2,3-Dimethylbenzothiophene [31317-17-6] M 212.3, m 69-70o, b 123-124o/10mm, n D 1.6171. Fractionate it through a 90cm Monel spiral column, or other efficient fractionating or spinning band column and collect the middle fraction. It has also been purified by chromatography on basic alumina using pentane as eluent. [Tedjanulia et al. J Heterocycl Chem 20 1485 1983, Beilstein 17 III/IV 161.]
