... (e) Brittain, J. M.; de la Mare, P. B. D. In The Chemistry of Functional Groups; Patai, S., Rappoport, Z., Eds.; Wiley: New York, 1983; Supplement D, Chapter 12. ... They were able to isolate chloro analogues of 5 from various organic media4 but ... Page 2. 2586 J. Org. Chem., Vol. ...