The metalla-Pinner reaction between Pt(<scp>iv</scp>)-bound nitriles and alkylated oxamic and oximic forms of hydroxamic acids
作者:Konstantin V. Luzyanin、Vadim Yu. Kukushkin、Matti Haukka、J. J. R. Fraústo da Silva、Armando J. L. Pombeiro
DOI:10.1039/b406600f
日期:——
The nitrile ligands in the platinum(IV) complexes trans-[PtCl4(RCN)2] (R = Me, Et, CH2Ph) and cis/trans-[PtCl4(MeCN)(Me2O)] are involved in a metalla-Pinner reaction with N-methylbenzohydroxamic acid (N-alkylated form of hydroxamic acid, hydroxamic form; F1), PhC(O)N(Me)OH, to achieve the imino species [PtCl4NHC(R)ON(Me)C(O)Ph}2] (1–3) and [PtCl4NHC(Me)ON(Me)C(O)Ph}(Me2O)] (7), respectively. Treatment of trans-[PtCl4(RCN)2] (R = Me, Et) and cis/trans-[PtCl4(MeCN)(Me2O)] with the O-alkylated form of a hydroxamic acid (hydroximic form), i.e. methyl 2,4,6-trimethylbenzohydroximate, 2,4,6-(Me3C6H2)C(OMe)NOH (F2A), allows the isolation of [PtCl4NHC(R)ONC(OMe)(2,4,6-Me3C6H2)}2] (5, 6) and [PtCl4NHC(Me)ONC(OMe)(2,4,6-Me3C6H2)}(Me2O)] (8), correspondingly. In accord with the latter reaction, the coupling of nitriles in trans-[PtCl4(EtCN)2] with methyl benzohydroximate, PhC(OMe)NOH (F2B), gives [PtCl4NHC(Et)ONC(OMe)Ph}2] (4). The addition proceeds faster with the hydroximicF2, rather than with the hydroxamic form F1. The complexes 1–8 were characterized by C, H, N elemental analyses, FAB+ mass-spectrometry, IR, 1H and 13C1H} NMR spectroscopies. The X-ray structure determinations have been performed for both hydroxamic and hydroximic complexes, i.e. 2 and 6, indicating that the imino ligands are mutually trans and they are in the E-configuration.
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