The invention relates to dimer and multimer form of BAPO compounds of the formula (I) dimer and multimer forms of MAPO compounds of the formula (II) wherein R
1
, R
2
, and R
3
independently of one another are unsubstituted or substituted C
1
-C
12
alkyl, benzyl, C
1
-C
12
alkoxy, C
3
-C
6
cycloalkyl or C
5
-C
14
aryl; Q is a di-tri or tetravalent arylene residue; n is 1-4, m is 0-2, n+m is 2, 3 or 4, with the proviso, that R
1
and R
3
are different from each other. The invention further relates to a process for the preparation of dimer or multimer forms of BAPO compounds of the formula (I) and of dimer or multimer forms of MAPO compounds of the formula (II), characterized in the (n+m) equivalents of a dimetalated-phosphine R
1
P(M)
2
is reacted with one equivalent of a di- or polycarboxylic acid halogenide to form an intermediate of the formula III the intermediate is then reacted either with (n+m) equivalents of a further carboxylic acid halogenide (R
2
—CO-Hal) or with a halogenide R
3
-Hal, the reaction products are then oxidized to form phosphine oxides of the formula I or II.
本发明涉及式(I)的二聚体和多聚体形式的
BAPO 化合物 式(II)的二聚体和多聚体形式的
MAPO 化合物 其中 R
1
, R
2
和 R
3
各自独立地为未取代或取代的 C
1
-C
12
烷基、苄基、C
1
-C
12
烷氧基、C
3
-C
6
环烷基或 C
5
-C
14
芳基;Q 是二-三价或四价芳基残基;n 是 1-4,m 是 0-2,n+m 是 2、3 或 4,但 R
1
和 R
3
互不相同。本发明还涉及一种制备式(I)的二聚体或多聚体形式的
BAPO 化合物和式(II)的二聚体或多聚体形式的
MAPO 化合物的工艺,其特征在于(n+m)当量的二甲基化膦 R
1
P(M)
2
与一当量的二
羧酸或多
羧酸卤化物反应,形成式 III 的中间体,该中间体再与(n+m)当量的另一种
羧酸卤化物(R
2
-CO-Hal)或卤化物 R
3
-Hal反应,然后将反应产物氧化,形成式 I 或式 II 的膦氧化物。