B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/118, 260/645
B01J 23/08 (2006.01) B01J 21/00 (2006.01) B01J 27/00 (2006.01) B01J 31/04 (2006.01) C07C 45/68 (2006.01) C07C 51/00 (2006.01) C07D 307/32 (2006.01) C07D 335/06 (2006.01)
Patent
CA 1097606
ABSTRACT OF THE DISCLOSURE Improved supported thallium reagents are provided which signifi- cantly improve reaction rates and product selectivity of oxythallium reac- tions. The supported thallium reagents have a thallium salt of a Bronsted acid on the surface of and within, montmorillonite clay minerals, the rea- gent containing from 0.5 to 50 percent by weight thallium at least 75% of which is in the +3 oxidation state. The montmorrillonite clay preferably is an acidic montmorillonite having a surface area greater than 200m2/gram. The supported thallium reagent may be prepared by contacting the montmoril- lonite clay with the thallium salt in a mixture of methanol and trimethyl orthoformate and then removing solvent under reduced pressure until a free- flowing power is obtained. In use, an improved oxythallation of a nucleo- philic organic compound containing an olefinic, acetylenic or carbonyl group or carbon-nitrogen double bond by reaction with an electrophilic thallium (III) salt, is provided by supporting the thallium salt on the montmorillonite clay mineral, the montmorillonite supported thallium rea- gent containing from 0.5 to 50 percent by weight thallium at least 75% of which is in the +3 oxidation stats.
285563
Chiang Chih-Shu
Taylor Edward C.
White John F.
Emery Industries Inc.
Marcus & Associates
Princeton University
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