| abstract |
A compound having the formula (Ph 3 C) m Ar (R 1 ) j (OR 2 ) n , wherein Ph represents a phenyl group, Ar is an aromatic ring having 6 to 20 carbon atoms R 1 and R 2 are independently C 1 -C 18 alkyl or C 4 -C 18 heteroalkyl, m is 1 or 2, and j is an integer from 1 to 4 And n is an integer from 1 to 3. [Selection figure] None |