why use pyridinium perbromide instead of br2 Download Nov 26, 2015 — Had you started with (E)-stilbene instead of (Z)-stilbene, you would have gotten meso (1S, 2R) and meso (1R, 2S) isomers instead.. Determine the melting point of the compound (use a well-dried sample) ... Discuss the advantage of using perbromide of pyridinium bromide instead of bromine .... Mechanism: Lecture Suggestions: Expl..