cis-Addition in the Bromination of Bicyclic Olefins. The Structure and Stereochemistry of the Dibromides of exo-cis-3,6-Endoxo-Δ4-tetrahydrophthalic Anhydride and endo-cis-3,6-Endomethylene-Δ4-tetrahydrophthalic Anhydride1
cis-Addition in the Bromination of Bicyclic Olefins. The Structure and Stereochemistry of the Dibromides of exo-cis-3,6-Endoxo-Δ<sup>4</sup>-tetrahydrophthalic Anhydride and endo-cis-3,6-Endomethylene-Δ<sup>4</sup>-tetrahydrophthalic Anhydride<sup>1</sup>