Purification of tellurapyrylium dyes

Details Purification of tellurapyrylium dyes Purification of tellurapyrylium dyes

C - Chemistry, Metallurgy

09

B

260/328, 260/349

C09B 23/02 (2006.01) C07D 345/00 (2006.01) C07D 421/06 (2006.01) G03G 5/06 (2006.01) G11B 7/244 (2006.01) G11B 7/249 (2006.01)

Patent

CA 2018870

-0- PURIFICATION OF TELLURAPYRYLIUM DYFS Abstract of the Disclosure Unsymmetrical tellurapyrylium dyes can be ungraded in purity by separating them from symmetrical analogs produced as co-products. The procedure employed for the purification comprises an oxidative halogenation, followed by a fractional crystallization, and a reduction to regenerate the tellurapyrylium dye.

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