1. W. Xie, Y. Jin, and P. G. Wang, Chemtech., 1999, 29, 23.
2. M. Kidwai, Pure Appl. Chem., 2001, 73, 147.
3. D. C. Dittmer, Chem. Ind., 1997, 779.
4. M. Kidwai, P. Sapra, K. R. Bhushan, and P. Misra, Synthesis, 2001, 10, 1509.
5. E. Keinan and Y. Mazur, J. Am. Chem. Soc., 1977, 99, 3861.