Selenourea

Structural formula
General
Surname	Selenourea
Molecular formula	C.H 4 N 2 Se
Brief description	white crystalline solid
External identifiers / databases
CAS number 630-10-4 EC number 211-129-9 ECHA InfoCard 100.010.119 PubChem 6327594 Wikidata Q1786341
properties
Molar mass	123.02 g mol −1
Physical state	firmly
Melting point	215 ° C (decomposition)
solubility	moderately soluble in hot water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 301-331-373-410 P: 261-273-301 + 310-311-501
Toxicological data	50 mg kg −1 ( LD 50 ,  rat ,  oral )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Selenourea is a derivative of urea in which the oxygen atom is substituted by a selenium atom .

synthesis

Selenourea can be produced from the starting materials calcium cyanamide and selenium hydrogen .

${\displaystyle \mathrm {CaCN_{2}+H_{2}Se+2\,H_{2}O\rightarrow SeC(NH_{2})_{2}+Ca(OH)_{2}} }$

use

Selenourea is used to prepare selenazoles . The reaction with α-haloketones produces 2-amino-4-alkylselenazoles. The reaction of α-halocarboxylic acids with selenourea leads to 2-amino-4-selenazolones.

Derived connections

• Ethyl selenourea
• Allyl selenourea
• Phenyl selenourea
• Benzyl selenourea

See also

• Thiourea

Individual evidence

1. ↑ ^{a b} Data sheet selenourea at AlfaAesar, accessed on March 8, 2010 ( PDF )(JavaScript required) .
2. ^ ^{A b c d} Heinrich Rheinboldt in Houben-Weyl Methods of Organic Chemistry , edited by Eugen Müller, Otto Bayer , Hans Meerwein and Karl Ziegler , Volume 9, sulfur , selenium and tellurium compounds , Thieme Verlag, Stuttgart, 1955, p 1187-1188.
3. ↑ ^{a b} Data sheet Selenourea from Sigma-Aldrich , accessed on October 22, 2016 ( PDF ).
4. ^ ^{A b c d} Heinrich Rheinboldt in Houben-Weyl Methods of Organic Chemistry , edited by Eugen Müller, Otto Bayer, Hans Meerwein and Karl Ziegler, Volume 9, sulfur, selenium and tellurium compounds , Thieme Verlag, Stuttgart, 1955, p 1189-1190.