Cationic Nickel(II)-Catalyzed Hydrosilylation of Alkenes: Role of P, N-Type Ligand Scaffold on Selectivity and Reactivity
作者:Istiak Hossain、Joseph A. R. Schmidt
DOI:10.1021/acs.organomet.0c00551
日期:2020.9.28
Seven structurally similar cationic nickel(II)–alkyl complexes were synthesized by using a series of P, N ligands, and their reactivity was explored in the hydrosilylation of alkenes. More electron-rich phosphines enhanced the overall reactivity of the transformation; in contrast, groups on the imine donor had little impact. Overall, these catalysts displayed reactivity and selectivity that was previously
1-D manganese(<scp>ii</scp>)-terpyridine coordination polymers as precatalysts for hydrofunctionalisation of carbonyl compounds
作者:Guoqi Zhang、Haisu Zeng、Sihan Li、Jahvon Johnson、Zixuan Mo、Michelle C. Neary、Shengping Zheng
DOI:10.1039/c9dt04637b
日期:——
importance and shows potential in replacing precious metal catalysis. In this work, we revealed catalytic hydroboration and hydrosilylation of ketones and aldehydes achieved by a structurally defined manganese(ii) coordination polymer (CP) as a precatalyst under mild conditions. The manganese-catalysed methodology can be applied to a range of functionalized aldehydes and ketones with turnover numbers (TON)
Cobalt-Catalyzed Regiodivergent Hydrosilylation of Vinylarenes and Aliphatic Alkenes: Ligand- and Silane-Dependent Regioselectivities
作者:Chao Wang、Wei Jie Teo、Shaozhong Ge
DOI:10.1021/acscatal.6b02518
日期:2017.1.6
hydrosilylation of alkenes catalyzed by catalysts generated in situ from bench-stable Co(acac)2 and phosphine- or nitrogen-based ligands. A wide range of vinylarenes and aliphatic alkenes reacted to afford either branched (45 examples) or linear (37 examples) organosilanes in high isolated yields (average: 84%) and high regioselectivities (from 91:9 to >99:1). This transformation tolerates a variety of functional
A β-diketiminate manganese catalyst for alkene hydrosilylation: substrate scope, silicone preparation, and mechanistic insight
作者:Tufan K. Mukhopadhyay、Marco Flores、Thomas L. Groy、Ryan J. Trovitch
DOI:10.1039/c8sc02768d
日期:——
A (BDI)Mn catalyst has been found to hydrosilylate olefins and the observed selectivity can be attributed to alkene insertion.
一种(BDI)Mn催化剂已被发现可以对烯烃进行氢硅化反应,观察到的选择性可以归因于烯烃插入。
R-Allyl Nickel(II) Complexes with Chelating N-Heterocyclic Carbenes: Synthesis, Structural Characterization, and Catalytic Activity
作者:Lourdes Benı́tez Junquera、M. Carmen Puerta、Pedro Valerga
DOI:10.1021/om200937d
日期:2012.3.26
The N-heterocyclic carbene (NHC) nickel complexes [(L)Ni(NHC)][BAr4F] (Ar-F = 3,5-bis(trifluoromethyl)-phenyl; L = allyl (1), methylallyl (2); NHC = 1-(2-picolyl)-3-methylimidazol-2-ylidene (a), 1-(2-picolyl)-3-isopropylimidazol-2-ylidene (b), 1-(2-picolyl)-3-n-butylimidazol-2-ylidene (c), 1-(2-picolyl)-3-phenylimidazol-2-ylidene (d), 1-(2-picolyl)-3-methylbenzoimidazol-2-ylidene (e), 1-(2-picolyl)-4,5-dichloro-3-methylimidazol-2-ylidene (0) have been obtained in high yields and characterized by NMR spectroscopy. Furthermore, Id was unambiguously characterized by single-crystal X-ray crystallography. Complexes 1a-f/2a-f have shown catalytic activity toward dimerization and hydrosilylation of styrenes. In particular, 1a proved to be the most efficient catalyst in the dimerization of styrene derivatives in the absence of cocatalyst. Also, complexes 1a,d showed high selectivity and moderate to good yields in hydrosilylation reactions.