参考文献:
Mallinckrodt Chem. Works Patent: US2576 , 1941 Full Text Show Details Wallingford Thorpe Homeyer Journal of the American Chemical Society, 1942 , vol. 64, p. 51
参考文献:
Katritzky, Alan R. Thind, Sukhpal S. Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 191 , p. 661 - 66