In contrast to trans-[IrCl(C2H4)(SbiPr(3))(2)] (2), which has been obtained
from [IrCl(C2H4)(2)-(SbiPr(3))(2)] ii! by abstraction-of ethene together w
ith some byproducts, the corresponding cycloocteneiridium(I) complex trans-
[IrCl(C8H14)SbiPr(3))(2)] (4) can be prepared from [IrCl-(C8H14)(2)](2) (3)
and 4 equiv of SbiPr(3) in excellent yield. Compound 4 rearranges in hexan
e at room temperature to anti,exo-[IrHCl(eta (3)-C8H13)(SbiPr(3))(2)] (5a),
which in benzene is in equilibrium with the anti,cndo isomer 5b. Compound
5a is generated from 4 even in the solid state. Treatment of 4 with propene
and l-hexene results in the displacement, of cyclooctene and affords exo-[
IrHCl(eta (3)-C3H5)(SbiPr(3))(2)] (6a) and anti, exo- [IrHCl(eta (3)-C6H11)
-(SbiPr(3)2)] (7), (7), respectively. Similarly to 5a, also 6a isomerizes t
o endo-[IrHCl(eta (3)-C3H5)- (SbiPrO(3))(2)] (6b). The reaction of 6a with
HCl leads to the formation of [IrHCl2(SbiPr(3))(2)]) (8), which forms the 1
:1 adduct 9 with C2H3 The preparation of other bis(triisopropylstibine)-iri
dium complexes 10-12 has been achieved by using 4 as the starting material.
Compounds Sa and 6a have been characterized crystallographically.