C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/585.9
C07C 49/167 (2006.01) C07C 45/56 (2006.01)
Patent
CA 1176660
ABSTRACT CONVERSION OF HEXAFLUOROTHIOACETONE DIMER INTO HEXAFLUOROACETONE The production of hexafluoroacetone by con- tacting, in the liquid phase, hexafluorothioacetone dimer with at least a stoichiometric amount of an aprotic solvent selected from the group consisting of dimethyl- acetamide, dimethylformamide, dimethyl sulfoxide and N-methyl pyrrolidone and at least a catalytic amount of an alkali metal fluoride or a sulfonic acid having general formula RSO3H is disclosed. Dimethylformamide and dimethyl sulfoxide are the preferred aprotic solvents; KF is the preferred alkali metal fluoride; and CH3SO3H and pCH3C6H4SO3H are the preferred sulfonic acids. The production of hexafluoroacetone by contact- ing hexafluoropropene with elemental sulfur and a cata- lytic amount of an alkali metal fluoride in an aprotic solvent at a temperature of between about 40° and about 70°C for a time sufficient to produce hexafluorothio- acetone dimer combined with increasing the temperature to between about 90° and 150°C and maintaining said temperature for a time sufficient to produce hexafluoro- acetone is also disclosed.
400279
Allied Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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