申请人:Clariant GmbH
公开号:US20030096995A1
公开(公告)日:2003-05-22
A process for preparing bisallylboranes of the formula (I) by reacting a diene with sodium borohydride in the presence of an oxidant
1
in an inert solvent, with the borane generated in situ reacting selectively with the diene to form the bis(allyl)borane of the formula (I) and the substituents R
1
to R
6
having the following meanings:
R
1
-R
6
are H, aryl or substituted or unsubstituted C
1
-C
4
-alkyl or two radicals R may be closed to form a cyclic system.
As oxidant, it is possible to use, for example, alkyl halides or dialkyl sulfates. In a particularly preferred embodiment, the diene used is 2,5-dimethylhexa-2,4-diene (R
1
, R
2
, R
5
, R
6
=methyl, R
3
, R
4
=H).
通过在惰性溶剂中将二烯与硼氢化钠在氧化剂1的存在下反应,制备公式(I)的双烯基硼烷的方法,其中原位生成的硼烷选择性地与二烯反应,形成公式(I)的双(烯基)硼烷,取代基R1至R6具有以下含义:R1-R6为H、芳基或取代或未取代的C1-C4烷基,或两个基团R可以闭合形成环状系统。作为氧化剂,可以使用例如烷基卤化物或二烷基硫酸酯。在一个特别优选的实施例中,所使用的二烯是2,5-二甲基己-2,4-二烯(R1、R2、R5、R6=methyl,R3、R4=H)。