Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2005-02-15
2005-02-15
Richter, Johann (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S328000, C570S143000, C546S112000, C546S346000, C544S336000, C544S409000
Reexamination Certificate
active
06855850
ABSTRACT:
To provide a practical method of manufacturing fluorine compounds in a small number of steps that can carry out fluorination reaction of substrates using easily available fluorinating agents that can be inexpensively produced industrially, and recover precursors of the fluorinating agents generated accompanying the reaction quantitatively in an easy operation, and a method of recovery and regeneration of the precursors of the fluorinating agents.N-Fluoro-quaternary-nitrogen-onium tetrafluoroborate salts represented by the general formula (1) as the fluorinating agents are used.N-Hydro-quaternary-nitrogen-onium tetrafluoroborate salts represented by the general formula (2) generated accompanying the reaction are separated and recovered from the reaction mixture by means of depositing as crystals by the addition of solvents with a low affinity to the salts to the reaction mixture after the reaction.
REFERENCES:
patent: 5606084 (1997-02-01), Poss et al.
patent: 5631372 (1997-05-01), Poss et al.
Umemoto et al. Synthesis, Properties, and Reactivity of N,N-Difluorobipyridinium and Related Salts and Their Applications as Reactive and Easy to Handle Electrophilic Fluorinating Agents . . . □□Journal of Organic Chemistry, 1998, vol. 63, p 3379-3385.*
Manandhar et al., Electrophilic Fluorinating Reagent Mediated Synthesis of Fluorinated alpha-Keto Ethers, Benzil, and 6,6-Dialkoxy-2,2-bipyridines.□□Journal of Organic Chemistry, 2002, vol. 67 p 6415-6420.
Adachi Kenji
Oishi Satoshi
Tomizawa Ginjiro
Daikin Industries Ltd.
Richter Johann
Witherspoon Sikarl A.
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