NEW MATERIAL:A compound expressed by formula I (A1 to A4 is trans-1,4- cyclohexylene or phenylene which may be replaced, wherein CH group in the groups may be replaced by N and CH2 group may be replaced by O or S; B1 and B2 are phenylene which may be replaced in which CH in the groups may be replaced by N; Y1 to Y4 are COO, O, OCO, CH2CH2, CH=CH, C≡C, N=N, single bond, etc.; X1 and X2 are F, Cl or Br; (m), (n), (p) or (q) are 0 or 1; R1 and R2 are 1-10C alkyl, halogen, nitrile, NCS or H).
USE: A liquid crystal compound.
PREPARATION: An iodide expressed by formula II is lithiated using n-butyl lithium to give a compound expressed by formula III and in the same manner, a compound expressed by formula IV is obtained. The compound expressed by formula III is reacted with tetrahalogenoethylene at -80°C to afford a compound expressed by formula V, which is then reacted with a compound expressed by formula IV to provide the compound expressed by formula I.
INOUE SEIICHI
ISHIHARA JUN
MACHIDA KATSUTOSHI
| JPS4725157A |