Stabilization of a Chelate Tautomer of Phenylacetylide
摘要:
Complex [Ir(mu-Cl)(COE)(2)](2) (1; COE = cis-cyclooctene) reacts with Li[C5H4(CH2)(2)N(CH3)(2)] to give Ir{eta(5)-C5H4(CH2)(2)N(CH3)(2)}(COE)(2) (2), which affords IrI2-{eta(5)-C-5,kappa-N-[C5H4(CH2)(2)N(CH3)(2)]} (3), by addition of I-2. The reaction of 3 with phenylacetylene yields Ir{eta(5)-C-5, sigma- C-a,sigma-C-b-[C5H4(CH2)(2)N(CH3)(2)C-a=CHC-(CH)(4)-C-b]} (4), which has been characterized by X-ray diffraction analysis.
Generation of Nucleophilic Chromium Acetylides from gem-Trichloroalkanes and Chromium Chloride: Synthesis of Propargyl Alcohols
作者:Dhurke Kashinath、Steve Tisserand、Narender Puli、John R. Falck、Rachid Baati
DOI:10.1002/ejoc.200901476
日期:2010.4
terminal alkynes, formed in situ through the Fritsch- Buttenberg-Wiechell (FBW) rearrangement, whereas Cr(III) acetylides are concomitantly generated by HCl elimination from the chromium(III) vinylidene carbenoid. Both divergent pathways result, overall, in the formation of nucleophilic acetylides. In situ trapping with electrophilic aldehydes afforded propargyl alcohols. Furthermore, deuteration experiments
Synthesis of cis and trans Bis-alkynyl Complexes of Cr(III) and Rh(III) Supported by a Tetradentate Macrocyclic Amine: A Spectroscopic Investigation of the M(III)–Alkynyl Interaction
作者:Chivin Sun、Christopher R. Turlington、W. Walsh Thomas、James H. Wade、Wade M. Stout、David L. Grisenti、William P. Forrest、Donald G. VanDerveer、Paul S. Wagenknecht
DOI:10.1021/ic2009336
日期:2011.10.3
than for the analogous Rh(III) complexes, a result that can be interpreted in terms of the alkynyl ligands acting as π-donors. UV–vis spectra of the Cr(III) and Rh(III) complexes are dominated by strong charge transfer (CT) transitions. In the case of the Rh(III) complexes, these CT transitions obscure the metal centered (MC) transitions, but in the case of the Cr(III) complexes the MC transitions are
[M(cyclam)(CCR)2 ] OTf类型的炔基配合物(其中cyclam = 1,4,8,11-四氮杂十四烷; M = Rh(III)或Cr(III); R =苯基,4-甲基苯基(4-三氟甲基苯基,4-氟苯基,1-萘基,9-菲基和环己基)的制备方法为一锅法合成,其中将2当量的RCCH和4当量的BuLi加入到在THF中合适的[M(cyclam)(OTf)2 ] OTf络合物。使用溶解度差异分离炔基配合物的顺式和反式异构体,并使用红外光谱法对CH 2摇摆和NH弯曲区域进行立体化学表征。所有的反式-[M(cyclam)(CCR)2]光学传递函数显示出复合物2071和2109厘米之间的强拉曼频带-1,归因于ν小号(C≡C)。Cr(III)配合物的拉伸频率比类似的Rh(III)配合物低21–28 cm –1,这一结果可以用炔基配体作为π供体来解释。Cr(III)和Rh(III)配合物的紫外可见
Synthesis of the Tantalum Hydride Complex (<i>R,R</i>)-[Ta(O<sub>2</sub>C<sub>20</sub>H<sub>10</sub>{SiMe<sub>3</sub>}<sub>2</sub>-3,3‘)<sub>2</sub>(H)] and Reactivity with Aldehydes, Ketones, Acetylenes, and Related Substrates: A Reagent for the Asymmetric Hydrogenation of Prochiral Carbonyl Species
作者:Charles S. Weinert、Phillip E. Fanwick、Ian P. Rothwell
DOI:10.1021/om050633s
日期:2005.11.1
benzaldehyde-d to give alkoxide complexes that are chiral at the α-carbon. The progress of these reactions was monitored by 13C NMR spectroscopy. An X-ray crystalstructure of one of the products (R,R,R)/(R,R,S)-[Ta(O2C20H10SiMe3}2-3,3‘)2(OCHCH3}Ph})(OCCH3}Ph})] was obtained, and the catalytic conversion of benzaldehyde-d to benzyl alcohol-d was carried out using (R,R)-2. The hydride complex also reacts
钽苯基络合物(R,R)-[Ta(O 2 C 20 H 10 SiMe 3 } 2 -3,3')2(Ph)],(R,R)-1是由[H 2 NEt 2 ] [Ta(O 2 C 20 H 10 SiMe 3 } 2 -3,3')2 Cl 2 ],已被用于合成氢化物(R,R)-[Ta(O 2) ç 20 ħ10 SiMe 3 } 2 -3,3')2(H)],(R,R)-2通过与氢化二异丁基铝(DIBAL-H)反应。反应干净且高收率地进行。化合物(R,R)-2与苯乙酮和苯甲醛-d进行清洁反应,生成在α碳上手性的醇盐配合物。这些反应的进程通过13 C NMR光谱监测。(R,R,R)/(R,R,获得S)-[Ta(O 2 C 20 H 10 SiMe 3 } 2 -3,3')2(OCH CH 3 } Ph})(O C CH 3 } Ph}))。苯甲醛-d催化转化为苯甲醇-d的反应是使用(R
Design Strategies for Luminescent Titanocenes: Improving the Photoluminescence and Photostability of Arylethynyltitanocenes
作者:Matilda Barker、Thomas J. Whittemore、Henry C. London、Jack M. Sledesky、Elizabeth A. Harris、Tiffany M. Smith Pellizzeri、Colin D. McMillen、Paul S. Wagenknecht
DOI:10.1021/acs.inorgchem.3c02712
日期:2023.10.30
the decomposition of a structurally constrained analogue, Cp2Ti(OBET) (OBET = o-bis(ethynyl)tolane). To investigate the mechanism of nonradiative decay from the 3LMCT states in Cp2Ti(C2Ph)2CuX, the photophysical properties were investigated both upon deuteration and upon rigidifying in a poly(methyl methacrylate) film. These investigations suggested that inhibition of structural rearrangement may play