Reductive cleavage ofbenzylidene acetals using a modified low-valent titanium species results in thestereoselective formation of (E)-stilbenes [cf. (III), (VI)] and arylalkanes (II).Aliphatic acetals such as (Vb) remain unaffected under similar conditions.Hence, this reaction offers an indirect protocol for the stereoselective synthesisof stilbenes in a modified McMurry pathway.
S. Talukdar, Nayak, S. K., and Banerji, A., “Low-Valent Titanium Mediated Reductive Cleavage of Benzylidene Acetals: A Modified Mcmurry Reaction”, Synthetic communications, vol. 28, pp. 2325–2335, 1998.