1083-56-3Relevant articles and documents
Catalytic activity of the titanocene complex with tolane in homogeneous hydrogenation of unsaturated hydrocarbons
Shur, V.B.,Burlakow, V.V.,Vol'pin, M.E.
, p. 303 - 308 (1992)
The titanocene complex with tolane, Cp2Ti(C2Ph2), is an effective catalyst for homogeneous hydrogenation of olefins and acetylenes at room temperature and atmospheric pressure.In the absence of unsaturated substrate, the complex readily reacts with molecu
THE CHEMISTRY OF ORGANOBISMUTH REAGENTS PART XIII LIGAND COUPLING INDUCED BY Pd(0)
Barton, Derek H. R.,Ozbalik, Nubar,Ramesh, Manian
, p. 5661 - 5668 (1988)
Palladium zero converts triphenylbismuth quantitatively to diphenyl and metallic bismuth.many other derivatives of Bi(III) and Bi(V) are similarly transformed to diaryls in excellent yield.Similar reactions with triphenylantimony and with perphenyl lead derivatives suggest that number of non-transition metal elements should show similar behaviour.Acid chlorides also react under mild conditions with triphenylbismuth under catalysis by palladium(0) to furnish phenylketones in excellent yield (with respect to the triphenylbismuth).All three phenyls are transferred when a suitable excess of the acid chloride is used.Diaryl formation is a minor side reaction.
Regiochemistry of the styrene insertion with CH2-bridged ansa-zirconocene-based catalysts
Izzo, Lorella,Napoli, Mariagrazia,Oliva, Leone
, p. 9340 - 9345 (2003)
Methylenebis(indenyl)zirconium dichloride substituted in C(3), activated by methylalumoxane, is able to give polystyrene and ethylene-styrene copolymers. In this study hydrooligomers, whose structure, determined by 13C NMR and GC-MS techniques, gives information about the regiochemistry and the stereochemistry of styrene insertion, have been purposefully prepared. The regiochemistry of the styrene insertion is related to the encumbrance of substituents in C(3). rac-[Methylene-(3-R-1-indenyl)2]ZrCl2 with R = H, CH3, or CH2CH3 induces a prevailingly secondary styrene insertion into the zirconium-carbon bond. With increasing the substituent's steric hindrance (R = CH(CH3)2), regiochemistry inversion occurs and the primary insertion becomes prevailing. The analysis of ethylene-styrene copolymers obtained in the presence of the different catalysts allows confirming the correlation between regiochemistry and comonomers' reactivity. Besides, also the stereospecificity can be evaluated from the structure of the hydrotrimers, when the insertion is primary. Whereas the isospecificity in the absence of substituents (secondary insertion) and in the presence of the tert-butyl substituent (primary insertion) is well-known, a surprising syndiospecificity is observed when the indenyl ligand bears the isopropyl substituent in C(3).
Unexpected formation of 1,4-diphenylbutylphosphinic acid from 1,4-diphenylbuta-1,3-diene and elemental phosphorus via the Trofimov–Gusarova reaction
Artem'ev, Alexander V.,Sutyrina, Anastasiya O.,Matveeva, Elena A.,Albanov, Alexander I.,Klyba, Lyudmila V.
, p. 137 - 138 (2017)
trans,trans-1,4-Diphenylbuta-1,3-diene reacts with elemental (red) phosphorus in the superbasic KOH / DMSO (H2O) system (120?°C, 3 h) to give, after acidic work-up, 1,4-diphenylbutylphosphinic acid in 48% yield.
