Thiourea synthesis
1synthesis methods
- Product Name:Thiourea
- CAS Number:62-56-6
- Molecular formula:CH4N2S
- Molecular Weight:76.12
Thiourea is manufactured by heating ammonium thiocyanate at 140-145°C
for about 4 hours; equilibrium is established when about 25% of the
thiocyanate is converted to thiourea.Thiourea may also be prepared by the interaction of cyanamide and hydrogen sulphide:
Thiourea closely resembles urea in that reaction with formaldehyde gives methylol derivatives and then resinous condensates which on continued heating yield network structures. Thiourea-formaldehyde resins are slower curing than urea-formaldehyde resins and the hardened products are more brittle and more water-resistant. At one time thiourea-formaldehyde resins were added to urea-formaldehyde resins to give mouldings and laminates with improved water-resistance. These mixed resins have now been largely superseded by melamine-formaldehyde resins which give products with better resistance to heat.
Thiourea closely resembles urea in that reaction with formaldehyde gives methylol derivatives and then resinous condensates which on continued heating yield network structures. Thiourea-formaldehyde resins are slower curing than urea-formaldehyde resins and the hardened products are more brittle and more water-resistant. At one time thiourea-formaldehyde resins were added to urea-formaldehyde resins to give mouldings and laminates with improved water-resistance. These mixed resins have now been largely superseded by melamine-formaldehyde resins which give products with better resistance to heat.
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Yield:-
Reaction Conditions:
with ammonia
References:
Sontakke, Madhuri M.;Jichkar, Atul A.;Dhonde, Madhukar G.;Bhaskar, Chandrakant S.;Berad, Baliram N. [Synthetic Communications,2014,vol. 44,# 3,p. 340 - 345] Location in patent:supporting information