Zobrazeno 1 - 10
of 117
pro vyhledávání: '"Juho Helaja"'
Publikováno v:
Angewandte Chemie. International Edition; May 2006, Vol. 45 Issue: 21 p3538-3542, 5p
Publikováno v:
Lenarda, A, Wirtanen, T & Helaja, J 2023, ' Carbon Materials as Catalytic Tools for Oxidative Dehydrogenations and Couplings in Liquid Phase ', Synthesis, vol. 55, no. 1, pp. 45-61 . https://doi.org/10.1055/a-1931-0749
Carbocatalysis is a heterogeneous metal-free catalytic technique of high potential for current and future synthetic processes. Carbocatalysts entail heterogeneous materials based on sp2/sp3 interconnected carbons decorated with oxygen functional grou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b6a0f624aa0618fd463975b222ce297
https://doi.org/10.1055/a-1931-0749
https://doi.org/10.1055/a-1931-0749
Autor:
Stefan Taubert, Mikko Muuronen, Tao Hu, Dage Sundholm, Tom Wirtanen, David Sebastian Casadio, Anna Lenarda, Santeri Alfred Arttu Aikonen, Martin Nieger, Juho Helaja
Publikováno v:
Chemistry (Weinheim an Der Bergstrasse, Germany)
Mildly thermal air or HNO3 oxidized activated carbons catalyse oxidative dehydrogenative couplings of benzo[b]fused heteroaryl 2,2’‐dimers, e.g., 2‐(benzofuran‐2‐yl)‐1H‐indole, to chiral 3,3’‐coupled cyclooctatetraenes or carbazole
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::477f63f87dae22dfe7158d60765503ad
https://doi.org/10.1002/chem.202005433
https://doi.org/10.1002/chem.202005433
Publikováno v:
SSRN Electronic Journal.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6d298ca16e32f149da67009df960fe6
https://doi.org/10.2139/ssrn.4158176
https://doi.org/10.2139/ssrn.4158176
Publikováno v:
Organic Letters
Visible-light-excited 9,10-phenanthrenequinone (PQ*) was used as a photocatalyst for the synthesis of polysubstituted quinolines via the electrocyclization of 2-vinylarylimines. Up to quantitative yields of 2,4-disubstituted quinolines were received
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3e421b05d2092ea600b11f42f64606e
https://pubmed.ncbi.nlm.nih.gov/34928166
https://pubmed.ncbi.nlm.nih.gov/34928166
Autor:
Tanja Kallio, Fatemeh Davodi, Tom Wirtanen, Michele Melchionna, Mikko Muuronen, Juho Helaja, Marianna Kemell, Tao Hu, Santeri Alfred Arttu Aikonen
Publikováno v:
Chemistry – A European Journal. 25:12288-12293
HNO3-oxidized carbon nanotubes catalyze oxidative dehydrogenative (ODH) carbon-carbon bond formation between electron-rich (hetero)aryls with O-2 as a terminal oxidant. The recyclable carbocatalytic method provides a convenient and an operationally e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3fda05e54c3ef38f01c8fbd4ceda641
https://doi.org/10.1002/chem.201903054
https://doi.org/10.1002/chem.201903054
Publikováno v:
Organic Letters
A photoreductive protocol utilizing [Ru-(bpy)3]2+ photocatalyst, blue light LEDs, and ascorbic acid(AscH2) has been developed to reduce nitro N-heteroaryls to the corresponding anilines. Based on experimental and computational results and previous st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0b3971fc9c52fda435b69bd94224d30e
https://doi.org/10.1021/acs.orglett.9b01205
https://doi.org/10.1021/acs.orglett.9b01205
Autor:
Tom Wirtanen, Mikko K. Mäkelä, Juho Helaja, Martin Nieger, Tao Hu, Kiia Malinen, Anna Lenarda, Michele Melchionna, Juulia Talvitie, Evgeny Bulatov
Oxidized active carbon (oAC) catalyses the formation of polysubstituted quinolines from o-vinyl anilines and aldehydes. The reaction proceeds in a cascade manner through condensation, electrocyclization and dehydrogenation, and gives access to a wide
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9aca1181752dee2dadec062d02ec4403
https://hdl.handle.net/11368/2993731
https://hdl.handle.net/11368/2993731
Autor:
Lucília S. Ribeiro, Juho Helaja, Sami Hietala, Tao Hu, Tom Wirtanen, Lukas Enders, Manuel Fernando R. Pereira, David Sebastian Casadio, Santeri Alfred Arttu Aikonen, Anna Lenarda
A simple "reagent-free" thermal air treatment turns active carbon into a mildly oxidized material with increased quinoidic content that catalytically dehydrogenates saturated N-heterocycles to the corresponding aromatic compounds. Thermal decarboxyla
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e86636032f56777ca210b176b1f3881c
https://hdl.handle.net/10216/136378
https://hdl.handle.net/10216/136378
Autor:
Mikko Muuronen, Jordi Burés, Otto Seppänen, Santeri Alfred Arttu Aikonen, Carla Alamillo-Ferrer, Juho Helaja
Publikováno v:
Seppänen, O, Aikonen, S, Muuronen, M, Alamillo-ferrer, C, Burés, J & Helaja, J 2020, ' Dual H-bond activation of NHC–Au(I)–Cl complexes with amide functionalized side-arms assisted by H-bond donor substrates or acid additives ', Chemical Communications, vol. 56, no. 93, pp. 14697-14700 . https://doi.org/10.1039/D0CC05999D
Novel approach with amide-tethered H-bond donor NHC ligands enabled Au(I)-catalysis via H-bonding. The plain NHC-Au(I)-Cl complex catalysed conversions of terminal N-propynamides to oxazolines, and enyne cycloisomerization with an acid additive, in D
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6676c59d62304d00d9204d6f82ce5af6
https://pubmed.ncbi.nlm.nih.gov/33169740
https://pubmed.ncbi.nlm.nih.gov/33169740