Organic electroluminescence device and anthracene derivative

An anthracene derivative of formula (2):

• wherein
• Ar is a substituted or unsubstituted condensed aromatic group having 10 to 50 nuclear carbon atoms;
• Ar′ is a substituted or unsubstituted aromatic group having 6 to 50 nuclear carbon atoms;
• X is a substituted or unsubstituted aromatic group having 6 to 50 nuclear carbon atoms, a substituted or unsubstituted aromatic heterocyclic group having 5 to 50 nuclear atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted alkoxyl group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 50 carbon atoms, a substituted or unsubstituted aryloxyl group having 5 to 50 nuclear atoms, a substituted or unsubstituted arylthio group having 5 to 50 nuclear atoms, a substituted or unsubstituted alkoxycarbonyl group having 1 to 50 carbon atoms, carboxyl group, a halogen atom, cyano group, nitro group or hydroxyl group;
• a and b are each an integer of 0 to 4;
• and
• n is an integer of 1 to 3 and, when n represents 2 or 3, two or three groups represented by:
• may be the same or different.