On the Julia Alkenylation Reaction in Vitamin D Synthesis. Isolation of Four Geometrical Isomers of Vitamin D 4 .-Reinvestigation of the coupling of sulfone (II) with aldehyde (III) using the Julia alkenylation procedure indicates that vitamin D 4 (IV) and its geometric isomers (V)-(VII) are formed in a 75:10:10:5 ratio, respectively. The building blocks (II) and (III) are prepared from vitamin D 2 (I). -(BLAKEMORE, P. R.; GRZYWACZ, P.; KOCIENSKI, P. J.; MARCZAK, S.; WICHA, J.; Pol.
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