1: With boron tribromide in dichloromethane T=-78 - 20°C; Inert atmosphere; 2: With water; sodium hydrogencarbonate in dichloromethane Inert atmosphere;
Kolhatkar; Bapat
Journal of the University of Bombay, Science: Physical Sciences, Mathematics, Biological Sciences and Medicine, 1938 , vol. 7/3, p. 157,163, 164, 165