Purification of tellurapyrylium dyes

Details Purification of tellurapyrylium dyes Purification of tellurapyrylium dyes

1989-06-27

1990-10-16

Gerstl, Robert

Organic compounds -- part of the class 532-570 series

Organic compounds

C07D42106

Patent

active

049636693

ABSTRACT:
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.

REFERENCES:
patent: 4365017 (1982-12-01), Detty et al.
patent: 4584258 (1986-04-01), Detty
patent: 4634553 (1987-01-01), Detty et al.
Wiberg, Laboratory Technique in Organic Chemistry, p. 99 (1960).
Fishel, Modern Experimental Organic Chemistry, p. 23 (1981).
Detty et al., Tellurapyrylium Dyes, 3, Oxidative Halogen Addition Tellurium Halogen Exchange, Organometallics (1986), 5, pp. 2250-6.
Detty et al., Electron-Accepting Molecules Containing Telluropyranyl Groups. The Effect of Tellurium Oxidation State on Reduction Potentials, J. Org. Chem., 52, 2123 (1987).
Detty et al., J. Org. Chem., 1982, 47, 5235.
Detty et al., Organometallics, (1988), 7, 1131.

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