| 主权项 |
1. A compound of Formula I: wherein X is selected from the group consisting of O, S, and Se; wherein R2 represents mono, di, or tri substitution, or no substitution; wherein R1 and R2 are each independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; wherein any adjacent R2 are optionally joined or fused into a ring; and provided that when R1 comprises heteroaryl, it does not contain nitrogen. |
