1. Shah and LaiwalaJ. Chem. Soc., 1938, 1828. Shah, H. A. and Shah, R. C.Ibid. J. Chem. Soc., 1939, 132, 300, 949; 1940, 245. Chandrashekhar and ShahProc. Ind. Acad. Sci., 1949,29 A, 227.
2. FujikawaBer., 1935,68 B, 72.
3. Gattermann and KobnerIbid., 1899,32, 279.
4. Pechmann and WelshIbid., 1884,17, 1469. Bistrzycki and KostaneckiBer., 1885,18, 1986. SchwarzIbid. Ber., 1880,13, 1643. Robertson and RobinsonJ. Chem. Soc., 1927, 2199.
5. RaisinkiJ. prakt. Chem., 1882, (2)26, 59.