6-dione (2) with pyridinium bromide perbromide and sulfuryl chloride gave several α-halo-diones. The substituted positions and the stereochemistry of the halogen atoms have been assigned on the basis of their dehydrohalogenation and spectral data. The chlorination of 2 also gave a tricyclic dione (8) containing a cyclopropane ring. The structure of 8 was determined by means of 13C-NMR, as well as other