A compound having formula (Ph3C)mAr(GR)n, wherein Ph represents a phenyl group, Ar is an aromatic ring system having from six to twenty carbon atoms; G is O, S, SO or SO2; R is: (a) C1-C18 alkyl substituted by at least one of OH, SH, C1-C18 alkoxy and cyano; or (b) C4-C18 heteroalkyl; m is one or two; and n is an integer from one to four.
化合物的
化学式为(Ph3C)mAr(GR)n,其中Ph代表苯基,Ar是具有6至20个碳原子的芳香环系统;G为O、S、SO或SO2;R为:(a)至少被OH、SH、C1-C18烷氧基和
氰基中的一种取代的C1-C18烷基;或(b)C4-C18杂烷基;m为1或2;n为1至4的整数。