Quinone studies—I: Evidence for a new type of substitution reaction of phenanthrene-9,10-quinone derivatives

摘要: The para orientation by the carbonyl groups in bromination of phenanthrenequinone derivatives has been explained on basis an excited state resulting from thermal excitation quinone and/or a n→π* transition nonbonding electrons oxygen atoms. A general preparative method for syntheses 3-bromophenanthrenequinone developed. structure 2-nitro-6-bromophenanthrenequinone established degradation. Synthesis 2-nitro-6-bromofluorenone is described. Direct to 2-bromo and 2,7-dibromo also