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Hieber base reaction : ウィキペディア英語版
Metallacarboxylic acid
A metallacarboxylic acid is a metal complex with the ligand CO2H. These compounds are intermediates in reactions that involve carbon monoxide and carbon dioxide, these species are intermediates in the water gas shift reaction.
==Preparation==
Metallacarboxylic acids mainly arise by the attack of hydroxide on electrophilic metal carbonyl complexes. An illustrative synthesis is the reaction of a cationic iron carbonyl with a stoichiometric amount of base:
:()BF4 + NaOH → [(C5H5)(CO)2FeCO2H + NaBF4
When applied to simple metal carbonyls, this kind of conversion is sometimes called the Hieber base reaction. Decarboxylation of the resulting anion gives the anionic hydride complex. This conversion is illustrated by the synthesis of [HFe(CO)4] from iron pentacarbonyl.
:Fe(CO)5 + NaOH → NaFe(CO)4CO2H
:NaFe(CO)4CO2H → NaHFe(CO)4 + CO2

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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