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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U0631 Urea BioXtra, pH 7.5-9.5 (20 °C, 5 M in H2O) CH4N2O
U5128 Urea ACS reagent, 99.0-100.5% CH4N2O
84940 Semicarbazide hydrochloride purum p.a., ≥98.0% (AT) CH5N3O · HCl
S2201 Semicarbazide hydrochloride ≥99% CH5N3O · HCl
15270 Biuret C2H5N3O2
B54207 Biuret 97% 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
D6254 N,N′-Dimethylurea ~98% C3H8N2O
15450 N,N′-Dimethylurea (sym.), ≥99% (from N) C3H8N2O
40410 N,N′-Dimethylurea (sym.), ≥95.0% (HPLC), technical 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
87849 Tetramethylurea ≥99.5% (GC) C5H12N2O
T24503 Tetramethylurea 99% C5H12N2O
CDS000567 N-(2-Bromo-3-methylbutanoyl)urea AldrichCPR C6H11BrN2O2
CDS010709 3-fluorophenylurea AldrichCPR C7H7FN2O
P36959 N-Phenylurea 97% C7H8N2O
245909 1-Phenylsemicarbazide 99% C7H9N3O
79150 4-Phenylsemicarbazide puriss., for the detection of aldehydes and ketones, ≥98.5% (N) C7H9N3O
221600 4-Phenylsemicarbazide hydrochloride 99% C7H9N3O · HCl
CDS001428 3-(2-Hydroxyethyl)-6-methyluracil AldrichCPR C7H10N2O3
417629 N,N′-Dipropylurea 97% C7H16N2O
226106 1,3-Bis(trimethylsilyl)urea 95% C7H20N2OSi2
15248 N,N′-Bis(trimethylsilyl)urea purum, ≥98.0% (N) C7H20N2OSi2
CDS010583 4-(trifluoromethoxy)phenylurea AldrichCPR C8H7F3N2O2
CDS000094 2-Formyl-N-phenylhydrazinecarboxamide AldrichCPR C8H9N3O2
B1278 Benzyloxyurea C8H10N2O2
CDS020277 2-Methyl-2-([(prop-2-en-1-yl)carbamoyl]amino)propanoic acid AldrichCPR C8H14N2O3
66638 N,N′-Diisopropyl-O-methylisourea purum, ≥97.0% (GC) C8H18N2O
226408 o-Methyl-N,N′-diisopropylisourea 97% C8H18N2O
CDS016519 N-[3-(trifluoromethyl)benzyl]urea AldrichCPR C9H9F3N2O
D2425 Diuron ≥98% C9H10Cl2N2O
332992 3-(4-Chlorophenyl)-1,1-dimethylurea 99% C9H11ClN2O
CDS016000 N-(2-chloroethyl)-N′-[4-(methylthio)phenyl]urea AldrichCPR C10H13ClN2OS
CDS020259 2′-o-Methyluridine AldrichCPR C10H14N2O6
427527 Methyl 2-[3-(2-chloroethyl)ureido]benzoate 98% C11H13ClN2O3
105937 3,4,4′-Trichlorocarbanilide 99% C13H9Cl3N2O
390151 1,3-Bis(4-nitrophenyl)urea 97% C13H10N4O5
142158 1,3-Diphenylurea 98% C13H12N2O
D80800 N,N′-Dicyclohexylurea 98% C13H24N2O
372900 3-Methyl-1,1-diphenylurea ≥95.0% C14H14N2O
CDS016466 N-(3-chlorophenyl)-N′-(2-hydroxy-1-phenylethyl)urea AldrichCPR C15H15ClN2O2
CDS001478 1-Benzyl-5-phenylbarbituric acid AldrichCPR C17H14N2O3
372889 1,3-Diethyl-1,3-diphenylurea 99% C17H20N2O
CDS000351 N-Octadecylurea AldrichCPR C19H40N2O
328030 1,3-Dioctadecylurea 97% C37H76N2O
1.08487 Urea Urea GR for analysis ACS,Reag. Ph Eur. CAS No. 57-13-6, EC Number 200-315-5., GR for analysis ACS,Reag. Ph Eur CH₄N₂O
8.18710 Urea Urea for synthesis. CAS No. 57-13-6, EC Number 200-315-5., for synthesis CH₄N₂O
1.07722 Semicarbazide hydrochloride Semicarbazide hydrochloride GR for analysis. CAS 563-41-7, EC Number 209-247-0, chemical formula CH₅N₃O * HCl., GR for analysis CH₆ClN₃O
