1027143-59-4Relevant articles and documents
Liquid phase synthesis of hexafluoroisobutylene
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, (2008/06/13)
The process for preparing hexafluoroisobutylene is disclosed which comprises reacting, in the liquid phase, formaldehyde or a formaldehyde-generating compound with hexafluorothioacetone dimer in an aprotic solvent containing at least a catalytic amount of an alkali metal fluoride or a sulfonic acid having general formula RSO3 H is disclosed. The preferred aprotic solvents are dimethylformamide, N-methyl pyrrolidone and dimethyl sulfoxide. The preferred alkali metal fluoride is KF; the preferred sulfonic acids are CH3 SO3 H and p-CH3 C6 H4 SO3 H. The production of hexafluoroisobutylene by contacting hexafluoropropene with elemental sulfur and a catalytic amount of an alkali metal fluoride such as KF in an aprotic solvent such as dimethyl sulfoxide or N-methyl pyrrolidone at a temperature of between about 40° and about 70° C. for a time sufficient to produce hexafluorothioacetone dimer combined with contacting said dimer in said aprotic solvent containing said alkali metal fluoride at a temperature between about 100° C. and 150° C. for a time sufficient to produce an effluent stream containing hexafluoroisobutylene which is recovered therefrom is also disclosed.
