Alternative Synthesis of 1,8-Difluoroanthracene via the Balz-Schiemann Reaction

Table 1

Different fluoroanthraquinones prepared by the isopropanol precipitation method.

Compound	Overall yield after decomposition (%)	Lit. yield (%) [10]	Purity by GC-MS
1-Fluoro-9,10-anthraquinone	82 (sublimed)	65	98%
2-Fluoro-9,10-anthraquinone	81 (sublimed)	69	98%
2,6-Difluoro-9,10-anthraquinone	49 (sublimed)	38	95%

The overall yield was calculated based on the amine-anthraquinone starting material yielding the fluoroderivative.