8.20612 Guanidinium nitrate Guanidinium nitrate for synthesis. CAS 506-93-4, EC Number 208-060-1, chemical formula CH₅N₃ * HNO₃., for synthesis CH₆N₄O₃
8.40048 O-(1H-Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate O-(1H-Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate for synthesis. CAS 125700-67-6, molar mass 321.09 g/mol., for synthesis C₁₁H₁₆BF₄N₅O
8.43582 1,3-Diphenylurea 1,3-Diphenylurea for synthesis. CAS 102-07-8, molar mass 212.25 g/mol., for synthesis C₁₃H₁₂N₂O
8.40137 1,3-Diphenylguanidine 1,3-Diphenylguanidine for synthesis. CAS 102-06-7, pH 10.2 (10 g/l, H₂O)., for synthesis C₁₃H₁₃N₃
1.03091 1,5-Diphenylcarbazide 1,5-Diphenylcarbazide GR for analysis and redox indicator ACS,Reag. Ph Eur. CAS 140-22-7, chemical formula ((C₆H₅)NHNH)₂CO., GR for analysis and redox indicator ACS,Reag. Ph Eur C₁₃H₁₄N₄O
8.14217 N-Formylurea N-Formylurea for synthesis. CAS 1190-24-5, EC Number 214-719-4, chemical formula H₂NCONHCHO., for synthesis C₂H₄N₂O₂
8.02491 1-Cyanoguanidine 1-Cyanoguanidine for synthesis. CAS 461-58-5, chemical formula NCNHC(=NH)NH₂., for synthesis C₂H₄N₄
8.20800 N-Methylurea N-Methylurea for synthesis. CAS 598-50-5, EC Number 209-935-0, chemical formula CH₃NHCONH₂., for synthesis C₂H₆N₂O
8.21945 N-Amidinoglycine N-Amidinoglycine for synthesis. CAS 352-97-6, EC Number 206-529-5, chemical formula HN=C(NH₂)NHCH₂COOH., for synthesis C₃H₇N₃O₂
8.03244 N,N'-Dimethylurea N,N'-Dimethylurea for synthesis. CAS 96-31-1, EC Number 202-498-7, chemical formula CH₃NHCONHCH₃., for synthesis C₃H₈N₂O
8.20509 N,N-Dimethylurea N,N-Dimethylurea for synthesis. CAS 598-94-7, EC Number 209-957-0, chemical formula (CH₃)₂NCONH₂., for synthesis C₃H₈N₂O
8.41136 5-Chlorouracil 5-Chlorouracil for synthesis. CAS 1820-81-1, molar mass 146.53 g/mol., for synthesis C₄H₃ClN₂O₂
8.41698 4(6)-Aminouracil 4(6)-Aminouracil for synthesis. CAS 873-83-6, molar mass 127.1 g/mol., for synthesis C₄H₅N₃O₂
8.41470 Creatine monohydrate Creatine monohydrate for synthesis. CAS 6020-87-7, pH 6.9 (10 g/l, H₂O, 20 °C)., for synthesis C₄H₉N₃O₂ * H₂O
8.08205 Tetramethylurea Tetramethylurea for synthesis. CAS 632-22-4, EC Number 211-173-9, chemical formula (CH₃)₂NCON(CH₃)₂., for synthesis C₅H₁₂N₂O
8.21897 N,N,N',N'-Tetramethylguanidine N,N,N',N'-Tetramethylguanidine for synthesis. CAS 80-70-6, EC Number 201-302-7, chemical formula (CH₃)₂N₂C=NH., for synthesis C₅H₁₃N₃
8.02301 1,1'-Carbonyldiimidazole 1,1'-Carbonyldiimidazole for synthesis. CAS 530-62-1, pH 7.7 (50 g/l, H₂O, 20 °C)., for synthesis C₇H₆N₄O
8.07567 N-Phenylurea N-Phenylurea for synthesis. CAS 64-10-8, EC Number 200-576-5, chemical formula C₆H₅NHCONH₂., for synthesis C₇H₈N₂O
8.14120 4-Guanidinobenzoic acid hydrochloride 4-Guanidinobenzoic acid hydrochloride for synthesis. CAS 42823-46-1, chemical formula C₈H₉N₃O₂ * HCl., for synthesis C₈H₁₀ClN₃O₂
8.01795 N-Benzylurea N-Benzylurea for synthesis. CAS 538-32-9, EC Number 208-689-1, chemical formula C₆H₅CH₂NHCONH₂., for synthesis C₈H₁₀N₂O
1.03087 1,5-Diphenylcarbazone (cont. 50 % Diphenylcarbazid) ACS,Reag. Ph Eur