1: With titanium(IV) isopropylate in isopropyl alcohol T=20°C; Inert atmosphere; 2: With hydrogenchloride in water; isopropyl alcohol 0.5 h; Cooling with ice bath;
Seyferth, Dietmar; Weinstein, Robert M.; Hui, Richard C.; Wang, Wei-Liang; Archer, Colin M.
Journal of Organic Chemistry, 1992 , vol. 57, # 21 p. 5620 - 5629