Hydride Transfer Reactions of Transition Metal Hydrides: Kinetic Hydricity of Metal Carbonyl Hydrides
作者:Tan-Yun Cheng、Bruce S. Brunschwig、R. Morris Bullock
DOI:10.1021/ja9820036
日期:1998.12.1
Hydride transfer from neutral transition metalhydrides (MH) to Ph3C+BF4- gives M-FBF3 and Ph3CH. The rate law −d[Ph3C+BF4-]/dt = k[Ph3C+BF4-][MH] was established from kinetic measurements using stopped-flow methods. Second-order rate constants determined in CH2Cl2 solution at 25 °C range from kH− = 7.2 × 10-1 M-1 s-1 to kH− = 4.6 × 106 M-1 s-1. The order of increasing kinetic hydricity is (C5H4CO2Me)(CO)3WH
Metal-Free Regio- and Chemoselective Hydroboration of Pyridines Catalyzed by 1,3,2-Diazaphosphenium Triflate
作者:Bin Rao、Che Chang Chong、Rei Kinjo
DOI:10.1021/jacs.7b09754
日期:2018.1.17
(NHP-OTf) 1 serve as efficient catalysts for the regio- and chemoselective hydroboration of pyridines under ambient condition with good functional group tolerance. Mechanistic studies indicate that a boronium salt, [(Py)2·Bpin]OTf 4, is generated concomitant with NHP-H 5 via hydride abstraction from HBpin by 1 in the initial reaction step. Hydride reduction of the activated pyridine in [(Py)2·Bpin]OTf
Accessing Low-Valent Inorganic Cations by Using an Extremely Bulky N-Heterocyclic Carbene
作者:Matthew M. D. Roy、Paul A. Lummis、Michael J. Ferguson、Robert McDonald、Eric Rivard
DOI:10.1002/chem.201703215
日期:2017.8.22
The extremely bulkyN‐heterocycliccarbene (NHC), ITr (ITr=[(HCNCPh3)2C:]) featuring sterically shielding umbrella‐shaped trityl (CPh3) substituents was prepared. This NHC features the highest percent buried volume (%Vbur) to date, and was used to form a thermally stable quasi one‐coordinate thallium(I) cation [ITr‐Tl]+. This TlI adduct and the corresponding lithium complex [ITr⋅Li(OEt2)]+ are versatile
Bicyclo[3.2.1]amide-DNA: Synthesis and Base-Pairing Properties
作者:Anita Egger、Christian J. Leumann
DOI:10.1055/s-1999-3113
日期:——
A new oligonucleotide analog, bicyclo[3.2.1]-amide-DNA was synthesized. A homo-adenylate sequence of this analog, efficiently forms hetero-duplexes with complementary natural DNA and RNA. The corresponding homo-thymidylate sequence, however, does not base-pair to complementary DNA and RNA, but forms a stable duplex with the homo-adenylate oligomer of the same backbone type. The structure of this duplex is virtually enantiomeric to that of a natural B-DNA, as inferred from CD-spectroscopy.
我们合成了一种新的寡核苷酸类似物--双环[3.2.1]酰胺-DNA。这种类似物的同源腺苷酸序列能有效地与互补的天然 DNA 和 RNA 形成异源双链。然而,相应的胸苷酸同源序列不会与互补 DNA 和 RNA 发生碱基配对,而是与相同骨架类型的腺苷酸同源寡聚体形成稳定的双链体。根据 CD 光谱推断,这种双链体的结构与天然 B-DNA 的结构几乎是对映的。
[(C<sub>5</sub>Me<sub>5</sub>)<sub>2</sub>U(Me)(OTf)]<sub>2</sub>: A New Reagent for Uranium Metallocene Chemistry. Preparation of the First Actinide Hydrazonato Complexes
作者:Jaqueline L. Kiplinger、Kevin D. John、David E. Morris、Brian L. Scott、Carol J. Burns
DOI:10.1021/om0205804
日期:2002.10.1
The synthesis and characterization of the first actinide hydrazonato complex, (C5Me5)2U(η2(N,N‘)-CH3NNCPh2)(OTf) (3), has been made possible by use of the organouranium(IV) trifluoromethanesulfonate (triflate) complex [(C5Me5)2U(CH3)(OTf)]2 (2; OTf = OSO2CF3), which is derived from the reaction between (C5Me5)2U(CH3)2 and Ph3COTf. The related chemistry for (C5Me5)2U(CH3)(Cl) is also reported. All new
合成和第一锕hydrazonato复杂的表征,(C 5我5)2 U(η 2(Ñ,Ñ “)-CH 3 NN器CPh 2)(OTF)(3),已被使用的成为可能有机铀(IV)三氟甲磺酸盐(三氟甲磺酸盐)络合物[(C 5 Me 5)2 U(CH 3)(OTf)] 2(2; OTf = OSO 2 CF 3),它是由(C 5 Me 5)2U(CH 3)2和Ph 3 COTf。还报道了(C 5 Me 5)2 U(CH 3)(Cl)的相关化学。所有新的复合物均已在结构上进行了表征。