The Stereochemistry of the Reaction of α-Silyl Lithium Reagents with Cyclic Tert-butyldimethylsilyl Acyloins

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• 4a (n=0); 4b (n=1); 4c (n=2); 5a (n=0, Y=Ph); 5b (n-0, Y=SPh); 5c (n=0, Y=CN); 5d (n=1, Y=Ph); 5e (n=1, Y=SPh); 5f (n=1, Y=CN); 5g (n=2, Y=Ph), 5h (n=2, Y=SPh); 5i (n=2, Y=CN). Chemical shifts, δ, for the vinyl protons: (Z) 5a 6.40, (E) 5a 6.48; (Z) 5b 6.21, (E) 5b 6.13; (Z) 5c 5.34, (E) 5c 5.29; (Z) 5d 6.65, (E) 5d 6.49; (Z) 5e 5.84, (E) 5e 6.28; (Z) 5f 5.01, (E) 5f 5.41; (Z) 5g 6.71, (E) 5g 6.50; (Z) 5h 5.88, (E) 5h 5.57; (Z) 5i 5.08, (E) 5i 5.51
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