Results 21 to 30 of about 11,057 (221)

Ring-closing metathesis of prochiral oxaenediynes to racemic 4-alkenyl-2-alkynyl-3,6-dihydro-2H-pyrans

Beilstein Journal of Organic Chemistry, 2020
The prochiral 4-(allyloxy)hepta-1,6-diynes, optionally modified in the positions 1 and 7 with an alkyl or ester group, undergo a chemoselective ring-closing enyne metathesis yielding racemic 4-alkenyl-2-alkynyl-3,6-dihydro-2H-pyrans.
Viola Kolaříková, Markéta Rybáčková, Martin Svoboda, Jaroslav Kvíčala   +3 more
doaj   +1 more source

The cross-metathesis of methyl oleate with cis-2-butene-1,4-diyl diacetate and the influence of protecting groups

Beilstein Journal of Organic Chemistry, 2011
Background: α,ω-Difunctional substrates are useful intermediates for polymer synthesis. An attractive, sustainable and selective (but as yet unused) method in the chemical industry is the oleochemical cross-metathesis with preferably symmetric ...
Arno Behr, Jessica Pérez Gomes
doaj   +1 more source

Olefin metathesis catalysts embedded in β-barrel proteins: creating artificial metalloproteins for olefin metathesis

Beilstein Journal of Organic Chemistry, 2018
This review summarizes the recent progress of Grubbs–Hoveyda (GH) type olefin metathesis catalysts incorporated into the robust fold of β-barrel proteins.
Daniel F. Sauer, Johannes Schiffels, Takashi Hayashi, Ulrich Schwaneberg, Jun Okuda   +4 more
doaj   +1 more source

The Effects of Social Variables of Age, Education and Gender on Metathesis Based on Variationist Sociolinguistics: A Case Study ‘Chokla’ in Hawrami Kurdish

پژوهشنامه ادبیات کردی, 2023
This research report presents a quantitative investigation into the impact of social variables including age, education and gender on a specific phonological variation (Metathesis in word [tʃoklæ]) in the Hawrami language, specifically the Paveh dialect.
Nadia Safiee, Ebrahim Badakhshan, Masoud Dehghan   +2 more
doaj   +1 more source

Synthesis of skeletally diverse alkaloid-like molecules: exploitation of metathesis substrates assembled from triplets of building blocks

Beilstein Journal of Organic Chemistry, 2013
A range of metathesis substrates was assembled from triplets of unsaturated building blocks. The approach involved the iterative attachment of a propagating and a terminating building block to a fluorous-tagged initiating building block.
Sushil K. Maurya, Mark Dow, Stuart Warriner, Adam Nelson   +3 more
doaj   +1 more source

Dimethyl 4,5-dichlorophthalate

IUCrData, 2021
While endeavoring to synthesize new chlorinated ligands for ruthenium-based metathesis catalysts, the title compound dimethyl 4,5-dichlorophthalate, C10H8Cl2O4, was prepared from commercially available 4,5-dichlorophthalic acid in ∼77% yield.
Daniel D. Hickstein, Eric W. Reinheimer, Adam R. Johnson, Daniel J. O'Leary   +3 more
doaj   +1 more source

Chemoselective Sequential Polymerization: An Approach Toward Mixed Plastic Waste Recycling

Advanced Functional Materials, EarlyView.
Inspired by biological protein metabolism, this study demonstrates the closed‐loop recycling of mixed synthetic polymers via ring‐closing depolymerization followed by a chemoselective sequential polymerizations process. The approach recovers pure polymers from mixed feedstocks, even in multilayer formats, highlighting a promising strategy to overcome a
Gadi Slor, Youwei Ma, Hyunwoo Park, Tae‐Lim Choi, Damien Guironnet, Francesco Stellacci   +5 more
wiley   +1 more source

Hoveyda–Grubbs catalysts with an N→Ru coordinate bond in a six-membered ring. Synthesis of stable, industrially scalable, highly efficient ruthenium metathesis catalysts and 2-vinylbenzylamine ligands as their precursors

Beilstein Journal of Organic Chemistry, 2019
A novel and efficient approach to the synthesis of 2-vinylbenzylamines is reported. This involves obtaining 2-vinylbenzylamine ligands from tetrahydroisoquinoline by alkylation and reduction followed by the Hofmann cleavage.
Kirill B. Polyanskii, Kseniia A. Alekseeva, Pavel V. Raspertov, Pavel A. Kumandin, Eugeniya V. Nikitina, Atash V. Gurbanov, Fedor I. Zubkov   +6 more
doaj   +1 more source

SI‐bioATRP in Mesoporous Silica for Size‐Exclusion Driven Local Polymer Placement

Advanced Functional Materials, EarlyView.
An enzyme‐catalyzed surface‐initiated atom transfer radical polymerization (SI‐bioATRP) of an anionic monomer within mesoporous silica particles, using hemoglobin as a catalyst, allows for controlling the location of the formed polymer via size‐exclusion effects between the nanopores and the biomacromolecules, thereby opening routes to functional ...
Oleksandr Wondra, Eleonora Ornati, Robert Lehn, Joanna J. Mikolei, Hergen Breitzke, Raheleh Pardehkhorram, Gerd Buntkowsky, Nico Bruns, Annette Andrieu‐Brunsen   +8 more
wiley   +1 more source

Synergistic approach to polycycles through Suzuki–Miyaura cross coupling and metathesis as key steps

Beilstein Journal of Organic Chemistry, 2018
This account provides an overview of recent work, including our own contribution dealing with Suzuki–Miyaura cross coupling in combination with metathesis (or vice-versa). Several cyclophanes, polycycles, macrocycles, spirocycles, stilbenes, biaryls, and
Sambasivarao Kotha, Milind Meshram, Chandravathi Chakkapalli   +2 more
doaj   +1 more source