Perfluoroparacyclophane and methods of synthesis and use thereof
申请人:Dolbier William R.
公开号:US20080207961A1
公开(公告)日:2008-08-28
A composition comprising perfluoro-[2,2]-paracyclophane dimer compound is disclosed. The synthesis reaction of the paracyclophane dimer from 1,4-bis(chlorodifluoromethane)-2,3,5,6-tetrafluorobenzene involves heating in the presence of a metal catalyst and a solvent. A perfluorinated paraxylylene coating formed from the perfluorinated paracyclophane dimer is also disclosed.
Processes are disclosed for the preparation of octafluoro-[2,2]paracyclophane which utilize a low temperature, e.g., less than about 200.degree. C., and a reducing agent comprising titanium to promote the dimerization of dihalo-tetrafluoro-p-xylenes. One suitable reducing agent is prepared by combining TiCl.sub.4 with LiAlH.sub.4 in an organic solvent.
A convenient preparation of octafluoro[2,2]paracyclophane and dodecafluoro[2,2]paracyclophane
作者:Shi-zheng Zhu、Yun-yu Mao、Gui-fang Jin、Chao-yue Qin、Qian-li Chu、Chang-ming Hu
DOI:10.1016/s0040-4039(01)02231-6
日期:2002.1
A new and convenientsynthesis of octafluoro[2,2]paracyclophane and dodeca-fluoro[2,2]paracyclophane is reported. It is accomplished by treatment of 1,4-bis(halodifluoromethyl)benzene with PbBr2/Al in DMF at room temperature via the cyclocoupling of the reactive intermediate α,α,α′α′-tetrafluoro-p-xylylene.
FACILE AND EFFECTIVE METHOD OF PREPARING 1,4-BIS(CHLORODIFLUOROMETHYL)BENZENE
申请人:LIN Chun-Hsu
公开号:US20130116482A1
公开(公告)日:2013-05-09
The present invention relates to a facile method of preparing 1,4-bis(chlorodifluoromethyl)benzene, comprising the steps of: (A) providing a reactant liquid of 1,4-bis(difluoromethyl)benzene; optionally (B) providing a light source for UV radiation; and (C) introducing chlorine gas into the reactant liquid at a temperature of 50-90° C. under a pressure above 1 atm to obtain 1,4-Bis(chlorodifluoromethyl)benzene. The invented facile method can be utilized in a batch process or a continuous process for effective production of 1,4-bis(chlorodifluoromethyl)benzene.
Novel fluoropolymers formed by an unprecedented SRN1 condensation polymerization mechanism
作者:William R. Dolbier、Valerie Rodriguez-Garcia、Kai Wu、Alexander Angerhofer、Lotfi Hedhli、Maher Elsheikh
DOI:10.1016/j.jfluchem.2008.02.010
日期:2008.10
A condensation copolymerization reaction between bis-phenol A and p-bis-(chlorodifluoro-methyl)benzene has been carried out to form a novel fluoropolymer that has excellent thermal and solubility properties. It is proposed that this polymerization reaction occurs via an unprecedented SRN1 mechanism. This demonstration of the use of SRN1 chemistry for condensation polymerizations of fluorinated monomers