Sodium Hydroxide → Isoxepac

HRID 2082844Notes

Reaction equation

HRID 2082844 reaction equation
O=P12OP3(OP(OP(O3)(O1)=O)(=O)O2)=O.C1S(=O)(=O)CCC1.[C:22]([C:25]1[CH:42]=[CH:41][CH:40]=[CH:39][C:26]=1[CH2:27][O:28][C:29]1[CH:34]=[CH:33][C:32]([CH2:35][C:36]([OH:38])=[O:37])=[CH:31][CH:30]=1)([OH:24])=O.[OH-].[Na+]>C(O)C>[O:24]=[C:22]1[C:25]2[CH:42]=[CH:41][CH:40]=[CH:39][C:26]=2[CH2:27][O:28][C:29]2[CH:34]=[CH:33][C:32]([CH2:35][C:36]([OH:38])=[O:37])=[CH:31][C:30]1=2

Participants

6

Reactant 4

HCID 14798Sodium HydroxideHCID 14812Phosphorus oxide (P4O10)HCID 31347SulfolaneHCID 122923092-((4-Carboxymethylphenoxy)methyl)benzoic acid

Product 1

HCID 41448Isoxepac

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To 49 ml of absolute ethanol is added with vigorous stirring, 81 g of phosphorus pentoxide. After addition, the mixture is allowed to stir at 95°-100° C for 1 hour, 400 ml of tetramethylene sufone are added and the temperature is adjusted to 86°-90° C. Then, 38.5 g of 4-(2-carboxybenzyloxy)phenylacetic acid, Example 1, are added, the mixture is stirred for 4 hours and poured onto ice water. The aqueous mixture is made basic with sodium hydroxide and extracted with toluene. Cooling of the aqueous layer followed by acidification with concentrated hydrochloric acid gives light brown crystals. Recrystallization from acetic acid-water or from dimethoxyethane provides colorless crystals, mp 126°-128° C of 6,11-dihydro-11-oxodibenz[b,e]oxepin-2-acetic acid.

Workup

  1. additionAfter addition
  2. customis adjusted to 86°-90° C
  3. stirringthe mixture is stirred for 4 hours
  4. additionpoured onto ice water
  5. extractionextracted with toluene
  6. temperatureCooling of the aqueous layer
  7. customgives light brown crystals
  8. customRecrystallization from acetic acid-water

Sources & evidence

ORD record
ord-6536db37b1ea41c1a9b9c7ef24faddd5
Source dataset
uspto-grants-1978_04
Patent number
US04082850

Reaction notes

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