(2-hydroxy-5-nitrophenyl)phenyl-Methanone

Preparation by nitration of o-hydroxybenzophenone,
? with 65% nitric acid in acetic acid at r.t. for 24 h (32%);
? with a 68% nitric acid/96% sulfuric acid mixture first at <10°, then at r.t. for 2 h (32%).