Ureas

Although urea is commonly used in the denaturation and solubilization of proteins, urea is also a key component in several synthetic organic reactions. For example, urea has been applied as a derivatization reagent for aldehydes and ketones producing crystalline compounds with characteristic melting points. Urea is also employed in the methylation of carboxylic acids, phenols, thiols, β-diketones, amino acids and amines. Other uses include Rh2(esp)2 catalyzed oxidative C–H activation, amination, and oxidative cyclization, condensation with an aldehyde in the Biginelli reaction, and urea-derivatized side chains to serve as metal ligating moieties.

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Rh2(esp)2 Catalyst
Biginelli Reaction
C – H Amination
Task-Specific Ionic Liquids

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U5128 Urea ACS reagent, 99.0-100.5% CH4N2O
U0631 Urea BioXtra, pH 7.5-9.5 (20 °C, 5 M in H2O) CH4N2O
S2201 Semicarbazide hydrochloride ≥99% CH5N3O · HCl
1.07722 Semicarbazide hydrochloride GR for analysis CH5N3O · xHCl
84940 Semicarbazide hydrochloride purum p.a., ≥98.0% (AT) CH5N3O · HCl
8.14217 N-Formylurea for synthesis C2H4N2O2
8.02491 1-Cyanoguanidine for synthesis C2H4N4
15270 Biuret 98% C2H5N3O2
M86804 N-Methylurea 97% C2H6N2O
M53701 o-Methylisourea bisulfate 99% C2H6N2O · H2SO4
455598 O-Methylisourea hemisulfate salt 99% C2H6N2O · 0.5 H2SO4
273457 N-Guanylurea sulfate salt hydrate 97% C2H6N4O · 0.5H2O4S · xH2O
CDS019843 1-Amino-3-methylurea AldrichCPR C2H7N3O
CDS000493 N-(2-Chloroethyl)urea AldrichCPR C3H7ClN2O
261394 1,1-Dimethylurea 99% C3H8N2O
15450 N,N′-Dimethylurea (sym.), ≥99% (from N) C3H8N2O
40410 N,N′-Dimethylurea (sym.), ≥95.0% (HPLC), technical C3H8N2O
8.03244 N,N′-Dimethylurea for synthesis C3H8N2O
D6254 N,N′-Dimethylurea ~98% C3H8N2O
8.20509 N,N-Dimethylurea for synthesis C3H8N2O
E51007 N-Ethylurea 97% C3H8N2O
554693 (2-Hydroxyethyl)urea 95% C3H8N2O2
D4879 N,N′-Bis(hydroxymethyl)urea ≥95% C3H8N2O3
92468 N,N′-Trimethyleneurea ≥98.0% C4H8N2O
A36808 N-Allylurea 95% C4H8N2O
259454 1,1-Diethylurea 97% C5H12N2O
D101087 1,3-Diethylurea 97% C5H12N2O
B103004 N-Butylurea 99% C5H12N2O
19939 N-tert-Butylurea ≥97.0% C5H12N2O
T24503 Tetramethylurea 99% C5H12N2O
8.21897 N,N,N′,N′-Tetramethylguanidine for synthesis C5H13N3
8.02301 1,1′-Carbonyldiimidazole for synthesis C7H6N4O
P36959 N-Phenylurea 97% C7H8N2O
245909 1-Phenylsemicarbazide 99% C7H9N3O
221600 4-Phenylsemicarbazide hydrochloride 99% C7H9N3O · HCl
226106 1,3-Bis(trimethylsilyl)urea 95% C7H20N2OSi2
15248 N,N′-Bis(trimethylsilyl)urea purum, ≥97.0% (N) C7H20N2OSi2
8.01795 N-Benzylurea for synthesis C8H10N2O
226408 o-Methyl-N,N′-diisopropylisourea 97% C8H18N2O
D2425 Diuron ≥98% C9H10Cl2N2O
CDS020259 2′-o-Methyluridine AldrichCPR C10H14N2O6
105937 3,4,4′-Trichlorocarbanilide 99% C13H9Cl3N2O
390151 1,3-Bis(4-nitrophenyl)urea 97% C13H10N4O5
142158 1,3-Diphenylurea 98% C13H12N2O
1.03091 1,5-Diphenylcarbazide GR for analysis and redox indicator ACS,Reag. Ph Eur C13H14N4O
D80800 N,N′-Dicyclohexylurea 98% C13H24N2O
372900 3-Methyl-1,1-diphenylurea ≥95.0% C14H14N2O
CDS001478 1-Benzyl-5-phenylbarbituric acid AldrichCPR C17H14N2O3
372889 1,3-Diethyl-1,3-diphenylurea 99% C17H20N2O
328030 1,3-Dioctadecylurea 97% C37H76N2O
1.03087 1,5-Diphenylcarbazone (cont. 50 % Diphenylcarbazid) ACS,Reag. Ph Eur