The invention relates to compounds which correspond to the general formula (I) below:
in which: R
1
and R
2
represent, independently of one another, a C
4
to C
12
acyclic hydrocarbon group; R
3
represents H; a C
1
to C
12
acyclic hydrocarbon group with optionally one or more heteroatoms; a C
5
or C
6
cyclic hydrocarbon group; or a 5- or 6-membered heterocyclic group; R
4
represents H or a C
1
to C
12
acyclic hydrocarbon group with optionally one or more heteroatoms; R
5
and R
6
represent, independently of one another, H; a C
1
to C
12
acyclic hydrocarbon group with optionally one or more heteroatoms; a C
5
or C
6
cyclic hydrocarbon group; or a 5- or 6-membered heterocyclic group; on the condition however that R
5
and R
6
do not each represent H.
                            该发明涉及与下面的一般式(I)对应的化合物:其中:R1和R2分别独立地代表C4到C12的
无环烃基;R3代表H;一个具有一个或多个杂原子的C1到C12的
无环烃基;一个C5或C6的
环烃基;或一个5-或6-成员杂环基;R4代表H或一个具有一个或多个杂原子的C1到C12的
无环烃基;R5和R6分别独立地代表H;一个具有一个或多个杂原子的C1到C12的
无环烃基;一个C5或C6的
环烃基;或一个5-或6-成员杂环基;但条件是R5和R6不同时代表H。