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62.091 Aktuelle Fachpublikationen zum Thema Addition

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Total Synthesis of Pipecolic Acid and 1-C-Alkyl 1,5-Iminopentitol Derivatives by way of Stereoselective Aldol Reactions from (S)-Isoserinal

24.01.2018 | Sebastian Baś; Rafał Kusy; Monika Pasternak-Suder; Cyril NICOLAS; Jacek Mlynarski; Olivier Martin, Organic & Biomolecular Chemistry, 2018

A short synthesis of iminosugars and pipecolic acid derivatives has been realized through aldol addition of a pyruvate, a range of ketones and (S)-isoserinal, followed by catalytic reductive intramolecular amination. The stereoselective aldol reaction was achieved successfully by using tertiary ...

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Preparation of supramolecular silicone elastomers via homo- and hetero-assembly

24.01.2018 | Jinfeng Cao; Linglong Feng; Shengyu Feng, New Journal of Chemistry, 2018

Supramolecular silicone elastomers were first prepared via the self-assembly of nucleobase-functionalized polysiloxanes which were synthesized by a catalyst-free aza-Michael reaction. The nucleobases adenine (A) and thymine (T) form A–A, T–T, and A–T hydrogen bonding via base pair recognition. ...

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Computational evidence for a reaction pathway bifurcation in Sasaki-type (4+3)-cycloadditions.

23.01.2018 | Jed Marcus Burns, Organic & Biomolecular Chemistry, 2018

The current report seeks to validate the existence of a post-transition state bifurcation in the Lewis acid-catalysed (4+3)-cycloaddition of butadiene and α-methoxy acrolein. Cycloaddition transition state (TS) structures are shown by intrinsic reaction coordinate (IRC) and potential energy ...

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Electrocatalytic CO2 reduction by a cobalt bis(pyridylmonoimine) complex: effect of acid concentration on catalyst activity and stability

23.01.2018 | Weixuan Nie; Charles McCrory, Chemical Communication, 2018

A Co complex with a redox-active bis(pyridylmonoimine) ligand has been prepared and shows catalytic activity for electrochemical CO2 reduction in acetonitrile. Addition of a proton source such as water or trifluoroethanol dramatically improves the activity and stability of the molecular catalyst. ...

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Enhancing Lithium-Ion Conductivity in NASICON Glass-Ceramics by Adding Yttria

23.01.2018 | Victor Vizgalov; Tina Nestler; Lev A. Trusov; Ivan Bobrikov; Olexandr I. Ivankov; Mikhail Avdeev; Mykhaylo Motylenko ..., CrystEngComm, 2018

We demonstrate that the ionic conductivity of Li1+xAlxGe2-x(PO4)3 glass-ceramic electrolytes can be tailored by Y2O3 additive to Li2O–Al2O3–GeO2–P2O5 melts. We found that addition of 5 vol. % of Y2O3 causes noticeable changes in further glass crystallization process as the key parameters (glass ...

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DFT modelling of a diphosphane − N-heterocyclic carbene-Rh(I) pincer complex rearrangement: A computational evaluation of the electronic effects in C-P bond activation

23.01.2018 | Hua-Li Qin; Jing Leng; Wenqin Zhang; Eric Assen Bonev A B Kantchev, Dalton Transactions, 2018

DFT calculations confirm that rearrangement of a PCP-Rh-H pincer to a CCP-Rh-phosphane pincer occurs by C-P oxidative addition (G‡ = 29.5 kcal mol-1, rate-determining) followed by P-H reductive elimination (G‡ = 4.8 kcal mol-1). The oxidative addition proceeds by 3-centered transition state and ...

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Truncated concave octahedral Cu2O nanocrystals with {hkk} high-index facets for enhanced activity and stability in heterogeneous catalytic azide-alkyne cycloaddition

23.01.2018 | Zelun Zhao; Xue Wang; Jiaqi Si; Chengtao yue; Chungu Xia; Fuwei Li, Green Chemistry, 2018

We report a facile synthesis of Cu2O truncated concave octahedral nanocrystals mainly with {511} high-index facets in a system of oil in water emulsion. In azide-alkyne cycloaddition with water as a green solvent, Cu2O truncated concave octahedra showed greatly enhanced activity with turnover ...

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Experimental and numerical effect of active afterheater addition on the growth of Langatate (La3Ga5.5Ta0.5O14) crystals by Czochralski method

23.01.2018 | Idir Lasloudji; Faiza Mokhtari; Abdeldjelil Nehari; Guillaume Alombert-Goget; Kheirreddine Lebbou, CrystEngComm, 2018

Czochralski (Cz) technique with Argon/Oxygen atmosphere has been used to grow 35mm diameter (La3Ga5.5Ta0.5O14) Langatate (LGT) crystals along Z-axis. Addition of an afterheater is proposed to improve the growth and the crystal properties. Two furnace configurations without and with an afterheater ...

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Remarkable increase in the rate of the catalytic epoxidation of electron deficient styrenes through the addition of Sc(OTf)3 to the MnTMTACN catalyst

23.01.2018 | Aneta Nodzewska; Michael Watkinson, Chemical Communication, 2018

The effect of Lewis acids on the catalytic activity of [Mn2(μ-O)3(TMTACN)2](PF6)2 in the epoxidation of styrenes using hydrogen peroxide as the oxidant has shown that the addition of Sc(OTf)3 at low catalytic loading results in a very significant increase in the efficiency of the catalyst and a ...

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Lithium diamidodihydridoaluminates: bimetallic cooperativity in catalytic hydroboration and metallation applications

23.01.2018 | Victoria A. Pollard; Samantha A. Orr; Ross McLellan; Alan R. Kennedy; Eva Hevia; Robert E. Mulvey, Chemical Communication, 2018

Cooperativity between the Li and Al centres is implicated in catalytic hydroboration reactions of aldehydes and ketones with pinacolborane via heteroleptic lithium diamidodihydridoaluminates. In addition to implementing hydroalumination, these versatile heteroleptic ates can also perform as amido ...

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