Method for producing high melting point crystals of...

Details Method for producing high melting point crystals of... Method for producing high melting point crystals of...

2005-05-24

2005-05-24

Rotman, Alan L. (Department: 1624)

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

C504S235000

Reexamination Certificate

active

06897312

ABSTRACT:
A method for producing β crystals of ethyl (R)-2-[4-(6-chloro-2-quinoxalin-2-yloxy)phenoxy]propionate, which is characterized by heating α crystals, or α crystals and β crystals, within a range of from 50° C. to lower than the melting point of the α crystals.

REFERENCES:
patent: 2-2145050 (1990-08-01), None
Chemical Abstracts, vol. 127, No. 8, Aug. 18, 1997, Miyake, et al., “Crystallization Behaviors of Alpha- and Beta- Quizalofop-ethyl Polymorphs in Homogeneous Nucleation,” XP002133704, Abstract No. 91664z, pp. 101-110.
Chemical Abstracts, vol. 105, No. 15, Oct. 20, 1986, Makino et al., “Crystal Structure of a New Herbicide, Ethyl 2-(4-(6-chloro-2-quinoxalinyloxy)phenox)propanate,” XP002133705, Abstract No. 143938j, pp. 237-243.
McGraw-Hill Encyclopedia of Science and Technology, vol. 14, p. 149, 1987.
Van Nostrands's Scientific Encyclopedia, Van Nostrand Reinhold, 8th Edition, p. 2057, 1995.
U. Mueller, Inorganic Structural Chemistry, John Wiley & Sons, pp. 14, 15 and 21, 1993.

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