Patent ID: 7214838
Filing Date: 2007-05-08
Classification: C07C

Abstract:
1. A method for transferring TCPX (α, α, α′, α′-tetrachloro-p-xylene) into TFPX (α, α, α′, α′-tetrafluoro-p-xylene), which comprises the following steps: (a) providing a first reactant comprising TFPX; (b) mixing said first reactant with alkali metal fluorides, TCPX and phase transfer catalyst(s) to form a mixture, wherein the alkali metal fluorides is KF, CsF, NaF, LiF or the combination thereof; the phase transfer catalyst(s) is quaternary ammonium salt, quaternary phosphonium salt or the combination thereof; and (c) heating said mixture to obtain a product.