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The enantioselective addition of diorgano-H-phosphonates to aldehydes, the phospho-aldol reaction, is catalysed by both (R,R)-salcyen and (R,R)-salcyan complexes of aluminium at room temperature under aerobic conditions. However, whilst the former ligand system favours one absolute configuration of product α-hydroxyphosphonate ester, to the extent of <50%, the latter ligand framework favours the...
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