Diamantane compound, organic electroluminescent device material and organic electroluminescent device

A diamantane compound represented by formula (5) below or formula (6) below,

• (in a diamantane ring in formula (5), carbon atoms other than a carbon atom bonded to an -L1-X1 group are optionally substituted with an aryl group having 6 to 12 carbon atoms,
• each L1 in formula (5) independently represents
• (i) an optionally substituted aromatic hydrocarbon group having 6 to 60 carbon atoms,
• (ii) an optionally substituted heteroaromatic group having 3 to 60 carbon atoms or
• (iii) a group that is a combination of the groups of (i) and (ii),
• a total number of carbon atoms constituting L1 is 8 or more,
• X1 in formula (5) represents a halogen atom or a trifluoromethanesulfonyloxy group, and
• in formula (5), p and q each represent an integer of 1 to 3, when p is 1, q represents an integer of 1, 2 or 3, and when q is 1, p represents an integer of 1, 2 or 3),
• (in a diamantane ring in formula (6), carbon atoms other than a carbon atom bonded to an -L2-B(OR1)2 group are optionally substituted with an aryl group having 6 to 12 carbon atoms,
• each L2 in formula (6) independently represents a single bond or
• (i) an optionally substituted aromatic hydrocarbon group having 6 to 60 carbon atoms,
• (ii) an optionally substituted heteroaromatic group having 3 to 60 carbon atoms or
• (iii) a group that is a combination of the groups of (i) and (ii),
• R1 in formula (6) represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a phenyl group, two R1's of B(OR1)2 may be the same or different, the two R1's may be combined to form a ring including an oxygen atom and a boron atom, and
• in formula (6), p and q each represent an integer of 1 to 3, when p is 1, q represents an integer of 1, 2 or 3, and when q is 1, p represents an integer of 1, 2 or 3).