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首页> 外文期刊>Organometallics >Intermolecular highly regioselective hydroamination of alkenes with ligandless Platinum(H) catalysts in ionic solvents: Activation role of n-BU4PBrt
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Intermolecular highly regioselective hydroamination of alkenes with ligandless Platinum(H) catalysts in ionic solvents: Activation role of n-BU4PBrt

机译：在离子溶剂中用无配体的铂（H）催化剂进行烯烃的分子间高度区域选择性加氢胺化：n-BU4PBrt的活化作用

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摘要

The reaction of aniline with 1-hexene catalyzed by PtBr2 (0.3%) in the presence of n-Bu4PBr (65 equiv/Pt) at 150 degrees C affords the expected hydroamination products with a 95% Markovnikov regioselectivity (N-(2-hexyl)aniline). An activating role of n-Bu4PBr has been evidenced, which is due to the presence of the bromide ions. This accelerating effect is discussed in terms of increased basicity of the platinum center in a zwitterionic intermediate. The ligandless, inexpensive, and nontoxic PtBr2-n-Bu4PBr-H+ catalytic system allows reaching a TON = 243 after 96 h at 150 degrees C (70% yield, 95% Markovnikov regioselectivity). The same results are obtained for reactions performed in the air.
机译：在150°C的正丁基溴化铵（65当量/铂）存在下，PtBr2（0.3％）催化苯胺与1-己烯的反应，得到预期的加氢胺化产物，马尔可夫尼可夫区域选择性为95％（N-（2-己基）苯胺）。已经证明了n-Bu4PBr的激活作用，这是由于存在溴离子。根据两性离子中间体中铂中心的碱性增加来讨论这种促进作用。无配体，便宜且无毒的PtBr2-n-Bu4PBr-H +催化体系可在150摄氏度下96小时后达到TON = 243（70％收率，95％马尔可夫尼科夫区域选择性）。对于在空气中进行的反应，可以获得相同的结果。

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