Homogeneous Catalytic Dehydrocoupling/Dehydrogenation of Amine−Borane Adducts by Early Transition Metal, Group 4 Metallocene Complexes
作者:Matthew E. Sloan、Anne Staubitz、Timothy J. Clark、Christopher A. Russell、Guy C. Lloyd-Jones、Ian Manners
DOI:10.1021/ja909535a
日期:2010.3.24
The efficient catalytic dehydrocoupling of a range of amine-borane adducts, R'RNH x BH(3) (R' = R = Me 1a; R' = R = (i)Pr 1b; R' = Me, R = CH(2)Ph 1c) by a series of group 4 metallocene type precatalysts has been demonstrated. A reduction in catalytic activity was detected upon descending the group and also on substitution of the cyclopentadienyl (Cp) ligands with sterically bulky or electron-donating
B-Methylated Amine-Boranes: Substituent Redistribution, Catalytic Dehydrogenation, and Facile Metal-Free Hydrogen Transfer Reactions
作者:Naomi E. Stubbs、André Schäfer、Alasdair P. M. Robertson、Erin M. Leitao、Titel Jurca、Hazel A. Sparkes、Christopher H. Woodall、Mairi F. Haddow、Ian Manners
DOI:10.1021/acs.inorgchem.5b01946
日期:2015.11.16
dehydrogenation chemistry of amine-boranes substituted at nitrogen has attracted considerable attention, much less is known about the reactivity of their B-substituted analogues. When the B-methylated amine-borane adducts, RR′NH·BH2Me (1a: R = R′ = H; 1b: R = Me, R′ = H; 1c: R = R′ = Me; 1d: R = R′ = iPr), were heated to 70 °C in solution (THF or toluene), redistribution reactions were observed involving
尽管在氮上取代的胺-硼烷的脱氢化学引起了相当大的关注,但对它们的B-取代的类似物的反应性知之甚少。当B-甲基化胺-硼烷加合物时,RR'NH·BH 2 Me(1a:R = R'= H; 1b:R = Me,R'= H; 1c:R = R'= Me; 1d:R = R'= i Pr),在溶液(THF或甲苯)中加热到70°C,观察到重新分布反应,包括硼上甲基和氢取代基的明显扰乱,提供了RR'NH·BH的混合物3– x Me x(x= 0–3)。推测这些反应是通过胺-硼烷离解,然后可逆地形成乙硼烷中间体和加合物重整而发生的。Dehydrocoupling的1A - 1D在THF与铑(I),铱(III)和Ni(0)的预催化剂在20℃下导致的制品阵列,包括氨基硼烷RR'N═BHMe,环状diborazane [RR'N- BHMe] 2和硼嗪[RN–BMe] 3基于原位11 B NMR光谱分析,并通过
Studies of aminoboranes. Part II. Pyrolysis of monoalkylamine-boranes: some aminoborane trimers (1,3,5-trialkylcyclotriborazanes) and dimers
作者:M. P. Brown、R. W. Heseltine、L. H. Sutcliffe
DOI:10.1039/j19680000612
日期:——
Trimericaminoboranes (RNH·BH2)3, where R = Me, Et, Pr, Bu, and But, each of which occurs in two forms, have been prepared by pyrolyses of the corresponding amine-boranes RNH2,BH3. The dimeric aminoborane (ButNH·BH2)2 was also obtained from pyrolysis of ButNH2,BH3 and a similar dimer (PriNH·BH2)2 was the only aminoborane which could be isolated from the pyrolysis of PriNH2,BH3. Proton magnetic resonance
Synthesis of Group IV (Zr, Hf)−Group VIII (Fe, Ru) Heterobimetallic Complexes Bearing Metallocenyl Diphosphine Moieties and Their Application to Catalytic Dehydrogenation of Amine−Boranes
A series of heterobimetallic complexes, including [M1Me(μ-η5:η1-C5H4PEt2)2M2Cp*] (5a, M1 = Zr, M2 = Ru; 5b, M1 = Hf, M2 = Ru; 5c, M1 = Zr, M2 = Fe) have been prepared and characterized by X-ray analyses. Dehydrogenation of Me2NH·BH3 takes place in the presence of a catalytic amount of these heterobimetallic complexes. Studies on the reaction pathway of the catalytic dehydrogenation of Me2NH·BH3 lead
Heterogeneous Dehydrocoupling of Amine–Borane Adducts by Skeletal Nickel Catalysts
作者:Alasdair P. M. Robertson、Riccardo Suter、Laurent Chabanne、George R. Whittell、Ian Manners
DOI:10.1021/ic201809g
日期:2011.12.19
transition metal. Catalytic dehydrocoupling of Me2NH·BH3 (1) and Et2NH·BH3 (5) was demonstrated using 5 mol % skeletal Ni catalyst at 20 °C and produced [Me2N–BH2]2 (2) and [Et2N–BH2]2/Et2N═BH2 (6), respectively. The related adduct iPr2NH·BH3 (7) was also dehydrogenated to afford iPr2N═BH2 (8) but with significant catalyst deactivation. Catalytic dehydrocoupling of MeNH2·BH3 (9) was found to yield the