Description

3,6-Dichlorotrimellitic acid is the key precursor for preparing a variety of dichlorinated fluoresceins/rhodamines.

Ref.:

1) Improved Synthetic Procedures for 4,7,2′,7′-Tetrachloro- and 4′,5′-Dichloro-2′,7′-dimethoxy-5(and 6)-carboxyfluoresceins

M. H. Lyttle, T. G. Carter, R. M. Cook Organic Process Research & Development, 2001, 5, 45-49

DOI: 10.1021/op000292o