Scheme 1.
General Wittig procedure for the preparation of cis- and trans-stilbenes. (a) CCl4, PPh3, dry CH2Cl2, N2, r.t.; (b) PPh3, toluene, at reflux; (c) n-BuLi (1.6 M in hexane), dry THF, N2, −20 °C to r.t.
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