During the sixty-four years that have elapsed since the discovery of phenanthrene only one mono-halogen derivative, other than the 9-phenanthryl halides, has been prepared. This is not due to lack of effort, for numerous attempts have been made to obtain these compounds. An extensive study of the halogenation of phenanthrene and of phenanthrene derivatives was undertaken by Sandqvist2 who succeeded in obtaining 3-chlorophenanthrene from 3 ...
