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- W2330882562 abstract "The synthesis of the first 4-methoxy-substituted 1,3-benzazaphosphole was accomplished by using a <i>C</i>,<i>O</i>-dilithium intermediate generated from <i>N</i>-(3-methoxyphenyl)-2,2-dimethylpropanamide and butyllithium. This intermediate was subjected either to direct phosphonylation or to a bromination and phosphonylation sequence; subsequent reductive cyclization with excess lithium aluminum hydride led to the desired product. In addition, <i>N</i>-(2,2-dimethylpropyl)-3-methoxy-2-phosphinoaniline, formed in a side reaction, was cyclized with (dimethoxymethyl)dimethylamine to give 1-(2,2-dimethylpropyl)-4-methoxy-1<i>H</i>-1,3-benzazaphosphole. The behavior of these +<i>M</i>-substituted π-excess aromatic σ<sup>2</sup> <i>P</i>-heterocycles towards moisture is reported, together with their <sup>1</sup>H, <sup>13</sup>C, and <sup>31</sup>P solution NMR spectra and a crystal-structure analysis. The new compounds represent potential σ<sup>2</sup> <i>P</i>,<i>O</i> hybrid or chelate ligands with a high π-density at the phosphorus atom." @default.
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- W2330882562 date "2014-04-24" @default.
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- W2330882562 title "π-Excess σ2 P,O Hybrid Ligands: Synthesis of the First 4-Methoxy-1H-1,3-benzazaphospholes" @default.
- W2330882562 doi "https://doi.org/10.1055/s-0033-1341225" @default.
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