Selenium Tribromide

The reaction between selenium(IV) and tetrabutylammonium tribromide is postulated to involve a direct two-electron transfer as the test for the formation of free radical was negative. The proposed active reacting species are tribromide ion and HSe03 ion.165... 

Phenylseleno phenyl tellurium reacted with bromine to form phenyl tellurium tribromide and phenyl selenium tribromide1. 

Chromic acid oxidation of 1- or 2-methylphenazine affords the corresponding carboxylic acids and oxidation with selenium dioxide gives the corresponding aldehydes.Alkoxyphenazi-nes are readily dealkylated using hydrobromic acid in acetic acid, or with aluminum tri-halides. Alkoxyphenazine A -oxides can be also dealkylated with aluminum trichloride in ethereal solution or aluminum tribromide in benzene. " ... 

Direct cleavage of the ally lie methyl ether in 106 with boron tribromide afforded codeine in only minor amounts. Better yields were obtained when 106 was converted to the corresponding carbamate before a selenium dioxide mediated oxidation delivered ketone 107. Stereoselective reduction of the ketone and concomitant generation of the iV-methyl group concluded the synthesis of codeine [60, 68]. This synthesis reported by Stork and co-workers provided a closure to several years of research, some of which has been reported in Ph.D. dissertations [69]. 

Write chemical formulas for the following molecular compounds (a) phosphorus tribromide, (b) dinitrogen tetrafluoride, (c) xenon tetroxide, (d) selenium trioxide. 

The first example of this type of laser was Nd in selenium oxychloride. Later, a less toxic and less corrosive solvent, phosphorus oxychloride, was employed. These solutions are acidified by a Lewis acid such as SnCU. Recently, laser action in phosphorus tribromide, which also has low toxicity, has been reported. AlBra and SbBrs were added to improve the solubility of Nd. 

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