前周期低原子価ニオブ化合物の有機変換反応への利用　—量論反応から触媒反応へ—

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  • Early Transition Niobium Compounds in Organic Transformation—From Stoichiometric Reaction to Catalytic Reaction
  • 前周期低原子価ニオブ化合物の有機変換反応への利用 : 量論反応から触媒反応へ
  • ゼン シュウキ テイゲンシカ ニオブ カゴウブツ ノ ユウキ ヘンカン ハンノウ エ ノ リヨウ : リョウロン ハンノウ カラ ショクバイ ハンノウ エ
  • Early Transition Niobium Compounds in Organic Transformation^|^mdash;From Stoichiometric Reaction to Catalytic Reaction

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This review consists mainly of stoichiometric reaction and catalytic reaction using niobium complexes. As an example of stoichiometric reaction, synthesis of 1H-indenes from the reaction of aliphatic ketones and aryl-substituted alkynes in the presence of stoichiometric amount of NbCl3(DME) has been documented. Alternatively, development of catalytic reaction of using low-valent Nb is intriguing. Our research group reported that low-valent Nb catalyzed intermolecular [2+2+2] cycloaddition reaction of alkynes with alkenes leading to tri- or tetra-substituted 1,3-cyclohexadienes in chemo- and regioselectivity. In addition, low-valent Nb catalyzed cycloaddition reaction of tert-butylacetylene with aryl-substituted nitriles to tri-substituted pyridines has been reported.

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