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Next, methanol (31 ml) and acetic acid (0.71 ml, 12.4 mmol) were added to benzyl 3-(4-pyridyl)-2-butenate (1.75 g, 6.20 mmol), and a nitrogen gas was bubbled through the mixture at room temperature for 10 minutes. A catalytic amount of 10%-palladium on carbon was added to the mixture, and the whole was stirred under a hydrogen atmosphere at room temperature overnight. The resulting insoluble matter was filtered out, and the filtrate was concentrated under reduced pressure. The resulting crystals were filtered off with acetone to give 3-(4-pyridyl)butyric acid (0.61 g, 60%) as pale yellow crystals.

1. customa nitrogen gas was bubbled through the mixture at room temperature for 10 minutes
2. additionA catalytic amount of 10%-palladium on carbon was added to the mixture
3. filtrationThe resulting insoluble matter was filtered out
4. concentrationthe filtrate was concentrated under reduced pressure
5. filtrationThe resulting crystals were filtered off with acetone