... Tetrahedron Letters. Volume 53, Issue 4, 25 January 2012, Pages 373–376. Cover image Cover image. ... 22 and 23 In some preparations small amounts of another regioisomer 1-bromo-4-ethyl- 2,3-dimethoxybenzene were formed. ... IRCS Med. Sci., 11 (1983), p. 304. ...