Microwave-assisted cross-coupling and hydrogenation chemistry by using heterogeneous transition-metal catalysts: An evaluation of the role of selective catalyst heating
Irfan, Muhammed,Fuchs, Michael,Glasnov, Toma N.,Kappe, C. Oliver
, p. 11608 - 11618 (2009)
The concept of specific microwave effects in solid/liquid catalytic processes resulting from the selective heating of a microwave-absorbing heterogeneous transition-metal catalyst by using 2.45 GHz microwave irradiation was evaluated. As model transformations Ni/C-, Cu/C-, Pd/C-, and Pd/ Al 2O3-catalyzed carbon-carbon/ carbon-heteroatom cross-couplings and hydrogenation reactions were investigated. To probe the existence of specific microwave effects by means of selective catalyst heating in these transformations, control experiments comparing microwave dielectric heating and conventional thermal heating at the same reaction temperature were performed. Although the supported metal catalysts were experimentally found to be strongly microwave absorbing, for all chemistry examples investigated herein no differences in reaction rate or selectivity between microwave and conventional heating experiments under carefully controlled conditions were observed. This was true also for reactions that use low-absorbing or microwave transparent solvents, and was independent of the microwave absorbtivity of the catalyst support material. In the case of hydrogenation reactions, the stirring speed was found to be a critical factor on the mass transfer between gas and liquid phase, influencing the rate of the hydrogenation in both microwave and conventionally heated experiments.
Nesmeyanov et al.
, p. 181,184 (1978)
-
Voronkov et al.
, (1971)
-
Homocoupling of alkyl-, alkenyl-, and arylboronic acids
Falck,Mohapatra, Suchismita,Bondlela, Muralidhar,Venkataraman, Sylesh K.
, p. 8149 - 8151 (2002)
Alkyl-, alkenyl-, and arylboronic acids undergo Ag2O/CrCl2 mediated homocoupling in moderate to good yields under mild conditions. The general utility of this methodology is illustrated by an intramolecular annulation between sp and
Zinc-promoted reactions. 8. The effect of ring strain in the reduction of 1,2-dibenzoylcycloalkanes
Di Vona, Maria Luisa,Luchetti, Luciana,Rosnati, Vittorio
, p. 2949 - 2954 (1994)
Ring cleavage was the main route in the Zn reduction of 1 in neat AcOH, while selective carbonyl reduction predominated in the presence of LiCl. The less strained 2 underwent only carbonyl reduction with Zn/AcOH. The Clemmensen reduction of both 1 and 2 resulted mainly in acyclic products. The unstrained 3 was fairly resistant towards reduction, and did not undergo ring cleavage.
Grignard reagent dictated copper(I) phosphines catalyzed reductive coupling of diazo compounds: The chemistry beyond carbene generation
Kuzhalmozhi Madarasi, Packirisamy,Sivasankar, Chinnappan
, (2021/12/01)
Copper-dppf catalyzed reductive coupling of diazo compounds through terminal nitrogen is reported. However, copper catalysts are known to produce carbene from diazo compounds; the reaction conditions played an important role in the formation of diazine over carbene generation. Several control experiments have been conducted to understand the reaction mechanism and found that the formation of a copper–Mg heterobimetallic complex would be responsible for the observed reactivity pattern. The reaction produced diazine as a reductive coupling product along with biphenyl as a by-product. All the synthesized diazines have been characterized fully by using analytical and spectroscopic techniques.
CuPd Nanoparticles as a Robust Catalyst for Electrochemical Allylic Alkylation
Guo, Xuefeng,Lin, Honghong,Muzzio, Michelle,Pang, Huan,Shen, Mengqi,Sun, Shouheng,Wei, Kecheng,Williard, Paul,Yin, Zhouyang,Yu, Chao
supporting information, p. 15933 - 15936 (2020/07/04)
An efficient CuPd nanoparticle (NP) catalyst (3 nm CuPd NPs deposited on carbon support) is designed for catalyzing electrochemical allylic alkylation in water/isopropanol (1:1 v/v) and 0.2 m KHCO3 solution at room temperature. The Pd catalysis was Pd/Cu composition-dependent, and CuPd NPs with a Pd/Cu ratio close to one are the most efficient catalyst for the selective cross-coupling of alkyl halides and allylic halides to form C?C hydrocarbons with product yields reaching up to 99 %. This NP-catalyzed electrochemical allylic alkylation expands the synthetic scope of cross-coupling reactions and can be further extended to other organic reaction systems for developing green chemistry electrosynthesis methods.
