Summary Aromatic nitrochloro compounds containing a nitro group ortho to the chlorine undergo dechlorination when heated with copper powder and an organic acid at 150-200°. A new syn- thesis of 1,3-dinitronaphthalene is described. IOWA CITY, IOWA RECEIVED MARCH 28, 1949 ... [CONTRIBUTION FROM THE COLLEGE OF PHARMACY, UNIVERSITY OF MICHIGAN] Derivatives of Thianaphthene. 111 ... BY FF BLICKE AND DON G. SHEET$