Hydrochloric Acid → 2-(3,4-dichlorophenyl)pent-4-enoic Acid

HRID 2401877Notes

Reaction equation

HRID 2401877 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([CH:9]([CH2:14][CH:15]=[CH2:16])[C:10]([O:12]C)=[O:11])[CH:5]=[CH:6][C:7]=1[Cl:8].O.[OH-].[Li+].Cl>O1CCCC1.O>[Cl:1][C:2]1[CH:3]=[C:4]([CH:9]([CH2:14][CH:15]=[CH2:16])[C:10]([OH:12])=[O:11])[CH:5]=[CH:6][C:7]=1[Cl:8]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 168937Lithium hydroxide, monohydrateHCID 11807390Methyl 2-(3,4-dichlorophenyl)pent-4-enoate

Product 1

HCID 110102122-(3,4-dichlorophenyl)pent-4-enoic Acid

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of methyl 2-(3,4-dichlorophenyl)pent-4-enoate (2.47 g, 9.53 mmol) in tetrahydrofuran (15.0 mL) was added a solution of lithium hydroxide monohydrate (2.00 g, 47.6 mmol) in water (15.0 mL). The mixture was vigorously stirred at rt for 12 hrs. The resulting mixture was acidified by addition of 12.0 M of hydrochloric acid in water (3.97 mL, 47.6 mmol) at 0° C., and extracted with EtOAc (×3). The combined organic layer was dried and concentrated to provide 2-(3,4-dichlorophenyl)pent-4-enoic acid as a yellow syrup (2.65 g, quantative). 1H NMR (400 MHz, CDCl3) δ 7.45-7.35 (m, 2H), 7.21-7.11 (dd, J=8.3, 2.1 Hz, 1H), 5.76-5.59 (ddt, J=17.0, 10.2, 6.8 Hz, 1H), 5.14-4.99 (m, 2H), 3.65-3.56 (t, J=7.7 Hz, 1H), 2.88-2.74 (dt, J=14.8, 7.5 Hz, 1H), 2.58-2.43 (dt, J=14.3, 6.9 Hz, 1H).

Workup

  1. extractionextracted with EtOAc (×3)
  2. customThe combined organic layer was dried
  3. concentrationconcentrated

Sources & evidence

ORD record
ord-16ebf0c07aa74a06be55c60bb0c90be8
Source dataset
uspto-grants-2014_08
Patent number
US08796268B2

Reaction notes

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