Citric Acid → N,N'-Dicyclohexylurea

HRID 975126Notes

Reaction equation

HRID 975126 reaction equation
C(O)(=O)CC(CC(O)=O)(C(O)=O)[OH:4].[CH:14]1([N:20]=[C:21]=[N:22][CH:23]2[CH2:28][CH2:27][CH2:26][CH2:25][CH2:24]2)[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]1>O1CCCC1>[C:21]([NH:20][CH:14]1[CH2:15][CH2:16][CH2:17][CH2:18][CH2:19]1)([NH:22][CH:23]1[CH2:28][CH2:27][CH2:26][CH2:25][CH2:24]1)=[O:4]

Participants

4

Reactant 2

HCID 311Citric AcidHCID 10868Dicyclohexylcarbodiimide

Product 1

HCID 4277N,N'-Dicyclohexylurea

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

Anhydrous citric acid (5 mmoles, 960 mg) and dicyclohexyl carbodiimide (10 mmoles, 2.06 g) were stirred in 30 ml anhydrous tetrahydrofuran for one hour. Dicyclohexylurea crystals formed during the ensuing dehydration reaction were removed by filtration, and the filtrate was dried in vacuo, yielding the dicitrate cyclic diester-containing solid residue.

Sources & evidence

ORD record
ord-9f0e625f94b04fc99d98ae9f20752195
Source dataset
uspto-grants-1997_03
Patent number
US05607964

Reaction notes

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