Photolysis of Dialkoxy Disulfides: A Convenient Source of Alkoxy Radicals for Addition to the Sphere of Fullerene C60
摘要:
Photolysis of dialkoxy disulfides ROSSOR (R = Me, Et, i-Pr, t-Bu, i-PrCH2, t-BuCH(2)) yields the radicals RO(.), ROS(.), and ROS(.)=O that were identified on the basis of product analysis and spin trapping techniques. It has been shown that only the alkoxy radicals RO(.), produced from ROSSOR, add to the sphere of fullerene C-60 in steady state conditions to yield the RO-C-60(.) adducts which can be detected by ESR spectroscopy. The different trend of the hydrogen splitting constants in the RO-C-60(.) with respect to the corresponding RS-C-60(.) adducts previously reported has been interpreted as a consequence of the different C-O and C-S bond lengths.
A Practical Synthesis of Mixed Allyl and Allenesulfinates
作者:Samuel Braverman、Tatiana Pechenick
DOI:10.1055/s-2003-41038
日期:——
by treatment of symmetrical dialkoxy disulfides (ROSSOR) with alcohols at room temperature has been found. Subsequent spontaneous [2,3]-sigmatropic rearrangements of mixed sulfoxylates such as alkylallyl and alkyl propargyl sulfoxylates afford mixed alkylallyl and alkyl allenesulfinates in good yield. The latter are not readily available by other routes.
Synthetically-derived S,S-heterodisubstituted disulfides that exhibit potent in vitro antibacterial activity against a variety of bacteria, including Staphylococcus aureus, methicillin-resistant Staphylococcus aureus and Francisella tularensis. The present invention provides compounds, methods and compositions effective to treat microbial/bacterial infections, and, especially, infections arising from bacteria which have developed resistance to conventional antibiotics.
Synthesis and antimicrobial activities of structurally novel S,S′-bis(heterosubstituted) disulfides
作者:Praveen Ramaraju、Danielle Gergeres、Edward Turos、Sonja Dickey、Daniel V. Lim、John Thomas、Burt Anderson
DOI:10.1016/j.bmcl.2012.04.056
日期:2012.6
The central focus of this study is on the antibacterial and antifungal properties of synthetically produced S,S'-bis(heterosubstituted) disulfides as a means to control the growth of various infection-causing pathogens. Staphylococcus aureus, Francisella tularensis and Candida albicans were each found to be highly susceptible to several of these compounds by agar or broth dilution and Kirby-Bauer diffusion assays. These structurally simple, low molecular weight disulfides have shown promising bioactivities and may serve as leads to the development of effective new antibacterials for pathogenic bacteria such as methicillinresistant S. aureus and F. tularensis. (C) 2012 Elsevier Ltd. All rights reserved.
Schmidt, Heinar; Steudel, Ralf, Zeitschrift fur Naturforschung, B: Chemical Sciences, 1990, vol. 45, # 4, p. 557 - 558