Dimethyl sulfoxide-hydrogen bromide

Dimethyl sulfoxide/hydrogen bromide Sulfonic acids from mercaptans s. 31,82... 

Dimethyl sulfoxide hydrogen bromide Sulfonic acids from disulfides with Og/KOH cf. 19, 126 with dimethyl sulfoxide in 0. G. Lowe, J. Org. Chem. 41, 2061 (1976) Me SO/HBr RSSR 2 RSO3H the presence of HBr s. 

Moore and Snyder121 have employed the Schmidt reaction to determine the structure of the hydrocarbon (71), which is one of the products of the self-condensation of acetophenone in polyphosphoric acid. Treatment with hydrogen bromide and dimethyl sulfoxide (DMSO) gives the fluorenol (72), which yields a mixture of 1-methyl-2,4,6-triphenylphenanthridine (73) and 10-methyl-6,7,9-triphenyl-phenanthridine (74) when treated with hydrazoic acid. 

Other hazardous reactions may occur with carbon (e.g., soot, graphite, activated charcoal), dimethyl sulfoxide, ethylene oxide, chlorine, bromine vapor, hydrogen bromide, potassium iodide + magnesium bromide, chloride or iodide, maleic anhydride, mercury, copper(II) oxide, mercury(II) oxide, tin(IV) oxide, molybdenum(III) oxide, bismuth trioxide, phosphoms trichloride, sulfur dioxide, chromium trioxide. 

Oxidations of a-methyi and a-methyiene groups are also effected by dimethyl sulfoxide in the presence of aqueous hydrobromic acid [1001] or hydrogen bromide [1002] (equation 409). 

Heating 1,3-indanedione with dimethyl sulfoxide and anhydrous hydrogen bromide at 70-90 C, removing the resulting dimethyl sulfide by distillation, and heating the residue for 1 h at 100 °C with 0.3 N hydrochloric acid furnish ninhydrin in 80-82% yield [1002],... 

Corey and co-workers " found that when powdered sodium hydride is stirred into excess dimethyl sulfoxide under nitrogen at 65-70° hydrogen is evolved with formation of a solution of the highly reactive sodium methylsulfinyl methylide (1). This salt reacts with ethyltriphenylphosphonium bromide at room temperature to form the Wittig reagent (2), as shown by its rapid reaction with benzophenone to form 1,1-diphenylpropene-l (3). The strongly basic character of methylsulfinyl... 

An efficient procedure for the preparation of ethyl glyoxalate consists in oxidation of ethyl bromoaeelale in, 3 equivalents of dimethyl sulfoxide at 70° in the presence of 1.2-cpoxy-3-phcnoxypropiinc. a nonalkaline scavenger for hydrogen bromide, and... 

Isomerization Aluminum bromide. Boron trifluoride-Hydrogen fluoride. Dimethyl sulfoxide. Formic acid. N-Lithioethylenediamine. Mercuric acetate. Perchloric acid. Potassium r-butoxide. Potassium hydride. Potassium hydroxide. Zinc dust. 

Rhodium complexes generated from the water-insoluble carboxylated surfactant phosphine 17 (n = 3, 5, 7, 9, 11) were used as catalysts in the micellar hydrogenation of a- and cyclic olefins, such as 1-octene, 1-dodecene, and cyclohexene, in the presence of conventional cationic or anionic tensides such as cetyltrimethylammo-nium bromide (CTAB) or SDS and co-solvents, e.g., dimethyl sulfoxide [15], After the reaction the catalyst was separated from the organic products by decantation and recycled without loss in activity. There is a critical relationship between the length of the hydrocarbon chain of the ligand 17 and the length and nature of the added conventional surfactant, for obtaining maximum reactivity. For example,... 

BROMURO de AZUFRE (Spanish) (13172-31-1) Combustible liquid. Reacts with moisture in air, steam, or oxidizers, emitting fumes of hydrogen bromide and sulfur dioxide. Reacts with water, forming hydrobromic acid and fumes of hydrogen bromide and sulfur dioxide. Violent reaction with strong oxidizers, chromyl chloride, diethylzinc, dimethyl sulfoxide, lead dioxide, nitric acid, potassium. Incompatible with hexafluoroisopropylide-neaminolithium, iron sulfide, nickel, red phosphorus. Attacks most metals in the presence of moisture. 

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