Stoichiometric reactions and catalytic dehydrogenations of amine-boranes with calcium aryloxide
Xizhou Zheng1, Jiasu Huang1, Yingming Yao1
1Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China. yaoym@suda.edu.cn xinxu@suda.edu.cn.
Abstract:
Catalysis with the main-group metal calcium conventionally relies on σ-bond metathesis to initiate the reactions. Here, we report a calcium aryloxide based on the tridentate β-diketiminato ligand, which shows transition-metal-like reactivity with dialkylamine-boranes H3B·NHR2 (R = CH3, Cy, C6H5CH2, and iPr) to afford unprecedented amine-borane coordinated complexes through CaH interactions. This calcium aryloxide was also an active catalyst in dehydrogenation of amine-boranes, and gave aminoboranes H2B[double bond, length as m-dash]NR2, as the sole product. The initiating species was a calcium amine-borane complex rather than the traditional calcium amidoborane complex formed by σ-bond metathesis.
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