[OH-].[K+:2].[C:3]([OH:15])(=[O:14])/[CH:4]=[CH:5]/[C:6]1[CH:13]=[CH:12][C:10]([OH:11])=[C:8](O)[CH:7]=1>>[OH:11][C:10]1[CH:8]=[CH:7][C:6]([CH:5]=[CH:4][C:3]([O-:15])=[O:14])=[CH:13][CH:12]=1.[K+:2]To 15 mL of a 0.002 mM aqueous solution of potassium hydroxide was slowly added 5 g coumaric acid 190 (30 mmol) with mixing at 60-70° C. The resulting potassium coumarate (200) was dried under vacuum at 30-40° C.
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