Dimethylhydrazine, reaction

Alder diadduct, 108 3,4-Dimethylhexane, 169 A, A -Dimethylhydrazine, reaction with MA, 84 )3(2,4-Dimethyl-6-hydroxybenzoyl)acrylic acid, 94 )3(2,6-Dimethyl-4-hydroxybenzoyl acrylic acid, 94 Dimethylmaleic acid, 238 Dimethylmaleic anhydride alternating copolymerization, 307 diazoalkane adducts, 222 MA in synthesis, 238 photochemical reactions, 182 polymerization attempts, 263 Dimethylmaleimide,A-(2-pyradinyl), MA in synthesis, 238... 

The determination of organic compounds by their direct catalytic effect on indicator reaction rates is a relatively unexplored ai ea promising valuable analytical chai acteristics, as we have recently shown in the determination of traces of unsymmetrical dimethylhydrazine (UDMH) by the oxidation of 3,3, 5,5 -tetramethylbenzidine (TMB) by atmospheric oxygen initiated with persulfate [1]. 

The thionitrosyl group may be stabilized either by a dimethylamino substituent or by the use of a highly bulky ort/io-substituted aryl groups. Ai,A -Dimethylthionitrosoamine M2NNS is obtained as a low melting, deep purple solid from the reaction of 1,1-dimethylhydrazine with sulfur (Eq. 10.1) or by the reduction of Mc2NNSO with LiAlH4. This thermally unstable derivative is monomeric in solution. 

Diphenylisoinclole (29) can be prepared by a modified Leuckart reaction of o-dibenzoylbenzene (46), using an ammonium salt of formic acid the process is essentially a reductive alkylation of ammonia, accompanied by cyclization, and leads to 29 in 44% yield with ammonium formate, and 47 in 28% yield with methylammonium formate. 1,3-Diphenylisoindole. (29) can also be obtained in good yield by the reaction of 46 with 1,1-dimethylhydrazine. ... 

The reaction of 1-heterobut- l-en-3-ynes with nonsymmetric dimethylhydrazine furnished 1,5-dimethylpyrazole (111) (72ZOR651). 

Chemical Reactions. It burns with a luminous flame and is readily expld (Ref 2). It is reduced with Zn dust and Na hydroxide to dimethyl hydrazine (Ref 2). Action of coned HC1 forms methylhydrazine and formaldehyde (Ref 2). Treatment in anhyd eth with Na metal forms a solid adduct which gives dimethylhydrazine on addn of w (Ref 4). For a review of thermal and photochem reactions see Ref 8 Explosive Limits. In mixts with air the crit press at which exp] occurs varies inversely with temp betw 350 and 380° (Ref 6)... 

Gas Phase Reactions of iV iV-Dimethylhydrazine with Ozone and NO in Simulated Atmospheres... 

MRH Ammonia, 5.86/25, aniline 6.44/17, dimethylhydrazine 6.69/19 Ammonia dissolved in 99.6% peroxide gave an unstable solution which exploded violently [1]. In the absence of catalysts, cone, peroxide does not react immediately with hydrazine hydrate. This induction period has caused a number of explosions and accidents owing to sudden reaction of accumulated materials [2], 1,1-Dimethylhydrazine is hypergolic with high-test peroxide [3],... 

The pyridotriazines 21 and 22 were obtained (84JHC1765) by the cycliza-tion of the 2-chlorolpropargyl pyridinium bromide 20 with methylhydra-zine or 1,2-dimethylhydrazine, respectively. On the other hand, when hydrazine or acetylhydrazine were used in the reaction, imidazopyridin-ium salts were formed. 

The methyl radieal CCH3) is generated from a variety of methyl hydrazines and hydroperoxidesfollowing oxidative metabolism." Direct attachment of CHs to the C8-position of dG generates 8-Me-dG (Fig. 3) from rats administered with 1,2-dimethylhydrazine (DMH)" or from reaction of t-BOOH and Fe(II) with calf thymus Formation of 8-Me-dG provides in vivo evidence for DNA... 

The reaction of 1,1-dimethylhydrazine with O, gave the carcinogen A,A-dimethylnitrosamine as the major product in 60% yields within 2- to 3-min reaction time (Tuazon et al., 1981). Minor products were HCHO, H202, HONO, and perhaps NOc. For a discussion of the complex mechanisms, the reader should consult the original reference. 

The monocyclic system (606) has been prepared by the reaction of the Af-chlorosulfonyl /3-lactam (605) with 1,2-dimethylhydrazine (75CB2137). 

Dimethylhydrazine dihydrochloride is dried at 80°C/0.1 torr for 2h before transferring to the reaction flask under nitrogen atmosphere. A 1-L, three-necked, round-bottomed flask fitted with a mechanical stirrer and water condenser is charged with dry nitrogen. 1,2-dimethylhydrazine dihydrochloride (50 g, 0.375 mol) and phosphorus trichloride (320 mL, 3.78 mol) is... 

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