Tris hydrazine

Kordesch was not the only person, nor was he the first, to try hydrazine for fuel cell power. Others had the same idea. In the 1960s, the now-defunct Allis-Chalmers Manufacturing Company built a small 3-kilowatt golf cart powered by that exotic fuel. Earlier, Monsanto Research Corporation developed a 20-kW hydrazine-air alkaline fuel cell system for a 3A-ton Army truck. In 1972, Shell Research in England put a 10-kW hydrazine-air system in a Dutch-built DAF-44 car. In 1982, according to Kordesch s book,... 

Raju, B. and Sivasankar, B.N. (2009) Spectral, thermal, and X-ray studies on some new bis and tris-hydrazine and hydrazinium metal pyruvates. Journal of Thermal Analysis and Calorimetry, 98, 371-376. 

The azido mesylate may also be reduced with lithium aluminum hydride in the same manner as previously described for iodo azide reductions. The sodium borohydride/cobalt(II)tris(a,a -dipyridyl)bromide reagent may be used, but it does not seem to offer any advantages over the more facile lithium aluminum hydride or hydrazine/Raney nickel procedures. 

Sorm et a/. prepared azacytidine and some of its derivatives in a similar way. The 4-thio derivative was obtained from 2, 3, 5 -tri-0-acetyl- or 2, 3, 5 -tri-0-benzoyl-6-azauridine by treatment with phosphorus pentasulfide this liberated 4-thio-6-azauridine (126) which was identified with 4-thio-6-azauracil on comparing the UV spectra. Treatment with ammonia produced 6-azacytidine (127) treatment with hydrazine, hydroxylamine, and n-butylamine yielded the corresponding derivatives. 

It was found that the reaction of the lactone glycosides (5/ )- and (5S)-5-methoxy-5-(2,3,5-tris-(9-benzoyl-/3-D-ribofuranosyl)-2(5//)-furanone270and271 with hydrazine hydrate in methanol gave two products the pyridazinone 272 and a mixture of diastereomeric A -aminopyrrolinones 273, which could not be separated, in yields of 26 and 71%, respectively (Scheme 70) (87JOC4521). 

Triarylpyrylium salts react with hydrazine to give 4//-l,2-diazepines 472-1°s,ioo vja g unstable intermediates 3.110 The reaction fails with pyrylium salts containing alkyl groups in positions 2 and 6, with the exception of 2,4,6-tri-tert-butylpyrylium perchlorate. In some cases it is advantageous to use a thiapyrylium salt in place of the pyrylium salt. Selected examples are given. 

Reaction of hydrazine 823 with formic acid gave triazolo[3,4-c][ 1,2,4]tri-azine 824 and triazolo[5,l-r][l,2,4]triazine 825 [75BSF(2)864] (Scheme 167). 

Many of the salts which have been prepared are explosive and sensitive to heat or impact. These include chlorites of copper (violent on impact), hydrazine (monochlorite, inflames when dry), nickel (explodes at 100°C but not on impact), silver (at 105° or on impact), sodium, tetramethylammonium, mercury, thallium and lead (which shows detonator properties). Several other chlorites not isolated and unstable in solution include mono-, di- and tri-methylammonium chlorites. The metal salts are powerful oxidants [1], Chlorites are much less stable than the corresponding chlorates, and most will explode under shock or on heating to around 100°C [2], Individually indexed compounds are ... 

Dimethyl-2-trimethylsilylhy drazine, 2047 Lithium 2,2-dimethyltrimethylsilylhydrazide, 2041 3,3,6,6-Tetraphenylhexahydro-3,6-disilatetrazine, 3852 Triethylsilyl-l,2-bis(trimethylsilyl)hydrazine, 3586 Tris(trimethylsilyl)hydrazine, 3230... 

Spectral evidence" indicates an equilibrium between tetrahedral and octahedral Co" in iViV-dimethylacetamide and the equilibrium constant for [Co (tet)]/[Co (oct)] is reported at various temperatures. The complexes of acetylhydrazine (A), [CoA3]X2 (X = Cl or Br) and [Co(NCS)2A2]H20 and the tri-N-deuterio-analogue[Co(NCS)2(Ad3)2]D20 have been isolated and examined by i.r. Cationic complexes of JV-acyl hydrazines have been isolated with ligands in their keto-form, RCO-NH-NH2 however, the ligands also react in their enol form, RC(OH) = NNH2, forming neutral complexes (R = Me, Pr", Pr , or Ph). ... 

In the presence of the hydrogen donor tri-Af-butyltin hydride, only hydroxamic ester 195 is formed and the reaction is presumed to involve N—O bond homolysis to give the resonance-stabilized Af-alkoxyamidyl radicals (198), which in the presence of BusSnH are reduced to hydroxamic ester according to Scheme 30. In the absence of BusSnH hydride, formation of esters probably involves alkoxyamidyl dimerization to hydrazines (199) as intermediates (see Section Vl.C, Scheme 34), although HERON reactions of 194 with production of methoxynitrene cannot be discounted. Mesityl radicals, formed by the... 

In view of its importance, reductive dissolution of Fe oxides has been widely studied. Reductants investigated include dithionite, thioglycolic acid, thiocyanate, hydrazine, ascorbic acid, hydroquinone, H2S, H2, Fe ", tris (picolinato) V", fulvic acid, fructose, sucrose and biomass/bacteria (Tab. 12.3). Under the appropriate conditions, reductive dissolution may also be effected photochemically. As with protonation, the extent of reduction may be strongly influenced by ligand and proton adsorption on the oxide surface. 

The formation of a ruthenium vinylidene is proposed as the key intermediate in the regioselective addition of hydrazine to terminal alkynes [55]. This reaction, which proceeds via addition of the primary amino group of a 1,1-disubstituted hydrazine followed by deamination, provides an unprecedented access to a variety of aromatic and aliphatic nitriles. The tris(pyrazolyl)borate complex RuCl(Tp)(PPh3)2 gave the best catalytic activity in the absence of any chloride abstractor (Scheme 10.17). 

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