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![[Post New]](/templates/default/images/icon_minipost_new.gif) 8 Apr 2008 22:40:50 IST
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you get a four membered ring by substitution in other places.......
whereas this substitution leads to a five membered ring which is more stable.......
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this reply: 12 points
(with 2 
in 3 votes ) [?]
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