ORGLIST: Nucleophilic Additions

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From: Ashutosh (ashujo$##$yahoo.com)
Date: Wed Dec 27 2000 - 12:26:37 EST

In Peter Sykes',"A Guidebook to mechanism in Organic Chemistry",it's given that nucleophilic additions to carbonyl compounds are quite reversible.
But a few lines later he says,"The T.S resembles the adduct more than the starting material".What do these lines mean?Are these reactions in general reversible or not,and if so,under what conditions?Does this relate to Hammond's Postulate in any way?
Thanks
Ashutosh S.Jogalekar

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