A compound represented by the following formula:
wherein
R is a C3-C24 olefinically unsaturated organic radical having functionality which renders the nitrogen atom electron deficient, the olefinic unsaturation functionality being polymerizable,
R1 is hydrogen or a C1-C4 alkyl radical, or
R and R1 together with the nitrogen atom can form an olefinically unsaturated 5 to 7-member ring which has functionality that renders the nitrogen atom electron deficient and the olefinic unsaturation functionality is polymerizable,
R2 and R3 are hydrogen, a C1-C4 alkyl or acyl radical, or
R2 and R3 together are a C2-C4 alkylene group,
R4 is hydrogen or a C1-C4 alkyl, acyl, ester, amide or acid group, and
n is an integer from 1 to 10, provided n is not 1 when R is (meth)acryloyl, R2 and R3 are methyl and R1 and R4 are hydrogen.
Under acidic conditions the above compounds having R1 = hydrogen afford cyclic hemiamidals and hemiamide ketals of the following formula
下式所代表的化合物:
其中
R 是 C3-C24 烯烃不饱和有机基,具有使氮原子缺电子的官能团,烯烃不饱和官能团可聚合、
R1 是氢或 C1-C4 烷基,或
R 和 R1 与氮原子一起可形成烯烃不饱和的 5 至 7 元环,该环具有使氮原子缺电子的官能度,且烯烃不饱和官能度可聚合、
R2 和 R3 是氢、C1-C4 烷基或酰基,或
R2 和 R3 合在一起是一个 C2-C4 烯基、
R4 是氢或 C1-C4 烷基、酰基、酯基、酰胺基或酸基,以及
n 是 1-10 之间的整数,条件是当 R 是(甲基)
丙烯酰基、R2 和 R3 是甲基、R1 和 R4 是氢时,n 不是 1。
在酸性条件下,R1=氢的上述化合物可生成下式的环半酰胺和半酰胺酮