Title: 4¢,5¢-Dichlorofluorescein
CAS Registry Number: 2320-96-9
CAS Name: 4¢,5¢-Dichloro-3¢,6¢-dihydroxyspiro[isobenzofuran-1(3H),9¢-[9H]xanthen]-3-one
Additional Names: D & C Orange no. 8; 4,5-dichloro-3,6-fluorandiol
Molecular Formula: C20H10Cl2O5
Molecular Weight: 401.20
Percent Composition: C 59.87%, H 2.51%, Cl 17.67%, O 19.94%
Literature References: Prepd by condensation of 2-chlororesorcinol with phthalic anhydride: Colour Index vol. 4 (3rd ed., 1971) p 4424.
Properties: Orange powder, insol in water and in dil acids. Sol in alcohol and in dil alkali yielding solns which are orange with a greenish-yellow fluorescence. Slightly sol in glycerol and the glycols. Practically insol in oils, fats and waxes. If a soln of the dye in strong alkali is heated, a violet color is produced.
Derivative Type: Disodium salt
Additional Names: C.I. Solvent Orange 32; C.I. 45365
Molecular Formula: C20H8Cl2Na2O5
Molecular Weight: 445.16
Percent Composition: C 53.96%, H 1.81%, Cl 15.93%, Na 10.33%, O 17.97%
NOTE: Structure depicted as the open tautomer.

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