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.
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
作者:Sylvie L. Tardif、Andrzej Z. Rys、Charles B. Abrams、Imad A. Abu-Yousef、Pierre B.F. Lesté-Lasserre、Erwin K.V. Schultz、David N. Harpp
DOI:10.1016/s0040-4020(97)00555-3
日期:1997.8
The chemistry of the generation and trapping of diatomicsulfur (S2) and sulfur monoxide (SO) are reviewed with special emphasis on recent work, including initial efforts to detect and trap diatomic selenium (Se2).
Preparation of 4-Substituted Benzyl Sulfoxylates and Related Chemistry
作者:Sylvie L. Tardif、David N. Harpp
DOI:10.1021/jo991360b
日期:2000.8.1
sulfoxylates (7b, 4-NO(2); 7c, 4-Cl; 7d, 4-CH(3)O, 7e: 4-CH(3)) are reported. The unexpected stability of 7b has permitted the first X-ray determination at room temperature of a sulfoxylate. The thermalisomerization of sulfoxylates 7b-c to sulfinates 8b-c was studied in different solvents (toluene-d(8), CDCl(3), and CD(3)CN) and interpreted as a concerted unimolecular process following first-order kinetics
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.