Abstract
The chemistry of aldehydes bonded to transition metals is not well-developed but has been attracting increasing attention. Most of the previously reported aldehyde complexes exhibit {eta}{sup 2}({pi})-bonding. The authors report an unprecedented hydroformylation of the C{triple bond}C bond of a metal alkynyl complex by a metal carbonyl hydride, which results in an {alpha},{beta}-unsaturated aldehyde {eta}{sup 1}({sigma})-bonded to Re{sub 2}(CO){sub 9}.
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