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p-Xylene의 디니트로화와 2,3-, 2,5- 및 2,6-dinitro-p-xylene의 효율적 분리
로 양(Yang Lu),장영동(Yurng dong Jahng) 대한약학회 2018 약학회지 Vol.62 No.5
A practical method for the preparation and separation of 2,3-, 2,5- and 2,6-dinitro-p-xylenes is described herein. The direct nitration of p-xylene with nitric acid (d 1.42) in the presence of sulfuric acid at 80oC afforded 2,3-, 2,5-, and 2,6- dinitro-p-xylenes in a ratio of 6.86:1:3.41, and the isomeric mixture could be readily separated by column chromatography on silica gel eluting with hexanes:EtOAc (19:1) as an eluent.