Compound, composition, organic electroluminescent element, and electronic appliance

A composition, comprising a plurality of compounds each represented by formula (20) below,

• where:
• R21 to R28 each independently represent a hydrogen atom or a substituent;
• R21 to R28 as the substituents are each independently selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, a substituted or unsubstituted phosphanyl group, a substituted or unsubstituted phosphoryl group, a substituted or unsubstituted silyl group, a substituted or unsubstituted arylcarbonyl group having 6 to 30 ring carbon atoms, a cyano group, a nitro group, a carboxy group, and a halogen atom;
• X21 to X24 are each independently CRY or a carbon atom bonded to a structure represented by formula (20a) below;
• at least one pair selected from the group consisting of a pair of X21 and X22, a pair of X22 and X23 and a pair of X23 and X24 are carbon atoms bonded to the structure represented by formula (20a);
• RY each independently represents a hydrogen atom or a substituent;
• RY as the substituent is each independently selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, a substituted or unsubstituted phosphanyl group, a substituted or unsubstituted phosphoryl group, a substituted or unsubstituted silyl group, a substituted or unsubstituted arylcarbonyl group having 6 to 30 ring carbon atoms, a cyano group, a nitro group, a carboxy group, and a halogen atom;
• where:
• *2 represent bonding positions with carbon atoms of one pair of the at least one pair;
• Y20 is selected from the group consisting of CR205R206, an oxygen atom, and a sulfur atom;
• R201 to R206 each independently represent a hydrogen atom or a substituent;
• R201 to R206 as the substituents are each independently selected from the group consisting of a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms, a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group having 6 to 30 ring carbon atoms, a substituted or unsubstituted heteroaryl group having 5 to 30 ring atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 30 ring carbon atoms, a substituted or unsubstituted arylthio group having 6 to 30 ring carbon atoms, a substituted or unsubstituted phosphanyl group, a substituted or unsubstituted phosphoryl group, a substituted or unsubstituted silyl group, a substituted or unsubstituted arylcarbonyl group having 6 to 30 ring carbon atoms, a cyano group, a nitro group, a carboxy group, and a halogen atom;
• R201 and R202 as the substituents are bonded to each other to further form a ring, or are not bonded to each other;
• R202 and R203 as the substituents are bonded to each other to further form a ring, or are not bonded to each other;
• R203 and R204 as the substituents are bonded to each other to further form a ring, or are not bonded to each other;
• and
• R205 and R206 as the substituents are bonded to each other to further form a ring, or are not bonded to each other.