
TY  - JOUR
A1  - Merewether, JWT 
T1  - Studies on the Lignin of <I>Eucalyptus regnans</I>. II. The Nature of the Hydroxyl Groups and the Presence of the Carbonyl Group in Thiolignin
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1948
VL  - 1
IS  - 2
SP  - 241
EP  - 248
KW  - 
UR  - https://doi.org/10.1071/CH9480241 
N2  - E. regnans thiolignin reacts with p-toluenesulphonyl chloride in pyridine to form a hexatosyl derivative ; its trimethyl ether reacts likewise to form a tritosyl derivative. Both compounds still have a free hydroxyl group which can be acetylated. Similarly they yield a hexabenzoate and tribenzoate respectively by the Schotten-Baumann reaction, but in pyridine, thiolignin reacts with benzoyl chloride to give a heptabenzoate and trimethylthiolignin a tetrabenzoate. No reaction takes place when trimethyl thiolignin is treated with triphenylchloromethane in pyridine. The above data are interpreted as evidence that of the four alcoholic hydroxyl groups three are secondary and one tertiary.   With phenylhydrazine, thiolignin yields a phenylosazone ; with p-nitrophenylhydrazine it yields a p-nitrophenylhydrazone. On the other hand, trimethylthiolignin does not react with phenylhydrazine, indicating the absence of non-enolizable carbonyl groups. Thiolignin condenses with benzaldehydes indicating the presence of an active methylene group. From this evidence it is deduced that the grouping CH2-CO-CHOH- is present. 
ER  -

