Synthesis and Reactivity of the CO2 Adducts of Amine/Bis(2,4,6-tris(trifluoromethyl)phenyl)borane Pairs

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• 作者：Zhenpin Lu ; Yuwen Wang ; Jia Liu ; Yue-jian Lin ; Zhen Hua Li ; Huadong Wang
• 刊名：Organometallics
• 出版年：2013
• 出版时间：November 25, 2013
• 年：2013
• 卷：32
• 期：22
• 页码：6753-6758
• 全文大小：346K
• 年卷期：v.32,no.22(November 25, 2013)
• ISSN：1520-6041

文摘

Frustrated Lewis pairs (FLPs) comprised of bis(2,4,6-tris(trifluoromethyl)phenyl)borane (1) and a secondary amine (such as HNiPr₂ or HNEt₂) readily react with CO₂ at room temperature to afford ammonium carbamatoborate salts 2. When the reaction was carried out at 80 掳C, carbamate boryl esters 3 were obtained with release of 1 equiv of H₂. The iPr-substituted carbamate boryl ester 3a can function as an intramolecular FLP to activate H₂, affording ammonium borylformate salt 4a and formamide adduct 5a. Two reaction pathways leading to the formation of 4a and 5a are proposed.