申请人:Marshall Edward
公开号:US20110098432A1
公开(公告)日:2011-04-28
The present invention provides a complex of formula I
wherein
M is Ca, Mg, Ba or Sr;
L
1
is selected from R
1
O, R
2
S, R
3
R
4
N, R
5
R
6
P, a substituted or unsubstituted cyclopentadienide, and a substituted or unsubstituted pyrazolyl group, where R
1-6
are each independently H or hydrocarbyl;
L
2
is selected from R
7
R
8
O, R
7
R
8
S, R
7
R
8
R
9
N, R
7
R
8
C═NR
9
, PR
7
R
8
R
9
, and a substituted or unsubstituted heterocycle containing one or more O, N or S atoms, where R
7-9
are each independently H or a hydrocarbyl group; or L
1
and L
2
are linked to form a bidentate ligand;
L
3
is absent or is a solvent molecule, or a neutral ligand as defined for L
2
, wherein L
3
may be the same or different to L
2
; or L
3
is linked to a further metal centre; or L
1
, L
2
and L
3
are linked to form a tridentate ligand; and
X is an alkyl group, an aryl group, an aryloxide, an amide group, or an enolate group of formula R
10
R
11
C═CR
12
O—, wherein R
10-12
are each independently H or hydrocarbyl;
with the proviso that when L
1
and L
2
are HC(C(CH
3
)═N-2,6-
i
Pr
2
C
6
H
3
)
2
} and M is magnesium, X is other than Me or
t
Bu.