Dialkyne compounds

Die Erfindung betrifft Dialkinverbindungen der Formel I worin n, m, R , R , X , X , X , X , Z , Z , A A , Q, Y und Y die in Anspruch 1 angegebene Bedeutung aufweisen. New dialkyne compounds (I) are trans-1,4-di-substituted cyclohexane compounds and heterocyclic analogues containing 1 or 2 oxygen (O) and/or 1 or 2 silicon (Si) atoms, with lateral dialkyne substituent(s) on the ring. New dialkyne compounds (I) are trans-1,4-di-substituted cyclohexane compounds and heterocyclic analogues containing 1 or 2 oxygen (O) and/or 1 or 2 silicon (Si) atoms, with lateral dialkyne substituent(s) on the ring, of the formula (I). A = a group of formula (II): X , X , X , X = -CC-CC-R in at least one case, otherwise H; R , R = hydrogen (H), fluorine (F), 1-15C alkyl, optionally with halogen or cyano (CN) substituent(s), in which methylene (CH2) group(s) may be replaced by -O-, sulfur (-S-), carbonyl (-CO-), 1,3-cyclobutylene, carboxyl (-CO-O- or -O-CO-), carbonate (-O-CO-O-) or ethenyl (-CH=CH-) without directly linked heteroatoms; R = H, chlorine (Cl), CN, pentafluorosulfuranyl (SF5), trifluoromethyl (CF3) or 1-15C alkyl, optionally with halogen or cyano (CN) substituent(s), in which CH2 group(s) may be replaced by -CH=CH- or -O- without directly linked O atoms; Q = -CH2- or -O-; Y , Y = C or Si; A , A = trans-1,4-cyclohexylene, optionally substituted by F or CN, in which one or more non-adjacent CH2 groups may be replaced by -O- or -S-, or A ; Z , Z = -CO-O-, -O-CO-, -CH2O-, -O-, -OCH2-, -CF2O-, -OCF2-, -CF2CF2-, -CF=CF-, -CH2CH2-, -CH=CH- or a single bond; n, m = 0, 1, 2 or 3; and (m+n) = 1, 2 or 3. Independent claims are also included for (a) liquid crystal (LC) media containing not less than 2 LC components, including compound(s) (I); (b) LC displays containing the LC medium.