Compounds of the formula (I), wherein A
1
is formula (II); A
2
is formula (III); A
3
is formula (IV); A
4
is formula (V); w, x, y and z independently of each other are an integer from 0-4, provided that the sum of x+y+z is an integer from 2-4, corresponding to the valency of Q; M
1
, M
2
, M
3
and M
4
for example are a direct bond, CO or O; Y for example is a direct bond or S; Q is a (x+y)-valent linking group; R
1
is for example hydrogen, C
1
-C
20
alkyl or phenyl or naphthyl; R
2
and R″
2
for example are is hydrogen or C
1
-C
20
alkyl; R
3
, R
4
, R′
3
, R′
4
, R″
3
and R″
4
for example are hydrogen, halogen, phenyl, or C
1
-C
20
alkyl; and R
24
is for example a direct bond; exhibit an unexpectedly good performance in photopolymerization reactions.
公式(I)化合物,其中A1为公式(II); A2为公式(III); A3为公式(IV); A4为公式(V); w、x、y和z相互独立,均为0-4之间的整数,前提是x+y+z的总和为2-4之间的整数,对应于Q的价态; M1、M2、M3和
M4例如为直接键,CO或O; Y例如为直接键或S; Q为(x+y)-价联结基; R1例如为
氢、C1-C20烷基或
苯基或
萘基; R2和R″2例如为
氢或C1-C20烷基; R3、R4、R′3、R′4、R″3和R″4例如为
氢、卤素、
苯基或C1-C20烷基; R24例如为直接键; 在光聚合反应中表现出意外的良好性能。