To synthesize the E isomer, you should use a Horner-Wittig reagent with a strong electron-withdrawing group (e.g., a carboxyl group) on the phosphorus atom. This is called a "Horner-Wadsworth-Emmons" (HWE) reagent. The reaction of the HWE reagent with the aldehyde or ketone typically results in the E-alkene.
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erythro-2-Diphenylphosphinoyl-1-phenylbutane-1,4-diol
