C–H Bond Amination by Photochemically Generated Transient Borylnitrenes at Room Temperature: A Combined Experimental and Theoretical Investigation of the Insertion Mechanism and Influence of Substituents
作者:Matthias Filthaus、Larissa Schwertmann、Patrik Neuhaus、Rüdiger W. Seidel、Iris M. Oppel、Holger F. Bettinger
DOI:10.1021/om300063y
日期:2012.5.28
organic glasses at 4 K. The small primary kinetic isotope effect (kH/kD = 1.35) measured for 4a in mixtures of [H12]cyclohexane and [D12]cyclohexane suggests that the insertion reaction is concerted and involves the singlet state of the borylnitrene. Computations at the CBS-QB3 and CCSD(T)/TZ2P levels of theory show that the relative energies of singlet and triplet states of a wide variety of borylnitrenes
具有取代模式的许多叠氮基硼烷衍生自邻苯二酚(3),频哪醇(4a),1,2-二氨基乙烷(4b,c),1,2-乙二硫醇(4d)和1,2,4,5-合成了四羟基苯以及无环二烷氧基物质(5),并且在4c(N,N'-二甲苯基-2-叠氮基1,3,2-二氮杂硼烷)的情况下,也进行了结构表征。叠氮基硼烷在环己烷溶剂中进行光解,以研究生成的硼基氮烯经历分子间CH插入反应的趋势。分子间插入产物的产率范围从非常好(4a)到几乎消失,这取决于叠氮基硼烷的取代。对于许多硼氮化硼,在4 K下在有机玻璃中测量了零场分裂参数D。在[H 12 ]环己烷和[D]的混合物中,测量了4a的小一级动力学同位素效应(k H / k D = 1.35)。12]环己烷表明插入反应是一致的,并涉及硼氮化亚硝的单重态。在CBS-QB3和CCSD(T)/ TZ2P的理论水平上的计算表明,各种各样的硼基氮烯的单重态和三重态的相对能量,甚至它们的最