TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The electronic device is the organic electroluminescent device comprising an anode, an optional layer of a conductive polymer, at least one layer containing crosslinked groups Q or an emission layer and a cathode. The organic electroluminescent device comprises a hole transport layer or a hole-injection layer, which is optionally doped with an electron acceptor compound.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Definitions:    Ar1 = 48 heterocyclyl moieties e.g. 9H-carbazole-3,9-diyl, 9H-carbazole-2,9-diyl, dibenzofuran-2,8-diyl, dibenzofuran-3,7-diyl, dibenzothiophene-3,7-diyl, dibenzothiophene-2,8-diyl, 9,9'-spirobi(fluorene)-2,2'-diyl, 9,9'-spirobi(fluorene)-2,7-diyl, 9,9'-spirobi(fluorene)-2,2',7,7'-tetrayl, 9,9'-spirobi(fluorene)-4,4'-diyl, and 9,9'-spirobi(fluorene)-1,1'-diyl;    Ar2, Ar3, Ar6 = 1,2-phenylene, 1,3-phenylene or 1,4-phenylene (all optionally substituted by at least one group R);    Ar4-Ar7 = phenyl, o-biphenyl, m-biphenyl or p-biphenyl, o-terphenyl, m-terphenyl or p-terphenyl, quaterphenyl, fluorenyl, spirobifluorenyl or carbazolyl (all optionally substituted by at least one group R); and    Q = oxetane or its derivates or silane.    SPECIFIC COMPOUNDS - 60 Compounds (I) are disclosed e.g. N,N'-(4,4'-(9,9'-diphenyl-9H,9'H-3,3'-bicarbazole-6,6'-diyl)bis(4,1-phenylene))bis(9,9-dimethyl-N-(3'-vinylbiphenyl-4-yl)-9H-fluoren-2-amine) of formula (Ia), N,N'-(4,4'-(9,9'-diphenyl-9H,9'H-3,3'-bicarbazole-6,6'-diyl)bis(4,1-phenylene))bis(N-(4-(1,2-dihydrocyclobutabenzen-4-yl)phenyl)-9,9-dimethyl-9H-fluoren-2-amine), N,N'-(4,4'-(9,9'-diphenyl-9H,9'H-3,3'-bicarbazole-6,6'-diyl)bis(4,1-phenylene))bis(9,9-dimethyl-N-(4'-(1,2,2-trifluorovinyloxy)biphenyl-4-yl)-9H-fluoren-2-amine), N,N'-(4,4'-(6,6'-diphenyl-9H,9'H-3,3'-bicarbazole-9,9'-diyl)bis(4,1-phenylene))bis(9,9-dimethyl-N-(4'-vinylbiphenyl-4-yl)-9H-fluoren-2-amine), and N,N'-(4,4'-(5,11-diphenyl-5,11-dihydroindolo(3,2-b)carbazole-2,8-diyl)bis(4,1-phenylene))bis(N-(4-(1,2-dihydrocyclobutabenzen-4-yl)phenyl)-9,9-dimethyl-9H-fluoren-2-amine).    EXAMPLE - Methyltriphenylphosphonium bromide (0.91 g) was suspended in dry tetrahydrofuran (15 ml) under argon at 0 degrees C. Then the reaction mixture was added in portions with potassium tert-butylate (0.29 g) and stirred for 40 minutes under ice cooling. Then 4',4''-(4,4'-(9,9'-diphenyl-9H,9'H-3,3'-bicarbazole-6,6'-diyl)bis(4,1-phenylene))bis((9,9-dimethyl-9H-fluoren-2-yl)azanediyl)dibiphenyl-4-carbaldehyde (1 g) dissolved in tetrahydrofuran (50 ml) was added to the reaction mixture. Then the ice bath was removed after 30 minutes and the reaction mixture was stirred for 6 days at room temperature. Then the reaction mixture was worked up to obtain (Ia).