NOVELTY - Bispyrimidine compounds (A) are new.    USE - (A) are useful in an electronic device, which is an electroluminescent device. (A) are useful in an electron transport layer, which is useful in an apparatus comprising stationary visual display units such as visual display units of computers, televisions, visual display units in printers, kitchen appliances and advertising panels, illuminations, information panels, and mobile visual display units such as visual display units in cellphones, laptops, digital cameras, MP3 players, vehicles and destination displays on buses and trains, illumination units, keyboards, items of clothing, furniture and wallpaper. (A) are useful in electrophotographic photoreceptors, photoelectric converters, organic solar cells (organic photovoltaics), switching elements, organic light emitting field effect transistors, image sensors and dye lasers (all claimed).    ADVANTAGE - (A) provide improved efficiency, stability, manufacturability, or spectral characteristics of electroluminescent devices.    DETAILED DESCRIPTION - Bispyrimidine compounds (A) of formulae (I) and (II) are new.    Ar1, Ar2, Ar1a, Ar2a = 6-24C aryl group or 2-30C heteroaryl group (both optionally substituted by 6-10C aryl or 2-5C heteroaryl (both optionally substituted by 1-8C alkyl), G or 4-18C cycloalkyl);    R1, R2 = 1-25C alkoxy (substituted by E or interrupted by D), 6-24C aryl (substituted by G), 2-30C heteroaryl group (substituted by G), F, CN, NR45R45a, 1-25C alkyl or 4-18C cycloalkyl;    m, n = 0-4;    D = -CO-, -COO-, -S-, -SO-, -O-, -NR65-, -SiR70R71-, -POR72-, -CR63=CR64- or -CC-;    E = -OR69, -SR69, -NR65R66, -COR68, -COOR67, -CONR65R66, -CN or halo;    G = E or 1-25C alkyl;    R45, R45a = 1-25C alkyl, 4-18C cycloalkyl in which one or more C atom which are not in neighborhood to each other could be replaced by -NR45aa-, -O-, -S-, -C(=O)-O- or -O-C(=O)-O-, one or more H atom can be replaced by F, 6-24C aryl, or 6-24C aryloxy, one or more C atom can be replaced by O, S, or N, and/or which can be substituted by one or more non-aromatic groups R1;    R45aa = 1-25C alkyl or 4-18C cycloalkyl;    R63, R64, R68 = 6-18C aryl (optionally substituted by 1-18C alkyl or 1-18C alkoxy) or 1-18C alkyl (optionally interrupted by -O-) or H; either    R65-R67, R69 = 6-18C aryl (optionally substituted by 1-18C alkyl or 1-18C alkoxy) or 1-18C alkyl (optionally interrupted by -O-); or    R65R66 = 5-6 membered ring; and    R70-R72 = 1-18C alkyl, or 6-18C aryl (optionally substituted by 1-18C alkyl).    An INDEPENDENT CLAIM is included for the preparation of (I).