toluene-4-sulfonic acid in pyridine; 1,2-dichloro-ethane T=75 - 80°C; 3 h;
参考文献
Lukevits, E.; Trushule, M.; Zarinya, D.; Ignatovich, L. M.; Liepin'sh, E.
J. Gen. Chem. USSR (Engl. Transl.), 1981 , vol. 51, # 4 p. 827 - 834,685 - 690
Hoffman, Robert V.; Salvador, James M.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1989 , p. 1375 - 1380