From its soap Frolicher has obtained acetic, valerianic, butyric and benzoic acids.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
If it is found to contain sufficient benzoic acid to react with a considerable proportion of the sodium alcoholate, a poor yield of ester will be obtained.
"Organic-Syntheses"
Conant, James Bryant
Less than 1 per cent of benzoic acid will not interfere seriously with the yields obtained, but the presence of larger quantities of acid will be found to be detrimental and must be removed by washing the benzaldehyde with a sodium carbonate solution and redistilling with the precautions necessary to prevent too free an access of air to the distillate.
"Organic-Syntheses"
Conant, James Bryant