle L. Coote、Ronny Priefer
DOI:10.1016/j.saa.2014.10.109
日期:2015.2
Dialkoxy disulfides have found applications in the realm of organic synthesis as an S2 or alkoxy donor, under thermal and photolytic decompositions conditions, respectively. Spectrally, dibenzyloxy disulfides possess an ABq in the (1)H NMR, which can shift by over 1.1ppm depending on the substituents present on the aromatic ring, as well as the solvent employed. The effect of the said substituents and solvent
Photolytic, autocatalyzed decomposition of benzylic dialkoxy disulfides
作者:DiAndra M. Rudzinski、Ronny Priefer
DOI:10.1016/j.tetlet.2009.01.115
日期:2009.4
fragmentation to liberate trappable S2, and can yield an alkoxy radical under photolytic conditions. We have examined a family of benzylic dialkoxy disulfides (X–Ph–CH2–O–S–S–O–CH2–Ph–X) under photolytic conditions and observed a correlation of decomposition based upon the substituent. We have been able to show that the decomposition is autocatalyzed and has a parabolic correlation with Swain and Lupton’s