
TY  - JOUR
A1  - Garten, VA 
A1  - Weiss, DE 
A1  - Willis, JB 
T1  - A new interpretation of the Acidic and Basic structures in Carbons. I. Lactone groups of the ordinary and fluorescein types in carbons
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1957
VL  - 10
IS  - 3
SP  - 295
EP  - 308
KW  - 
UR  - https://doi.org/10.1071/CH9570295 
N2  - Methylation of a sugar carbon or carbon black with diazomethane produces a methoxyl group which is readily hydrolysed by dilute acid but which is not due to the presence of a simple carboxylic ester, since the titration curves of the carbons are those of much weaker acids. It most probably arises from the methylation of a lactone which is present in conjunction with a phenol, such as occurs in the fluorescein and phthalein dyestuffs. This, however, accounts for only part of the acidity of the carbons, some of which is due to a group which reacts with alkali but not with diazomethane and is probably a normal lactone group. The remainder of the acidity of the carbons is due to phenolic hydroxyl groups. Infra-red spectroscopic evidence is presented in support of these views. The effects of temperature and of oxidation on the concentration of these various groups have also been studied. 
ER  -

