| abstract |
NEW MATERIAL: A compd. represented by formula [wherein R 1 and R 2 are each a 1-15C alkyl which may be substituted by CN, F or Cl, a 3-15C alkenyl (wherein one CH 2 in a chain can be replaced by -O-, -CO or -O-CO-), m is 0-2, A 1 to A 3 are each 1,4-cyclohexenylene, trains 1,4-cyclohexylene or 4-phenylene (wherein CH 2 can be replaced by -O-) and Z 1 and Z 2 are each -CO-O-, -CH 2 O- or -CH 2 CH 2 -]. n EXAMPLE: 4-Pentyl-1-(2,3-difluorophenyl)-1-cyclohexene. n USE: A liquid crystal compd. n PREPARATION: 1,2-Difluorobenzene is metalated to be reacted with a corresponding electrophilic reagent to obtain 1-substituted 2,3-difluorobenzene and reaction is succeedingly performed to obtain the compd. represented by the formula. n COPYRIGHT: (C)1990,JPO |