A compound of formula I P 1 -Sp 1 -(A 1 -Z 1) n -A 2 -O-Sp 4 -CH(Sp 2 -P 2)(Sp 3 -P 3) I in which the individual radicals have the following meanings: P 1, P 2, P 3 independently of each other denote a vinyloxy, acrylate, methacrylate, fluoroacrylate, chloroacrylate, oxetane or epoxide group, Sp 1 is a single bond, or Sp 1 is -(CH 2) p1 - or -(CH 2) p1 -O-, in which p1 is 1, 2 or 3, Sp 2 and Sp 3 denote -(CH 2) p2 -, in which p2 is 1, 2 or 3, and Sp 4 is -(CH 2) p4 -, in which p4 is 1, 2 or 3, A 1, A 2 independently of each other, and on each occurrence identically or differently, denote an aromatic, heteroaromatic, alicyclic or heterocyclic group having 4 to 25 C atoms, which may also contain fused rings, and which is optionally mono- or polysubstituted by L, Z 1 denotes, on each occurrence identically or differently, -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -OCH 2 -, -CH 2 O-, -SCH 2 -, -CH 2 S-, -CF 2 O-, -OCF 2 -, -CF 2 S-, -SCF 2 -, -(CH 2) n -, -CF 2 CH 2 -, -CH 2 CF 2 -, -(CF 2) n -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH 2 -CH 2 -CO-O-, -O-CO-CH 2 -CH 2 -, -CR 00 R 000 -, or a single bond, L denotes P 1 -, P 1 -Sp 1 -, F, Cl, Br, I, -CN, -NO 2, -NCO, -NCS,-OCN, -SCN, -C(=O)N(R x) 2, -C(=O)Y 1, -C(=O)R x, -N(R x) 2, optionally substituted silyl, optionally substituted aryl or heteroaryl having 5 to 20 ring atoms, or straight-chain or branched alkyl having 1 to 25, particularly preferably 1 to 10,, C atoms, in which, in addition, one or more non-adjacent CH 2 groups may each be replaced, independently of one another, by -C(R 00)=C(R 000)-, -C≡C-, -N(R 00)-, -O-, -S-, -CO-, -CO-O--O-CO-, -O-CO-O- in such a way that O and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, CN, P 1 - or P 1 -Sp 1 -, R 00 and R 000 each, independently of one another, denote H or alkyl having 1 to 12 C atoms, Y 1 is halogen, R x denotes P 1 -, P 1 -Sp 1 -, H, halogen, straight chain, branched or cyclic alkyl having 1 to 25 C atoms, wherein one or more non-adjacent CH 2 -groups are optionally replaced by -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O- in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are optionally replaced by F, Cl, P 1 - or P 1 -Sp 1 -, optionally substituted aryl, aryloxy, heteroaryl or heteroaryloxy having 5 to 20 ring atoms, n is 1, 2, 3 or 4. P 1, P 2, P 3 independently of each other denote a vinyloxy, acrylate, methacrylate, fluoroacrylate, chloroacrylate, oxetane or epoxide group, Sp 1 is a single bond, or Sp 1 is -(CH 2) p1 - or -(CH 2) p1 -O-, in which p1 is 1, 2 or 3, Sp 2 and Sp 3 denote -(CH 2) p2 -, in which p2 is 1, 2 or 3, and Sp 4 is -(CH 2) p4 -, in which p4 is 1, 2 or 3, A 1, A 2 independently of each other, and on each occurrence identically or differently, denote an aromatic, heteroaromatic, alicyclic or heterocyclic group having 4 to 25 C atoms, which may also contain fused rings, and which is optionally mono- or polysubstituted by L, Z 1 denotes, on each occurrence identically or differently, -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -OCH 2 -, -CH 2 O-, -SCH 2 -, -CH 2 S-, -CF 2 O-, -OCF 2 -, -CF 2 S-, -SCF 2 -, -(CH 2) n -, -CF 2 CH 2 -, -CH 2 CF 2 -, -(CF 2) n -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH 2 -CH 2 -CO-O-, -O-CO-CH 2 -CH 2 -, -CR 00 R 000 -, or a single bond, L denotes P 1 -, P 1 -Sp 1 -, F, Cl, Br, I, -CN, -NO 2, -NCO, -NCS,-OCN, -SCN, -C(=O)N(R x) 2, -C(=O)Y 1, -C(=O)R x, -N(R x) 2, optionally substituted silyl, optionally substituted aryl or heteroaryl having 5 to 20 ring atoms, or straight-chain or branched alkyl having 1 to 25, particularly preferably 1 to 10,, C atoms, in which, in addition, one or more non-adjacent CH 2 groups may each be replaced, independently of one another, by -C(R 00)=C(R 000)-, -C≡C-, -N(R 00)-, -O-, -S-, -CO-, -CO-O--O-CO-, -O-CO-O- in such a way that O and/or S atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by F, Cl, CN, P 1 - or P 1 -Sp 1 -, R 00 and R 000 each, independently of one another, denote H or alkyl having 1 to 12 C atoms, Y 1 is halogen, R x denotes P 1 -, P 1 -Sp 1 -, H, halogen, straight chain, branched or cyclic alkyl having 1 to 25 C atoms, wherein one or more non-adjacent CH 2 -groups are optionally replaced by -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O- in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are optionally replaced by F, Cl, P 1 - or P 1 -Sp 1 -, optionally substituted aryl, aryloxy, heteroaryl or heteroaryloxy having 5 to 20 ring atoms, n is 1, 2, 3 or 4.