Use of compounds of the formula I where R denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, R 1 denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, X and Y each, independently of one another, denote an aryl or heteroaryl group having 5 to 24 ring atoms which is unsubstituted or mono- or polysubstituted by R 2, or a group of aryl and/or heteroaryl groups having 5 to 24 ring atoms which are unsubstituted or mono- or polysubstituted by R 2, where the aryl and/or heteroaryl groups in this group are each linked, independently of one another, singly or multiply, by a single bond, a double bond, conjugated double bonds, a C atom or by a unit of the formula (CHR 4) n -(Het) o -(CHR 4) p, R 2 in each case, independently of one another on each occurrence, denotes D, Hal, alkyl, OH, O-alkyl, O-aryl, S-alkyl, NH 2, NH-alkyl, N(alkyl) 2, N(aryl) 2, cycloalkyl, O-cycloalkyl, S-cycloalkyl, NH-cycloalkyl, N(cycloalkyl) 2, CN, NO 2, Si(alkyl) 3, B(OR 3) 2, C R 3, P (R 3) 2, S R 3, S 2 R 3, a straight-chain or branched alkenyl group having 2 to 20 C atoms and one or more double bonds or a straight-chain or branched alkynyl group having 2 to 20 C atoms and at least one triple bond and optionally one or more double bonds, R 3 in each case, independently of one another, denotes H, D, OH, alkyl, aryl, cycloalkyl, O-alkyl, O-aryl or O-cycloalkyl, R 4 in each case, independently of one another on each occurrence, denotes H, D, Hal, alkyl, OH, O-alkyl, O-aryl, S-alkyl, NH 2, NH-alkyl, N(alkyl) 2, N(aryl) 2, cycloalkyl, O-cycloalkyl, S-cycloalkyl, NH-cycloalkyl, N(cycloalkyl) 2, CN, NO 2 Si(alkyl) 3, B(OR 3) 2, C R 3, C 2 R 3, P (R 3) 2, S R 3, S 2 R 3, a straight-chain or branched alkenyl group having 2 to 20 C atoms and one or more double bonds or a straight-chain or branched alkynyl group having 2 to 20 C atoms and at least one triple bond and optionally one or more double bonds, alkyl denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially or fully substituted by halogen, cycloalkyl denotes a cyclic saturated or partially unsaturated cycloalkyl group having 3 to 7 C atoms, aryl denotes an aryl group having 6 to 10 C atoms, which may be mono- or polysubstituted by alkyl, O-alkyl, N(alkyl) 2 or Hal, Hal denotes F, Cl, Br or I, Het denotes O, S, -N=N-, NH or NR 2, n denotes an integer from 0 to 5, o denotes 0 or 1, p denotes an integer from 0 to 5, n+o+p denotes at least the number 1, and salts, tautomers, stereoisomers thereof, including mixtures thereof in all ratios and/or solvates, in an electronic device, where the compound is excluded. R denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, R 1 denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, X and Y each, independently of one another, denote an aryl or heteroaryl group having 5 to 24 ring atoms which is unsubstituted or mono- or polysubstituted by R 2, or a group of aryl and/or heteroaryl groups having 5 to 24 ring atoms which are unsubstituted or mono- or polysubstituted by R 2, where the aryl and/or heteroaryl groups in this group are each linked, independently of one another, singly or multiply, by a single bond, a double bond, conjugated double bonds, a C atom or by a unit of the formula (CHR 4) n -(Het) o -(CHR 4) p, R 2 in each case, independently of one another on each occurrence, denotes D, Hal, alkyl, OH, O-alkyl, O-aryl, S-alkyl, NH 2, NH-alkyl, N(alkyl) 2, N(aryl) 2, cycloalkyl, O-cycloalkyl, S-cycloalkyl, NH-cycloalkyl, N(cycloalkyl) 2, CN, NO 2, Si(alkyl) 3, B(OR 3) 2, C R 3, P (R 3) 2, S R 3, S 2 R 3, a straight-chain or branched alkenyl group having 2 to 20 C atoms and one or more double bonds or a straight-chain or branched alkynyl group having 2 to 20 C atoms and at least one triple bond and optionally one or more double bonds, R 3 in each case, independently of one another, denotes H, D, OH, alkyl, aryl, cycloalkyl, O-alkyl, O-aryl or O-cycloalkyl, R 4 in each case, independently of one another on each occurrence, denotes H, D, Hal, alkyl, OH, O-alkyl, O-aryl, S-alkyl, NH 2, NH-alkyl, N(alkyl) 2, N(aryl) 2, cycloalkyl, O-cycloalkyl, S-cycloalkyl, NH-cycloalkyl, N(cycloalkyl) 2, CN, NO 2 Si(alkyl) 3, B(OR 3) 2, C R 3, C 2 R 3, P (R 3) 2, S R 3, S 2 R 3, a straight-chain or branched alkenyl group having 2 to 20 C atoms and one or more double bonds or a straight-chain or branched alkynyl group having 2 to 20 C atoms and at least one triple bond and optionally one or more double bonds, alkyl denotes a straight-chain or branched alkyl group having 1 to 20 C atoms, which may be partially or fully substituted by halogen, cycloalkyl denotes a cyclic saturated or partially unsaturated cycloalkyl group having 3 to 7 C atoms, aryl denotes an aryl group having 6 to 10 C atoms, which may be mono- or polysubstituted by alkyl, O-alkyl, N(alkyl) 2 or Hal, Hal denotes F, Cl, Br or I, Het denotes O, S, -N=N-, NH or NR 2, n denotes an integer from 0 to 5, o denotes 0 or 1, p denotes an integer from 0 to 5, n+o+p denotes at least the number 1, and salts, tautomers, stereoisomers thereof, including mixtures thereof in all ratios and/or solvates, in an electronic device, where the compound is excluded.