1632-89-9Relevant articles and documents
Zanetti,Sickman
, (1936)
Reactions of OH Radicals with Methanethiol, Dimethyl Sulfide, and Dimethyl Disulfide in Air
Hatakeyama, Shiro,Akimoto, Hajime
, p. 2387 - 2395 (1983)
Photooxidations of CH3SH, CH3SSCH3 (DMDS), and CH3SCH3 (DMS) in air were performed with alkyl nitrites as sources of OH radicals.Sulfur-containing final products are SO2, CH3SO3H (methanesulfonic acid), and a little H2SO4 in all cases.CH3SH reacts with OH to form an adduct, which further reacts with alkyl nitrites to give CH3SNO (methyl thionitrite) and the corresponding alcohols.CH3S radical produced by photolysis of CH3SNO gives final products.DMDS also reacts with OH via addition followed by rapid cleavage of the S-S bond, resulting in CH3S and CH3SOH.Reaction of DMS with OH can be explained by both addition and abstraction.In both cases the CH3S radical is the main intermediate which produces final products.The reaction of the CH3S radical with O2 proceeds via addition and gives HCHO + SO2 or CH3SO3H as final products.The rate constant ratios of CH3S with NO and O2 were obtained to be ca. 2 x 1E3, which is about one-tenth of that for CH3O.
Nazarov Reaction of Trisubstituted Dienones: Mechanism Involving Wagner-Meerwein Shift
Motoyoshiya, Jiro,Yazaki, Toshikazu,Hayashi, Sadao
, p. 735 - 740 (1991)
The Nazarov reactions of trisubstituted α,α'-dienones were studied.Whereas α,β-dimethyl-β'-alkyl α,α'-dienones gave 2,3-dimethyl-4-alkyl-2-cyclopentenones when heated in concentrated sulfuric acid, the reaction of β,β-dimethyl-β'-alkyl α,α'-dienones afforded 3,4-dimethyl-4-alkyl-2-cyclopentenones as the rearranged products.A mechanistic investigation using two deuterated dienones suggests that the Nazarov reactions of the latter dienones are accompanied by Wagner-Meerwein shifts to form the most stable carbocations.
Biosynthesis of the benz[a]anthraquinone antibiotic PD 116198
Gould,Cheng
, p. 11135 - 11144 (2007/10/02)
The labelling pattern obtained from incorporation of a mixture of sodium [1-13C]- and [2-13C]acetates has confirmed the irregular derivation of the benz[a]anthraquinone skeleton of the angucycline antibiotic PD 116198. Subsequent incorporations of sodium [1-13C, 18O2]-, and [1-13C, 2-2H3]acetates and of 18O2 have revealed the origins of the hydrogen and oxygen atoms of the antibiotic. The possibility of a 'two-chain' biosynthesis was tested by feeding 2H-labeled orsellinates; however, no incorporation was detected. PD 116198 seems most plausibly derived by rearrangement of an initially-formed linear tetracyclic intermediate.
