Dimethyl selenone

Methylated organo-selenium has been determined by GC/MS or fluorine-induced chemiluminescence to determine DMSe, DMDSe, and DMSeS. This last compound, dimethyl selenenyl sulfide, was mistakenly identified as dimethyl selenone (CH3Se02CH3) in earlier work with bacteria.181,182 However, much recent work with many microorganisms have shown ample evidence of DMSeS production from Gram-negative bacteria,181,183 phototrophic bacteria,167,184 phytoplankton185 and in B. juncea detailed above. SPME with microwave-induce plasma atomic emission spectrometry was recently used to... 

The oxidation of selenoxides to selenones is slow requiring drastic conditions to be used. Diaryl, aryl methyl and dimethyl selenones are prepared by the oxidation of the ctxresponding selenoxides with prolonged exposure to KMn04 or ozone. The direct oxidation of selenides to selenones by FWO with ruthenium(II) complex catalyst, and C u(Mn04)2 has also been described. Aiyl trifluo-... 

C 3 branched species.Reaction of the S -ether of alkenyl selenone (86) with dimethyl malonate anion gave the cyclopropane (122) a similar reaction, but with D-/yxo-specificity, occurred with nitromethane.105... 

Proton n.m.r. and i.r. studies on 2-mercapto-5-methyl- and 2,5-dimethyl-3-mercapto-furan, -thiophen, and -selenophen indicate the presence of mainly the thiol tautomers.Carbon-13 n.m.r. has been used to distinguish thione and selenone tautomers in appropriately substituted 1,3,4-thiadiazoles and -selenadiazoles, and tetrazole derivatives. N.m.r., i.r., and u.v. studies indicate that 4-aminoisothiazole exists as the amino- and not the imino-tautomer. ... 

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