Abstract
Abstract Me2P(:O)H and Me3P(:S)H reacted with several aldehydes with formation of the corresponding tertiary phosphine oxides and sulfides 1-5. While the phosphoryl compounds 1 and 3 show intramolecular hydrogen bridges of the type P[dbnd]O … H—O (IR spectroscopy), no analogous bridges were observed in the case of the thiophosphoryl compounds 2,4 and 5. Me2P(:O)H also reacted with diacetylmonoxime to give the mono-adduct 6 and with 1,1′-diacetylferrocene to give the di-adduct 7. In both cases the addition took place only in the presence of KO'Bu (6: excess KO'Bu, 7: catalytic amounts).
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