申请人:E. I. Du Pont de Nemours and Company
公开号:US05523422A1
公开(公告)日:1996-06-04
A process is disclosed for producing a 2,2-bis-substituted-trans-4,5-dichloro-4,5-difluorodioxolane of the formula ##STR1## wherein R.sub.f is selected from the group consisting of --R.sup.2.sub.f, --F, --C(O)F, --C(O)OR and R.sup.3.sub.f Q, and wherein R.sup.1.sub.f is selected from the group consisting of --F and --R.sup.2.sub.f ; wherein R.sup.2.sub.f is a perfluorinated linear or branched alkyl group having 1 to 14 carbon atoms, optionally containing ether oxygen, which is terminally substituted with --F, --Cl, --Br, --OR, --OC.sub.6 F.sub.5, --SO.sub.2 F, --N.sub.3, --CN, --COOCH.sub.3, --COOC.sub.2 H.sub.5, --SO.sub.2 Cl, --C(O)Cl or --C(O)F, wherein R is selected from the group consisting of --CH.sub.3, --C.sub.2 H.sub.5 and --CH.sub.2 CF.sub.3, wherein R.sup.3.sub.f is a single bond or a perfluoroalkylene group having from 1 to 4 carbon atoms optionally containing ether oxygen, and wherein Q is ##STR2## by isomerizing a 2,2-bis-substituted-cis-4,5-dichloro-4,5-difluorodioxolane of the same formula in the presence of a catalyst of the formula AlZ.sub.3, where Z is F, Cl, and/or Br, provided that AlZ.sub.3 is not entirely AlF.sub.3. Also disclosed is a process for producing an olefinic monomer by dechlorinating the trans-isomer products produced by said isomerization.
本发明揭示了一种生产式为##STR1##的2,2-双取代-反-4,5-二氯-4,5-二氟二噁烷的方法。其中R.sub.f从--R.sup.2.sub.f,--F,--C(O)F,--C(O)OR和R.sup.3.sub.f Q的组中选择,R.sup.1.sub.f从--F和--R.sup.2.sub.f的组中选择; R.sup.2_sub.f是一种具有1至14个碳原子的全氟线性或支链烷基,可以含有醚氧,其末端取代为--F,--Cl,--Br,--OR,--OC.sub.6F.sub.5,--SO.sub.2F,--N.sub.3,--CN,--COOCH.sub.3,--COOC.sub.2H.sub.5,--SO.sub.2Cl,--C(O)Cl或--C(O)F,其中R从--CH.sub.3,--C.sub.2H.sub.5和--CH.sub.2CF.sub.3的组中选择,R.sup.3_sub.f是单键或具有1至4个碳原子的全氟烷基,可以含有醚氧,Q为##STR2## 通过在催化剂AlZ.sub.3的存在下异构化同样式的2,2-双取代-顺-4,5-二氯-4,5-二氟二噁烷来实现。其中Z为F,Cl和/或Br,前提是AlZ.sub.3不完全是AlF.sub.3。本发明还揭示了通过脱氯反应所产生的反异构体产物来生产烯烃单体的方法。