Wj. Xiao et al., STUDIES ON THE WITTIG REACTION .25. THE STEREOCHEMISTRY OF BIS-WITTIGREACTION BETWEEN AROMATIC-ALDEHYDES AND 1,2-BIS-YLIDES AND 1,3-BIS-YLIDES, Phosphorus, sulfur and silicon and the related elements, 116, 1996, pp. 211-216
1,2 and 1,3 bis-ylides derived from corresponding bis-phosphonium salt
s reacted with substituted benzaldehydes to give 19 dienes with E,E-se
lectivity.