Sulfides glyoxalates

To obtain 2,5-bis(benzoxazol-2-yl)thiophene (39), two equivalents of 2-chloro-methylbenzoxazole are treated with sodium sulfide and the thiophene ring is formed with glyoxal hydrate [70] ... 

An acidic solution of 2,4-dinitrophenylhydrazine reacts with N-p-chlorophenyl-sulfonyl-3-ethoxy-l,2-thiazetidine 1-oxide to give (80%) the bis-2,4-dinitrophenyl-hydrazone of glyoxal. The adduct of A-sulfinyl-p-chlorophenylsulfonamide with dihydropyran is inert to catalytic hydrogenation and bromination. Treatment of two l,2-thiazetidine-3-one 1-oxides (e.g., 421) with hydriodic acid results in ring-cleavage and loss of sulfur. They are not oxidized to 1,1-dioxides by peracetic acid, ° but m-chloroperbenzoic acid accomplishes this oxidation. The unstable adducts with ketene decompose to amides with loss of hydrogen sulfide and sulfur dioxide or may be trapped by reaction with aromatic amines as shown for thiazetidine 1-oxide 422.An aldol-type condensation has been reported for A -cyclohexyl-1,2 thiazetidine-3-one 1-oxide and p-(A(A"-dimethylamino)benz-aldehyde. " Sulfur monoxide is lost in the flash-vacuum thermolysis of 422a. ... 

Treatment of diester 10 with diethyl oxalate in the presence of base gave the disodium salt 11, which was thereafter alkylated to afford the tetrasubstituted thiophene 12. This material was subsequently used as a precursor for preparation of 3,4-dimethoxythiophene 9 <04T10671>. In a similar series of reactions involving glyoxal and suitable sulfides, several cyclobutane substituted 2,5-diacylthiophenes were synthesized <04HC26>. 

Glyoxal. [HoechstCelanese/Colorants Surf.] Aliphatic dialdehyde hydrogen sulfide scavengors in natural gas and sour crude prod., textiles, paper, adhesives, coatings, disinfectants, deodcx-ants. 

Copper-based scavengers (formation of insoluble copper sulfide) Iron-oxide-based scavengers (formation of insoluble iron sulfide) Formaldehyde/methanol (formation of water-insoluble, cyclic thio compounds) Glyoxal (formation of thio acetals and other compounds)... 

This reaction has very broad application in organic synthesis, such as the formation of an aldehyde by hydrolysis of of-acyloxysulfide, the generation of vinyl sulfide by elimination of Qf-acyloxy group,and the synthesis of glyoxal from -ketosulfoxide. In addition, the formed vinyl sulfide has been used as an intermediate for many other reactions, such as Diels-Alder Cycloaddition and Michael Addition. ... 

Amyl acid phosphate Saccharin sodium anhydrous Saccharin sodium dihydrate accelerator, ripening sugarcane Glyoxalic acid accelerator, rubber Aniline 2-Benzothiazyl-N,N-diethylthiocarbamyl sulfide 2-Benzothiazyl-N-morpholine disulfide Benzyl chloride 1,3-Bis (2-benzothiazolylmercaptomethyl) urea Butyl 2-benzothiazole sulfenamide n-Butyraldehyde Cadmium... 

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