Patent ID: 6313331
Filing Date: 2001-11-06
Classification: C07F,C08F

Abstract:
A complex of the formula II: ##STR11##wherein M is a metal atom selected from the group consisting of a transition metal, a post transition metal and a lanthanide; R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently selected from the group consisting of a hydrogen atom, a saturated or unsaturated straight chained, branched or cyclic hydrocarbyl radical which is unsubstituted or substituted by one or more substituents selected from the group consisting of a halogen atom and a C.sub.1-6 alkyl radical; R.sup.7 and R.sup.8 are independently selected from the group consisting of a halogen atom, an alkyl, an amide --NR.sup.1 R.sup.2, an alkoxide or aryl oxide group --OR.sup.1, and an --OSi(R.sup.1).sub.3 group wherein R.sup.1 and R.sup.2 are defined above, a saturated or unsaturated straight chained, branched or cyclic hydrocarbyl radical which are unsubstituted or substituted by a halogen atom or a C.sub.1-6 alkyl radical, and a Lewis base which may contain a donor heteroatom, and each R.sup.5 is independently selected from the group consisting of radicals selected from the group consisting of saturated and unsaturated straight chained, branched and cyclic hydrocarbyl radicals, C.sub.6-12 cyclic aliphatic or aromatic radical; radicals of the formula Si(R.sup.6).sub.3 wherein each R.sup.6 is independently selected from the group consisting of saturated or unsaturated straight chained, branched or cyclic hydrocarbyl radicals, and radicals of the formula III: ##STR12##wherein R.sup.9, R.sup.10, R.sup.11 and R.sup.12 are independently selected from the group consisting of a hydrogen atom, a fluorine atom, a NO.sub.2 radical, a C.sub.1-6 alkyl radical, and a C.sub.8-12 aryl radical and E is an endocyclic nitrogen atom or a C--CN group and R.sup.14 is selected from the group consisting of a hydrogen atom and a C.sub.1-20 hydrocarbyl radical which may contain a terminal functional group; and optionally R.sup.14 taken together with the transitional metal may form a constrained ring.