thionyl chloride in chloroform E. Wilson and M. Tishler, J. Am. Chem. Soc., 73, 3635 (1951);

1: 80 percent / ethanol / Heating; E. Wilson and M. Tishler, J. Am. Chem. Soc., 73, 3635 (1951) 2: thionyl chloride / CHCl3 / E. Wilson and M. Tishler, J. Am. Chem. Soc., 73, 3635 (1951) View Scheme