Compound, material for organic electroluminescent elements, organic electroluminescent element, and electronic device

A compound of a formula (40b),

• wherein
• k is 0,
• q is 3,
• RX is a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, or a substituted or unsubstituted 9-carbazolyl group, a plurality of RX are optionally mutually the same or different, one or no substituted or unsubstituted 9-carbazolyl group is present as RX, a plurality of substituents in a substituted or unsubstituted 9-carbazolyl group as RX are not mutually bonded to form no form a ring, RX is bonded to a carbon atom forming a benzene ring,
• D1 has formula (3a) or formula (3y),
• wherein R11 to R18 in the formula (3a) and R111 to R118 in the formula (3y) are each independently a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heterocyclic group having 5 to 30 ring atoms, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylsilyl group having 3 to 30 carbon atoms, a substituted or unsubstituted arylsilyl group having 6 to 60 ring carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, a substituted or unsubstituted alkylamino group having 2 to 30 carbon atoms, a substituted or unsubstituted arylamino group having 6 to 60 ring carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, or a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, at least one combination of substituents selected from R11 to R18 in the formula (3a) is optionally mutually bonded to form a cyclic structure, at least one combination of substituents selected from R111 to R118 in the formula (3y) is optionally mutually bonded to form a cyclic structure, A1 and A2 in the formula (3a) and B1, B2, C1, and C2 in the formula (3y) are each independently a cyclic structure of formula (31) or formula (32),
• wherein
• the cyclic structure A1, the cyclic structure A2, the cyclic structure B1, the cyclic structure B2, the cyclic structure C1, and the cyclic structure C2 are fused with an adjacent cyclic structure or cyclic structures at any position or positions,
• the cyclic structure A1 has the formula (31) and the cyclic structure A2 has the formula (32) in the formula (3a),
• the cyclic structure B1 and the cyclic structure C1 each independently have the formula (31) and the cyclic structure B2 and the cyclic structure C2 each independently have the formula (32) in the formula (3y),
• R19 and R20 in the formula (31) are each independently the same as the R11 to R18, and R19 and R20 are optionally mutually bonded to form a cyclic structure,
• X1 in the formula (32) is an sulfur atom or an oxygen atom, and
• at least one combination of R19 and R20 is optionally mutually bonded to form a cyclic structure.