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Old Apr 5th 2014, 08:35 AM   #1
wrl281
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Ring formation problem

http://imgur.com/D49GHpq
I'm fairly confused as to how C makes D, I'm guessing it's the major product as it has something to do with carbocation stability? I've drawn out a mechanism for forming B by protonating the ring and then that being attacked by the double bond but I can't see how it would be the other way round. Many thanks if you can help!
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