Pradhan, Suresh K.; Kadam, Subhash R.; Kolhe, Jayant N.; Radhakrishnan, Tarur V.; Sohani, Suhas V.; Thaker, Vashisth B. Journal of Organic Chemistry, 1981, vol. 46, # 13 p. 2622 - 2633 doi: 10.1021/jo00326a004