Sodium Sulfite → (Z)-2-Carbomethoxy-3-phenyl-2-propene-1-sulfonic Acid Sodium Salt

HRID 1646910Notes

Reaction equation

Br[CH2:2]/[C:3](/[C:11]([O:13][CH3:14])=[O:12])=[CH:4]\[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1.[S:15]([O-:18])([O-:17])=[O:16].[Na+:19].[Na+].[Br-].[Na+].[K+].[Br-]>CO>[Na+:19].[C:11](/[C:3](=[CH:4]/[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)/[CH2:2][S:15]([O-:18])(=[O:17])=[O:16])([O:13][CH3:14])=[O:12]

Participants

Conditions

Temperature: 50 °C

Procedure

To a 12L, 3-neck round bottom flask fitted with a mechanical stirrer, thermometer and an addition funnel was added the resultant product from Example 3B (400 g, 1.57 mol) and methanol (4L). The mixture was warmed to 50° C. and a solution of sodium sulfite (199 g, 1.57 mol) dissolved in water (4L) was added over 75 min while the internal temperature of the flask was maintained at 50° C. After the addition was complete, the clear solution was allowed to stir at 50° C. for an additional 45 min. The reaction mixture in solution was taken to the next step without additional purification. The compound can be isolated by concentration to an amorphous powder, which is contaminated with an equivalent of sodium bromide: IR (KBr) 1711, 1628, 1215 cm-1 ; 1H NMR (DMSO D-6) delta 3.70 (s, 3H), 3.77 (s, 2H), 7.33-7.41 (m, 3H), 7.48 (s, 1H), 7.87-7.89 (m, 2H); 13C NMR (75 MHz, DMSO D-6) delta 49.88, 51.93, 127.36, 128.33, 128.91, 129.82, 134.75, 139.06, 168.60.

Workup

additionwas added over 75 min while the internal temperature of the flask
temperaturewas maintained at 50° C
additionAfter the addition
customThe reaction mixture in solution was taken to the next step without additional purification
customThe compound can be isolated by concentration to an amorphous powder, which

Sources & evidence

ORD record: ord-faf53b1c1c894e8aa60dddd57e40c7ca
Source dataset: uspto-grants-1993_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05182266

Reaction notes

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