thracene which would be expected to lose hydrogen chloride readily (accounting for the hydrogen chloride observed in this reaction; see Experimental Section) to give 9- chloroanthracene. 6 9, 10-Dichloro-9, 10-dihy-droanthracene might also act as a source of hydrogen atoms for the reduction of 3 and/or 4 to 5. We have tested this by heating a mixture of 3 and 4 with 9, lO-dihydroanthracene (230, 1 day) and find that 3 and 4 are completely ...
