| 摘要 |
Macrocyclic tetramers, useful as components for opto-electronic displays or the like, have the formula:- <CHEM> wherein R is a C1-C3 alkyl group; and, the groups R<1> are the same or different and each is a group of the formula: - @ - CnH2n+1 (II) (in which n is an integer of 10 or more), <CHEM> (in which m is an integer of 11 or more), or <CHEM> (in which p is an integer of 11 or more). r |
