Results 11 to 20 of about 1,240 (135)

One-Pot Synthesis of 5,6-Dihydro-4H-1,2-Oxazines by Cyclization of Ketoximes with Derivatives of Allylbenzene [PDF]

JOURNAL OF ADVANCES IN CHEMISTRY, 2010
A new series of 5,6-dihydro-4H-1,2-oxazines were synthesized via hetero Diels-Alder reaction of  α-nitrosolefins with derivatives of allylbenzene. α-Nitrosoolefins were generated from ketoximes by the action of chloramine-T and triethylamine.
P. T. Sowmya, Ebraheem Abdu Musad, K. M. Lokanatha Rai, Raad Kasim Yahya   +3 more
openaire   +4 more sources

Boosting the Nucleophilicity of the Diphenylphosphide Anion with Crown Ether Supported Heavy Alkali Metals to Facilitate Highly Efficient Catalytic Alkene Isomerisation. [PDF]

Angew Chem Int Ed Engl
Here, we report a breakthrough study in catalytic alkene isomerisation using crown ether‐supported alkali metal phosphides in which the activity increases sequentially and significantly as Group One is descended with Cs(18‐crown‐6)PPh2 (1Cs) performing best.
Krämer F, Downie TMH, Mulvey RE.
europepmc   +3 more sources

Photo-Mediated Silacyclization by Wavelength-Dependent Selective C─F or C─H Functionalization. [PDF]

Angew Chem Int Ed Engl
A wavelength‐dependent, transition‐metal‐free cascade silacyclization of allylbenzene derivatives with dihydrosilanes is developed to enable the efficient construction of six‐membered benzosilacycles. Selective C–F functionalization is achieved under 456 nm LED irradiation, while irradiation at 335 nm promotes acceptorless dehydrosilacyclization via C ...
Wang G, Yuan Y, Wang C, Ren B, Ang HT, Zhou R, Wu J.   +6 more
europepmc   +3 more sources

Iron-Catalyzed Tunable Double Bond Migration and Geometrical Isomerization in Olefins via a Spin-Accelerated Alkyl Mechanism. [PDF]

Angew Chem Int Ed Engl
A readily accessible, well‐defined iron(II) catalyst that demonstrates high efficiency and versatility in positional and geometrical alkene isomerization is presented. A comprehensive mechanistic study suggests an alkyl mechanism via an isolable iron hydride species and indicates the stereo‐ and rate‐determining β‐hydride elimination step exhibits a ...
Obeid AH, Herrero C, Guillot R, Hannedouche J.   +3 more
europepmc   +3 more sources

Heavyweight Champion: Caesium Diorganophosphides Outperform Lighter Congeners in the Catalytic Hydrophosphination of Alkenes and Alkynes. [PDF]

Angew Chem Int Ed Engl
The heavier, the better! We report that the caesium congener is the most active and versatile catalyst amongst a full group set of well‐defined crown ether supported alkali metal diphenyl phosphides for catalytic hydrophosphination of various substrates and phosphines including aryl and alkyl phosphines.
Krämer F, Crabbe MH, Fernández I, Mulvey RE.   +3 more
europepmc   +3 more sources

Self-Thickening Materials Derived from Phenylpropanoid Ene Reactions. [PDF]

Molecules
In this work, we report the observation of uncatalyzed ene reactions between several phenylpropanoid compounds and diethyl azodicarboxylate (DEAD). For allylbenzene, the reaction produces the ene product at molar ratios of up to 1:2 of allylbenzene to ...
Biswas A, Cheng HN, Chisholm B, Beni R, Liu Z, Vermillion K, Appell M, Forson K, El Seoud O, Alves CR, Furtado RF.   +10 more
europepmc   +3 more sources

Markovnikov wacker-tsuji oxidation of allyl(hetero)arenes and application in a one-pot photo-metal-biocatalytic approach to enantioenriched amines and alcohols [PDF]

, 2021
Financial support from the Spanish Ministry of Economy and Competitiveness (MEC, Project CTQ2016-75752-R), the Spanish Ministry of Science and Innovation (MCI, PID2019- 109253RB-I00) and the Asturian regional government (FC-GRUPIN-IDI/2018/000181) are ...
Albarrán Velo, Jesús, Gotor Fernández, Vicente, Lavandera García, Iván   +2 more
core   +4 more sources

Catalytic difunctionalization of unactivated alkenes with unreactive hexamethyldisilane through regeneration of silylium ions [PDF]

, 2019
A metal‐free, intermolecular syn‐addition of hexamethyldisilane across simple alkenes is reported. The catalytic cycle is initiated and propagated by the transfer of a methyl group from the disilane to a silylium‐ion‐like intermediate, corresponding to ...
Grimme, Stefan, Irran, Elisabeth, Klare, Hendrik F. T., Oestreich, Martin, Qu, Zheng-Wang, Roy, Avijit, Wu, Qian   +6 more
core   +1 more source

Metal-assisted reactions. Part 25. Heterogeneous and homogeneous catalytic transfer hydrogenolysis of allyloxytetrazoles to yield alkenes or alkanes [PDF]

, 1996
Transfer hydrogenolysis of 5-allyloxy- 1-phenyltetrazoles using either a heterogeneous or a homogeneous palladium catalyst and a hydrogen donor leads to cleavage of the allyloxy C-O bond to yield an alkane or an alkene and 1-phenyltetrazolone, depending ...
Cristiano, Maria Lurdes Santos, Johnstone, Robert A. W., Price, Peter J.   +2 more
core   +1 more source

ANTIOXIDANT AND TOXICITY ACTIVITY IN VITRO OF TWELVE SAFROLE DERIVATIVES [PDF]

, 2014
Indexación: Web of Science; Scielo.The aim of this study was to determine the influence of substituents in aromatic ring and the side chain of safrole on the antioxidant capacity and toxicity of twelve synthetic derivatives of safrole (S1-S12).
CARRASCO, HÉCTOR, ESPINOZA, LUIS, HIDALGO, MARÍA ELIANA, MADRID, ALEJANDRO, PAVÉZ, CATALINA   +4 more
core   +1 more source