| 摘要 |
A compound having the formula (I) where each of R1, R2, R3 and R4 is inde pendently C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C 1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl s .upsilon.bstituent, C4-C20 branched alkyl-, C16-C20 linear alkyl-, RO-, -NRR ', -PRR', -SR, fluoro substituted forms thereof, and perfluoro forms thereof : and R5 is C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1-C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl substituent, C3-C20 branched alkyl-, C2-C30 linear alkyl-, fluoro substitut ed forms thereof, and perfluoro forms thereof; where R and R' are each indep endently C6-C18 aryl-, C5-C8 cycloalkyl-, C6-C18 aryl having at least one C1 -C20 alkyl substituent, C5-C8 cycloalkyl having at least one C1-C20 alkyl su bstituent, C4-C20branched alkyl-, C2-C30 linear alkyl-, fluoro substituted f orms thereof, and perfluoro forms thereof; A is N, P, S, or O with the provi so that when A is S, R2 is a nullitv; and M is B, Al, Ga or In.
|
