Studies in diphenyl chemistry

Abstract

The nitration of haloge-no-benzenes. The formation of unsymmetrical dinitro-derivatives of symmetrical 4;4'-dihalogeno-diphenyls The nitration of 4-chloro 4--- flluoro-diphenyl- and of 4-bromo:4' -fluoro-diphenyl. Reasons for expecting that more- of the-2:38-dinitro-derivative than of the 2':3- compound would he formed. Details of the method of analysis 4-Chloro:4'-fluoro-diphenyl underwent 7-1-. 6% of 2 :38 dinitratdon and 28.4% of 2' :3-dinitration. 4-Bromot4'-fluoro-diphenyl underwent 85.8% of 2:3'- and 14.2% of 2' :3-d-initrat ion. Experimental details of the preparation of the mixed dihalogeno-diphenyls; Attempts to study the effect of 4-:4' -halogen substituents on further halogen substitution in the diphenyl molecule. Small amounts of a tribromo- and a tetrahromo-diphenyl have been isolated.