New synthetic methods. Stereocontrolled bicycloannulation: an

Cine Substitution in 2-Oxabicyclo[4.2.0]octanones and Subsequent Unusual Rearrangements. Alfred Hassner, Simha Naidorf-Meir, and Aryeh A. Frimer...
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J . Org. Chem., Vol. 43, No. 6, 1978 1031

Gibberellins the excess solvent was removed under reduced pressure to give 0.41 g of 18 as a light brown oil (>95% pure by GLC). An analysis of the carbonyl region of the I3C NMR spectrum of the crude product revealed it to be a mixture (ca. 1:l) of the C-1 epimers (6 219.03 and 217.67), together with another minor, unidentified component (