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Crimminsaldol. In case of acetate aldol reaction with crimmins auxilairy eq of TiCl eq Of base give acetate syn product and eq of TiCl eq Of base give acetate anti product Mathis Hodge and Horacio Olivo Tetrahedron but in case of propiolate aldol reaction using thiozolidenthione or oxazolidenethion eq of TiCl eq Of base