A new modification of Julia-Kocienski olefination reaction based on the use of cation-specific chelating agents that yields 1,3-dienes with predictable (E/Z)-selectivity on newly created double bond was developed. Influence of the aldehyde structure on reaction (E/Z) selectivity is discussed and rationalized.
Billard, F., Robiette, R., & Pospisil, J. (2012). Julia-Kocienski Reaction-Based 1,3-Diene Synthesis: Aldehyde-Dependent (E,E/E,Z)-Selectivity. The Journal of Organic Chemistry, 77(14), 6358-6364. https://doi.org/10.1021/jo300929a (Original work published 2012)