Guanidine, -, sulfate

In the commonly used Welland process, calcium cyanamide, made from calcium carbonate, is converted to cyanamide by reaction with carbon dioxide and water. Dicyandiamide is fused with ammonium nitrate to form guanidine nitrate. Dehydration with 96% sulfuric acid gives nitroguanidine which is precipitated by dilution. In the aqueous fusion process, calcium cyanamide is fused with ammonium nitrate ia the presence of some water. The calcium nitrate produced is removed by precipitation with ammonium carbonate or carbon dioxide. The filtrate contains the guanidine nitrate that is recovered by vacuum evaporation and converted to nitroguanidine. Both operations can be mn on a continuous basis (see Cyanamides). In the Marquerol and Loriette process, nitroguanidine is obtained directly ia about 90% yield from dicyandiamide by reaction with sulfuric acid to form guanidine sulfate followed by direct nitration with nitric acid (169—172). 

Chemical Name (1,4-Dioxaspiro[4.5l decan-2-ylmethyl)guanidine sulfate Common Name —... 

A mixture of 10.5 g of 1,4steam bath for 4 hours during which 2.0 g of methylmercaptan was collected in a dry ice bath connected to the reaction flask through a water cooled reflux condenser. The reaction mixture was then evaporated at 15 mm pressure to a solid residue which was then dissoived in 80 ml of 50/50 methanol-ethanol. The solution was filtered and evaporated to approximately 50 ml volume and allowed to cool and crystallize, giving a crop melting at 213.5°C to 215°C of 1,4[Pg.743]

The Ba[Pt(CN)4] -4H20 used in this preparation is synthesized and purified as described by Koch et al.3 This material is air dried for approximately 15 minutes before being used in the preparation. The guanidine sulfate is purchased from Eastman Kodak and is used without further purification. The bromine is reagent grade. Distilled water is used throughout. 

A portion of this weight is due to water, since the material is only air dried for 15 minutes after preparation. If the synthesis is performed with completely dried barium salt, difficulty is encountered in this step since all Ba[Pt(CN)4]-4H20 is not consumed by 4.14 g of guanidine sulfate. 

Another method of prepn listed in AMCP 706—177 is from ami no guanidine sulfate and Na nitrite in distd w... 

The guanidine sulfate, without removal from the mixture, is then nitrated to nitroguanidine.7 The process yields a nitroguanidine which is suitable for use in nitrocellulose powder, but it suffers from the disadvantages that the dicyandiamide, which corresponds after all to two molecules of cyanamide, yields in theory... 

Nitroguanidine is produced in variable amount, usually along with some of the a-compound, by the nitration of the mixture of guanidine sulfate and ammonium sulfate which results from the hydrolysis of dicyandiamide by sulfuric acid. Conditions have... 

Chemical Name [2-(Hexahydro-l(2H)-azocinyl)ethyl]guanidine sulfate Common Name -Structural Formula ... 

An alternative route is the reaction between ethyl aceto acetate with an amidine or with guanidine sulfate (or hydrochloride)... 

Dimethyl-3(2.2 dichloro vinyl) cyclopropane carboxilic acid (or ester) see DV acid Dimethyl guanidine sulfate dimethirimol, pirimicarb... 

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