Methyl carbazate

Phenyl-3,6-dihydro-l,3,4-oxadiazin-2-one (50) is a high temperature blowing agent used primarily for polycarbonates (qv). It is prepared by the reaction of a-hydroxyacetophenone and methyl carbazate (52), made from hydrazine and dimethyl carbonate (175) ... 

Methyl 2-butynoate, 55, 76 Methyl carbazate, 58, 102, 103, 106 METHYL (CARBOXYSULFAMOYL)-... 

Methylbutyl iso valerate, ml 77 Methyl tert-butyl ketone, h70 Methyl caprate, m226 Methyl caproate, m270 Methyl caprylate, m349 Methyl carbazate, m275... 

Methyl carbazate was prepared by the method of O. Diels.3 This reagent is available from Aldrich Chemical Company, Inc., under the name methyl hydrazinocarboxylate. All other chemicals used in this sequence were of the highest purity commercially available and were not further purified before use. 

Carbazic acid, 2-(l-cyanocyclohexyl)-, methyl ester (8) Hy-drazinecarboxylic acid, 2-(l-cyanocyclohexyl)-, methyl ester (9) (-) Methyl carbazate Carbazic acid, methyl ester (8) Hydrazinecar-boxylic acid, methyl ester (9) (6294-89-9)... 

Methyl acrylate, 58, 82 Methylallyl, chloride, 57, 36 p-Methylbenzenesulfonyl cyanide, 57, 89 Methyl bromide, 58,43 Methyl bromoacetate, 57, 60 Methyl carbazate, 58, 102, 103,106 Methyl chloride diphenyl-, 55, 94 Methyl chloride polystyrene, 56, 96 2-Wethylcyclohexanone, 57, 70 2-Methyl-2-cvclohexenone, 58, 158, 159, 162, 163... 

Methylbutyl isovalerate, ml 70 Methyl caprate, m218 Methyl caproate, m265 Methyl carprylate, m329 Methyl carbazate, m271 Methyl carbitol, m66... 

Triazolin-3-ones can be formed fromprimary amines in reaction withmethyl(ii)-iV-(ethoxymethylene) hydrazinecarboxylate, ° and the synthesis of the much-used 4-phenyl-l,2,4-triazoline-3,5-dione also starts from methyl carbazate, a final oxidation of 4-phenylurazole giving the carmine red crystalline product. ... 

A convenient synthesis of pyridazine-3,4-dicarboxylic acid based on [4 + 2] cycloaddition of an electron deficient diazadiene has been developed (Scheme 102) and carried out on a molar scale. The azadiene is generated in situ from the precursor (124) (prepared from diethyl oxaloacetate and methyl carbazate followed by chlorination with sulfuryl chloride) and trapped with ethyl vinyl ether. The regiospecific cycloaddition gives the tetrahydropyridazine (125) as a mixture of cis and trans isomers which, with bromine in acetic acid, are transformed into diethyl pyridazine-3,4-dicar-boxylate. Saponification gives the diacid in an overall yield of 52% <90JHC579>. In a similar approach from the readily available ethyl 2-chloro-3-oxobutanoate, an efficient route to ethyl 3-methylpyridazine-4-carboxylate has been developed which gives the product in 56% overall yield. This route is claimed to be a practical alternative to the radical ethoxycarbonylation of pyridazines <91JHC1043>. 

Methyl hydrazinecarboxylate Methyl carbazate C2HgN202 6294-89-9 90.081 73 108 2 s HgO, EtOH si bz I peth... 

NITRILES Acrylonitrile. N-Amino-4,6-diphenylpyridone. n-Hexylamine. Hydroxyl-amine hydrochloride. lithium diethylamide-Hexamethylphosphoric triamide. Methyl carbazate. Phenyl isocyanate. p-Toluenesulfonic acid. Trifluoromethanesulfonic an-... 

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