om970664q_si_001.pdf (654.15 kB)
Metallaborane Heteroatom Incorporation Reactions: Enyne Insertion into arachno-[(CO)(PMe3)2HIrB8H12]
journal contribution
posted on 1998-02-13, 00:00 authored by Jonathan Bould, Nigam P. Rath, Lawrence Barton, John D. Kennedyarachno-[(CO)(PMe3)2HIrB8H12]
(1) reacts with
HC⋮C−C(CH3)CH2 in xylene at 138
°C
to afford
[7-{C(CH3)CH2}-9,9,9-(CO)(PMe3)2-nido-9,7,8-IrC2B8H10]
(2; 10%) together with
traces of
[5,5,5-(CO)(PMe3)2-μ-6,7-{CHC(CH3)CH2}-nido-5,6-IrCB8H11]
(3, <1%). Compound
2 is a conventional nido 11-vertex
metallacarborane with the {C2Ir} three-atom string
in
the open face of the cluster, whereas compound 3 is based on
a nido 10-vertex {5,6-IrCB8}
skeleton with C(2) of the original butyne bridging adjacent B(7) and
C(6) cluster open-face
positions. Compounds 2 and 3 are
characterized by 1H, 31P, and 11B
NMR spectroscopy and
by single-crystal X-ray diffraction analysis.
