Reactivity of Disodium and Dilithium Tetraisopropoxonickelates (II) with Some Selected II - Acidic Ligands
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Date
1988-06
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Addis Ababa Universty
Abstract
The syntheses of dilithium and disodium tetraisopropoxonickelate(
II) were achieved using a novel starting
compound, Nior2 ,2DME. This nickel(II) compound wos found
to be easy to prepare and a relatively stable compared to
the commonly used starting an,logue, NiBr2 .2thf, which
was difficult to prepare and easily hydrolized on exposure
to air. Electronic spectra and magnetic moment of
Nior2 .2DME indicate an octahedral type coordination of
nickel(II) in solution. Jhe two alkoxonickelntes
synthesized from NiDr2 .2DME were found to be identical
with those prep.'Jred using NiOr2 ,2thf. Using intramolecular
redox properties of the above isopropoxonickelates,
a series of low valent nickel complexes were
synthesized. A yellow-brownish comr1ex, Ni(prh 3)2(COD)
was synthesized starting from Na2Ni(Oirr)4.2thf. White,
tetrakis complexes of Ni(o) with friallyl phosphite,
triphenyl phosphite, and orange to yellow-brownish bis
complex of 1,2-bis(diphenYlrhosnhino)ethane were synthesized
from either alkoxonickclates. In evary case, the
complexes synthesized from lithium and sodium derivatives
were found to be the S3me. All the above complexes
were observed to be unstable in air. The results obtained
sUDnort the assumption of zero-valent nickel spocies to
be active in catalytic systems consisting of Ni(II) I PR 3 ,
and primary and primary and secondary ,lkoxides Which can
be used to transfer 1,3-dienes into Jimors and oligomers
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Keywords
Dilithium and Disodium