Insertion Reactions and Catalytic Hydrophosphination of Heterocumulenes using α-Metalated <i>N</i>,<i>N</i>-Dimethylbenzylamine Rare-Earth-Metal Complexes
作者:Andrew C. Behrle、Joseph A. R. Schmidt
DOI:10.1021/om300807k
日期:2013.3.11
dimethylbenzylamine) was probed through a series of stoichiometric insertion and catalytic hydrophosphination reactions. Both rare-earth-metal species inserted 3 equiv of various carbodiimides to form the corresponding homoleptic amidinates. α-La(DMBA)3 was also found to be a useful precatalyst for the room-temperature hydrophosphination of heterocumulenes to form phosphaguanidines, phosphaureas, and phosphathioureas
Iron(II)-Catalyzed Hydrophosphination of Isocyanates
作者:Helen R. Sharpe、Ana M. Geer、William Lewis、Alexander J. Blake、Deborah L. Kays
DOI:10.1002/anie.201701051
日期:2017.4.18
The first transition metal catalyzed hydrophosphination of isocyanates is presented. The use of low‐coordinate iron(II) precatalysts leads to an unprecedented catalytic double insertion of isocyanates into the P−H bond of diphenylphosphine to yield phosphinodicarboxamides [Ph2PC(=O)N(R)C(=O)N(H)R], a new family of derivatized organophosphorus compounds. This remarkable result can be attributed to the
An efficient catalytic method for hydrophosphination of heterocumulenes with diethylzinc as precatalyst without a solvent
作者:Bingyi Zhang、Xiaoli Ma、Ben Yan、Congjian Ni、Hailong Yu、Zhi Yang、Herbert W. Roesky
DOI:10.1039/d1dt02706a
日期:——
Commercially available compound ZnEt2 acts as an efficient precatalyst for the solvent-free hydrophosphinations of heterocumulenes using Ph2PH as reagent. As far as we knew, this has been not reported in group 12 metal catalyzing reactions. A suggested mechanism of this reaction is explored, and the intermediate [Ph2PC(NiPr)2}ZnEt]2 is obtained and characterized by a single-crystal X-ray structural
市售化合物 ZnEt 2作为一种有效的预催化剂,用于使用 Ph 2 PH 作为试剂的杂枯草烯的无溶剂氢膦化反应。据我们所知,这在第 12 族金属催化反应中尚未见报道。探索了该反应的建议机制,获得了中间体 [Ph 2 PC(N i Pr) 2 }ZnEt] 2并通过单晶 X 射线结构分析对其进行了表征。
The first ring-expanded NHC–copper(<scp>i</scp>) phosphides as catalysts in the highly selective hydrophosphination of isocyanates
作者:Thomas M. Horsley Downie、Jonathan W. Hall、Thomas P. Collier Finn、David J. Liptrot、John P. Lowe、Mary F. Mahon、Claire L. McMullin、Michael K. Whittlesey
DOI:10.1039/d0cc05694d
日期:——
first reports of ring-expanded NHC–copper(I) phosphides. The compounds were characterised by NMR spectroscopy and X-ray crystallography. Reaction of (6-Dipp)CuPPh2 with isocyanates, isothiocyanates and carbon disulfide results in the insertion of the heterocumulene into the Cu–P bond. The NHC–copper phosphides were found to be the most selective catalysts yet reported for the hydrophosphination of isocyanates
The bis(NHC) (NHC = N-heterocyclic carbene)-based CNC-pincer rare-earth-metal amido complexes LRE[N(SiMe3)(2)](2) (L = 4-CH3-2-R-[N(CH)(2)CN]}C6H3](2)N; L2, R = CH3; L3, R = CH(CH3)(2)) were synthesized and characterized, and their catalytic activities toward hydrophosphination of heterocumulenes were developed. Reactions of bis[2-(3-methylimidazolium)-4-methylphenyl]amine diiodide (H3L2I(2)) or bis[2-(3-isopropylimidazolium)-4-methylphenyl]amine diiodide (H3L2I(2)) with 5 equiv of NaN(SiMe3)(2) followed by treatment with 1 equiv of RECl3 in THF at -78 C afforded the bis(NHC)-based CNC-pincer rare-earth-metal amido complexes LRE[N(SiMe3)(2)](2) (L2 = [4-CH3-2-CH3-[N(CH)(2)CN]}C6H3](2)N, RE = Y (1), Eu (2), Er (3); L-3 = [4-CH3-2-(CH3)(2)CH-[N(CH)(2)CN]}C6H3](2)N, RE = Y (4), Er (5), Yb (6)). Complexes 46 can also be prepared by stepwise reactions of H3L-3I-2 with n-BuLi in THF followed by reactions with [(Me3Si)2N]3RE(mu-Cl)Li(THF)3. Stepwise reactions of H3L3I(2) with n-BuLi in THF followed by treatment with [(Me3Si)(2)N](3)RE(mu-Cl)Li(THF)(3) generated the bis(NHC)-based CNC-pincer rare-earth-metal amido complexes L2RE[N-(SiMe3)(2)](2) (RE = Y (1), Er (3)) together with the fused-heterocyclic compound 3,8,9-trimethyl-8a,9-dihydro-8H-benzo[4,5]imidazo[2',1':2,3]imidazo[1,2-a]imidazo[2,1-c]quinoxaline (7), which formed through carbene CC and CN coupling. Attempts to prepare complexes of the type LRE[N(SiMe3)(2)](2) by reaction of H3L3I(2) with [(Me3Si)(2)N](3)Yb(mu-Cl)Li(THF)(3) in THF, however, afforded mixed complexes of the bis(NHC)-based CNC-pincer ytterbium complex L3Yb[N(SiMe3)(2)](2) (6) and the unexpected bis(NHC)-based CNC-pincer monoamido ytterbium iodide L3YbI[N(SiMe3)(2)] (8). Investigation of the catalytic activity of complexes 16 and 8 indicated that all complexes displayed high activity toward the addition of the phosphine PH bond to heterocumulenes, producing the corresponding phosphaguanidines, phosphaureas, and phosphathioureas, which represents the first example of bis(NHC)-based CNC-pincer type rare-earth-metal amido complexes as catalysts for the catalytic addition of the phosphine PH bond to heterocumulenes with high efficiency in the presence of a low catalyst loading at room temperature