2-Fluoropyridines, processes for their preparation and their use in ferroelectric liquid crystal mixtures A 2-fluoropyridine of the formula (I) STR1 in which the symbols have the following meaning: R1, R2, independently of one another, are, for example, H or straight-chain or branched alkyl, A1, A2, A3, A4, identical or different, are, for example, 1-phenylene, pyrazine-2,5-diyl or trans-1,4-cyclohexylene, M1, M2, M3, M4, identical or different, are, for example, --O-- or --CO--O--, R3, R4, R6, R7, independently of one another, are, for example, H or straight-chain or branched alkyl, M5 is, for example, --O--CO-- or a single bond, k, l, m, n, o, p, q, r are zero or one, with the proviso that the sum of k+m+p+r is less than 4 and greater than zero, can advantageously be used as a component in ferroelectric liquid crystal mixtures.