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Structure determination on 2-benzenesulphonyl-3-trimethylsilylbicyclo (3) d
emonstrates that the double bonds are pyramidalized in the exo direction. N
ucleophilic attack (conjugate reduction) on 3 parallels this pyramidalizati
on and occurs exclusively from the endo face. (C) 1999 Elsevier Science Ltd
. All rights reserved.