“…The dichloro product (6) was shown to have a different GC retention time than obtained by the chlorination of resorcinol. That product, assigned the -dione structure (7), by Boyce and Hornig (10), gives an identical mass spectrum (Figure 2) [via loss of dichloroketene; 166 (37), 164 (59), 138 (61), 136 (100), 110 (39), 108 (26), 82 (46), 73 (82), 54 (70)] to that product obtained either by chlorination of 1,3-cyclopentenedione or by the reaction of 1 or 2 with chlorine dioxide.…”