Condensation of appropriately substituted benzaldehydes or cinnamaldehydes with either bis-Wittig reagents or bis-phosphonate esters (Horner-Emmons-Wadsworth modifications) containing one or two double bond units are general and quite efficient preparations of functionalized or,o-diphenyl-polyenes containing 3, 4, 5, or 6 conjugated double bonds having all-€ configurations. Bis-Wittig reagents
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