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Cyanamide can be regarded as a functional single carbon fragment which can react as an electrophile or nucleophile. The main reaction exhibited by cyanamide involves additions of compounds containing an acidic proton. Water, hydrogen sulfide, and hydrogen selenide react with cyanamide to give urea, thiourea, and selenourea, respectively:
The global annual production of thiourea is around 10,000 tonnes. About 40% is produced in Germany, another 40% in China, and 20% in Japan. Thiourea can be produced from ammonium thiocyanate, but more commonly it is manufactured by the reaction of hydrogen sulfide with calcium cyanamide in the presence of carbon dioxide. [7]
N,N′-unsubstituted thioureas can be prepared by treating the corresponding cyanamide with hydrogen sulfide or similar sulfide sources. [4] Organic ammonium salts react with potassium thiocyanate as the source of the thiocarbonyl (C=S). [5] Alternatively, N,N′-disubstituted thioureas can be prepared by coupling two amines with thiophosgene: [6]
Hydrogen sulfide is a chemical compound with the formula H 2 S.It is a colorless chalcogen-hydride gas, and is poisonous, corrosive, and flammable, with trace amounts in ambient atmosphere having a characteristic foul odor of rotten eggs. [11]
The conversion is conducted in slurries. For this reason, most commercial calcium cyanamide is sold as an aqueous solution. Thiourea can be produced by the reaction of hydrogen sulfide with calcium cyanamide in the presence of carbon dioxide. [15] Calcium cyanamide is also used as a wire-fed alloy in steelmaking to introduce nitrogen into the ...
Magnesium cyanamide – MgCN 2; Magnesium fluoride – MgF 2; ... Hydrogen sulfide (sulfane) – H 2 S; Pyrosulfuric acid – H 2 S 2 O 7; Sulfamic acid – H 3 NO 3 ...
hydrogen sulfide chemosynthesis: [1] 18H 2 S + 6CO 2 + 3 O 2 → C 6 H 12 O 6 (carbohydrate) + 12H 2 O + 18 S. In the above process, hydrogen sulfide serves as a source of electrons for the reaction. [6] Instead of releasing oxygen gas while fixing carbon dioxide as in photosynthesis, hydrogen sulfide chemosynthesis produces solid globules of ...
A scenario is a set of related concepts pertinent to the origin of life (abiogenesis), such as the iron-sulfur world.Many alternative abiogenesis scenarios have been proposed by scientists in a variety of fields from the 1950s onwards in an attempt to explain how the complex mechanisms of life could have come into existence.