BY ALBERT L. HENNE AND WILLIAM C. FRANCIS Since the recent disclosure by Haszeldine'that we had obtained perfluorinated Grignard derivatives, we have received repeated requests for experimental directions. The following general procedure, while not yet optimum, will permit others to proceed with practical results. We have made our Grignard derivatives from iodides, CnF2,+ J, and most of the work was done with C3F7I. Contrary to ...