Ahhhh. There is no benzene in this question. However I made my explanation rather vague.
However I think I have a plausible mechanism now.
And your explanatiom or other principles were very useful. I aways forget my good leaving groups.
As for my question. My tutor walked us through a ring closing question where H-Br formed a bromonium ion and a ring formed in a 5member (4 C, 1 O) as opposed to the expected 6 member markovnikov product for the reason that oxygen likes to be in 5 membered rings.
Last edited by Nebula; 04-17-2012 at 07:05 AM.