Liquid crystalline compounds containing a biphenyl core
申请人:Goodby W John
公开号:US20050001200A1
公开(公告)日:2005-01-06
A compound of formula (I) or a dimer thereof; where R
1
and R
2
are independently selected from optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, a functional group or a group of sub-formula (i) where m is 0 or 1; p is an integer of from 1 to 12; R
7
is a group of formula —C
q
X
2q+1
where q is an integer of from 1 to 12 and X is halogen such as fluoro, or
7
a group of sub-formula (ii) where k is an integer of from 1 to 10, R
8
, R
10
, and R
12
and each R
9
and R
11
are independently selected from alkyl, alkenyl or aryl, such as lower alkyl and in particular methyl; provided that at least one of R
1
or R
2
is a group of sub-formula (i); R
3
, R
4
, R
5
and R
6
are independently selected from hydrogen or halogen, and in particular fluorine, n is 0 or 1, and A is a ring structure as specified. Compounds of formula (I) may have liquid crystal properties and/or be useful in liquid crystal devices.
Hetero Diels-Alder cyclocondensation of F-alkyl aldehydes with the Danishefsky diene
作者:Laurence Lévêque、Maurice Le Blanc、Raphaël Pastor
DOI:10.1016/s0040-4039(97)01366-x
日期:1997.8
The heterocyclocondensation of F-alkylated aldehydes R-F(CH2)(n)CHO with Danishefsky's diene depends on the mutual vicinity of the carbonyl and the F-alkyl chain: when n = 4 it leads to 4-oxo pyr-2-ene 4, but when n = 0 the trimethylsilyloxypyrene 3 without methoxy elimination only results. (C) 1997 Published by Elsevier Science Ltd.
Method of alkoxylating fluorinated alcohols
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0138095B1
公开(公告)日:1988-07-27
US7351452B2
申请人:——
公开号:US7351452B2
公开(公告)日:2008-04-01
Sparingly fluorinated maltoside-based surfactants for membrane-protein stabilization
stabilize membraneproteins, but the contribution of the fluorine content in the aliphatic chain has not yet been examined in detail. We have synthesized two new maltose-based fluorosurfactants bearing either a perfluoroethyl (F2H9) or a perfluorobutyl (F4H5) tip at the end of the chain and compared them with the common detergent dodecyl maltoside and a commercial highly fluorinated octyl maltoside derivative