The determination of phenolic hydroxyl values (semi-micro method)

Autor:	H. R. Thomas, H. Brunner
Rok vydání:	2008
Předmět:	Hydrolysis chemistry.chemical_compound Neutral red Chemistry Acetylation Scientific method Organic chemistry Phenols Phenolphthalein
Zdroj:	Journal of Applied Chemistry. 3:49-54
ISSN:	1934-998X 0021-8871
DOI:	10.1002/jctb.5010030110
Popis:	The various factors affecting the accuracy and procedure of hydroxyl determination are discussed. Phenolic acetates have been found to hydrolyse fairly rapidly during the hydrolysis of anhydrides, a process which is normally carried out at the end of the acetylation reaction, and this is held to account for anomalous hydroxyl values obtained previously for phenolic substances. A satisfactory semi-micro procedure has been developed for use with samples of phenols (20 to 80 mg.). In determining the acid values of phenols and phenolic-resin intermediates the use of phenolphthalein as indicator is to be avoided. Neutral red is suggested as a suitable indicator.
Databáze:	OpenAIRE
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