
TY  - JOUR
A1  - Calvert, JL 
A1  - Gordon, JLM 
A1  - Hartshorn, MP 
A1  - Robinson, WT 
A1  - Wright, GJ 
T1  - The Nitration of Tetrachlorocatechol and 3,4,6-Trichloro-5-methylcatechol. The Formation of 1-Hydroxycyclopent-3-enecarboxylic Acids
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1992
VL  - 45
IS  - 4
SP  - 713
EP  - 719
KW  - 
UR  - https://doi.org/10.1071/CH9920713 
N2  - Reaction of tetrachlorocatechol (la) with nitric acid (d 1.48) gives the ring-contracted hydroxy dinitro acid (4), which was isolated as its ether solvate. Similar nitration of 3,4,6-trichloro-5-methylcatechol (lb) gives a mixture of stereoisomeric hydroxy  dinitro acids (5), from which the methoxy methyl ester (8) can be isolated after methylation of the mixture with diazomethane. X-Ray crystal structure determinations are reported for the etherate of hydroxy  dinitro acid (4) and the methoxy methyl ester (8). 
ER  -

