Results 31 to 40 of about 26,308 (247)

Merging Biocatalysis and Chemocatalysis in Flow: State‐of‐the‐Art and Future Directions for Sustainable Synthesis

Angewandte Chemie, EarlyView.
This review highlights recent advances in integrating biocatalysis and chemocatalysis in continuous flow to create streamlined, sustainable processes. It examines chemo‐enzymatic cascades combining at least one enzymatic and one chemical step, discusses challenges such as enzyme immobilization, leaching, and reactor clogging, and presents solutions ...
Petros Siasiaridis, Matteo Damian, Francesco G. Mutti   +2 more
wiley   +2 more sources

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

A reação de metátese de olefinas: reorganização e ciclização de compostos orgânicos The olefin metathesis reaction: reorganization and ciclization of organic compounds

Química Nova, 2005
The olefin metathesis reaction allows the exchange of complex alkyl units between two olefins, with the formation of a new olefinic link and a sub-product olefin usually ethylene.
Daniel Frederico, Ursula Brocksom, Timothy John Brocksom   +2 more
doaj   +1 more source

Monotelechelic Poly(oxa)norbornenes by Ring-Opening Metathesis Polymerization Using Direct End-Capping and Cross-Metathesis [PDF]

, 2010
Two different methodologies for the synthesis of monotelechelic poly(oxa)norbornenes prepared by living ring-opening metathesis polymerization (ROMP) are presented.
Grubbs, Robert H., Matson, John B.
core   +2 more sources

The allylic chalcogen effect in olefin metathesis

Beilstein Journal of Organic Chemistry, 2010
Olefin metathesis has emerged as a powerful tool in organic synthesis. The activating effect of an allylic hydroxy group in metathesis has been known for more than 10 years, and many organic chemists have taken advantage of this positive influence for ...
Yuya A. Lin, Benjamin G. Davis
doaj   +1 more source

Synthesis of Fluorine-18 Functionalized Nanoparticles for use as in vivo Molecular Imaging Agents [PDF]

, 2008
Nanoparticles containing fluorine-18 were prepared from block copolymers made by ring opening metathesis polymerization (ROMP). Using the fast initiating ruthenium metathesis catalyst (H_2IMes)(pyr)_2(Cl)_2Ru=CHPh, low polydispersity amphiphilic block ...
, X. K., A. Guo, A. M. Morawski, A. M. Smith, C. C. Lee, C. Slugovc, C. W. Bielawski, C. W. Bielawski, D. F. Baban, D. W. Bartlett, E. D. Pressly, E. M. Jagoda, E. M. Rohren, F. Henselwood, F. M. Menger, G. J. Liu, H. A. Nabi, H. D. Maynard, H. Kobayashi, H. Maeda, H. Maeda, H. R. Ihre, I. Brigger, J. A. Love, J. B. Matson, J. Heidel, J. R. Heath, K. D. Camm, K. Fukukawa, L. Cai, L. H. Reddy, M. F. Ilker, M. Ferrari, M. L. Adams, M. L. Schipper, M. Licciardi, M. Rawat, N. K. Jain, N. Malik, R. Gref, R. Sinha, S. K. Hobbs, S. M. Lee, S. M. Moghimi, T. L. Choi, V. Bagalkot, V. P. Tochilin, V. P. Torchilin, V. P. Torchilin, V. P. Torchilin, W. J. M. Mulder, W. S. Seo, X. Michalet, Y. Matsumura, Z. Yang   +54 more
core   +3 more sources

The Far Side of Carboranes: Anticancer Active Monocations and Ambiently Stable Dications

Angewandte Chemie, EarlyView.
This work describes the synthesis of bench‐stable dicationic carboranes. Their enhanced electrophilicity is documented by opening the clusters with weak nucleophiles or dihydrogen. The surprising stability of positively charged carboranes in water enabled a study of their in vitro antiproliferative activity, which surpassed the effects of doxorubicin ...
Vlastimil Němec, Josef Holub, Maksim A. Samsonov, Zdeňka Růžičková, Josef Cvačka, Ján Vančo, Zdeněk Trávníček, Jan Belza, Zdeněk Dvořák, Jan Vrána, Aleš Růžička   +10 more
wiley   +2 more sources

Beyond catalyst deactivation: cross-metathesis involving olefins containing N-heteroaromatics

Beilstein Journal of Organic Chemistry, 2015
Alkenes containing N-heteroaromatics are known to be poor partners in cross-metathesis reactions, probably due to catalyst deactivation caused by the presence of a nitrogen atom.
Kevin Lafaye, Cyril Bosset, Lionel Nicolas, Amandine Guérinot, Janine Cossy   +4 more
doaj   +1 more source

Template-Directed Olefin Cross Metathesis

Organic Letters, 2005
[reaction: see text] A template containing two secondary dialkylammonium ion recognition sites for encirclement by olefin-bearing dibenzo[24]crown-8 derivatives has been used to promote olefin cross metatheses with ruthenium-alkylidene catalysts.
Stuart J, Cantrill, Robert H, Grubbs, Daniela, Lanari, Ken C-F, Leung, Alshakim, Nelson, Katherine G, Poulin-Kerstien, Sebastian P, Smidt, J Fraser, Stoddart, David A, Tirrell   +8 more
openaire   +4 more sources

Highly Active Water-Soluble Olefin Metathesis Catalyst [PDF]

, 2006
A novel water-soluble ruthenium olefin metathesis catalyst supported by a poly(ethylene glycol) conjugated saturated 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene ligand is reported.
Grubbs, Robert H., Hong, Soon Hyeok
core   +1 more source