... and biologically important alcohols such as dl-tocopherol, butylated hydroxyanisol (BHA), [17] β-cholesterol ... by recrystallization from CHCl 3 . 13-(Z)-Retinoic acid was exclusively synthesized by mono ... [23]. Scheme 4 Stereoselective synthesis of 13-(Z)-retinoic acid (2) and all-(E ...