Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Johannes Ammer"'
Autor:
Armin R. Ofial, Tobias A. Nigst, Mahiuddin Baidya, Biplab Maji, Thomas Singer, Herbert Mayr, Johannes Ammer
Publikováno v:
Journal of the American Chemical Society. 137:2580-2599
Equilibria for the reactions of benzhydryl cations (Ar2CH(+)) with phosphines, tert-amines, pyridines, and related Lewis bases were determined photometrically in CH2Cl2 and CH3CN solution at 20 °C. The measured equilibrium constants can be expressed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ee173ae2ae2fcbb6afcd74ef62c0d22
https://doi.org/10.1021/ja511639b
https://doi.org/10.1021/ja511639b
Publikováno v:
Journal of the American Chemical Society. 139(4)
The kinetics of the reactions of the vinyl cations 2 [Ph2C═C+–(4-MeO–C6H4)] and 3 [Me2C═C+–(4-MeO–C6H4)] (generated by laser flash photolysis) with diverse nucleophiles (e.g., pyrroles, halide ions, and solvents containing variable amount
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd86611da97d9511ceaee03a63a1b0c0
https://pubmed.ncbi.nlm.nih.gov/28040896
https://pubmed.ncbi.nlm.nih.gov/28040896
Autor:
Feng An, Shyeni Paul, Johannes Ammer, Peter Mayer, Herbert Mayr, Armin R. Ofial, Sami Lakhdar
Publikováno v:
Asian Journal of Organic Chemistry. 3:550-555
A series of α,β-unsaturated iminium ions derived from substituted cinnamaldehydes and C2- and C5-substituted chiral imidazolidin-4-ones were isolated and characterized in solution and in the solid state. The kinetics of the reactions of the iminium
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c4534dbd1adffddbafa6b15af080677
https://doi.org/10.1002/ajoc.201402009
https://doi.org/10.1002/ajoc.201402009
Autor:
Konstantin Karaghiosoff, Johannes Ammer, Sebastian Thallmair, Regina de Vivie-Riedle, Christoph Nolte, Herbert Mayr, Peter Mayer
Publikováno v:
Chemistry - A European Journal. 19:14612-14630
The (1) H NMR chemical shifts of the C(α)H protons of arylmethyl triphenylphosphonium ions in CD2 Cl2 solution strongly depend on the counteranions X(-) . The values for the benzhydryl derivatives Ph2 CHPPh3 (+) X(-) , for example, range from
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5678b39d65221fcef0faa72f05c793b8
https://doi.org/10.1002/chem.201204561
https://doi.org/10.1002/chem.201204561
Autor:
Herbert Mayr, Johannes Ammer
Publikováno v:
Journal of Physical Organic Chemistry. 26:956-969
The generation of carbocations by laser flash photolysis of suitable precursors provides information about their reactivities toward nucleophiles on the nanosecond and microsecond time scale that cannot be obtained by conventional methods. We discuss
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9587963e2ea1e7533850df499374eb1f
https://doi.org/10.1002/poc.3132
https://doi.org/10.1002/poc.3132
Autor:
Armin R. Ofial, Peter Mayer, Biplab Maji, Mahiuddin Baidya, Shinjiro Kobayashi, Johannes Ammer, Herbert Mayr
Publikováno v:
European Journal of Organic Chemistry. 2013:3369-3377
The nucleophilicity parameters N and sN, as defined by the linear free-energy equation log k(20 °C) = sN(N + E), of the 2-imidazolines 1a–d and the related N-heterocyclic compounds 2–5 have been determined by studying the rates of their reaction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5917f7420eec17e47b46514b9943d2ab
https://doi.org/10.1002/ejoc.201300213
https://doi.org/10.1002/ejoc.201300213
Autor:
Johannes Ammer, Herbert Mayr
Publikováno v:
Journal of Physical Organic Chemistry. 26:59-63
First-order rate constants k1 for the trapping of various donor- and acceptor-substituted benzhydrylium ions in mixtures of 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) and water ranging from 50 to 99% HFIP (w/w) were determined by laser flash photolytic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e009b3d0b581d4da6be941d5c1ddca5
https://doi.org/10.1002/poc.3064
https://doi.org/10.1002/poc.3064
Publikováno v:
The Journal of Physical Chemistry A. 116:8494-8499
Laser flash irradiation of substituted N-benzhydryl pyridinium salts yields benzhydryl cations (diarylcarbenium ions) and/or benzhydryl radicals (diarylmethyl radicals). The use of 3,4,5-triamino-substituted pyridines as photoleaving groups allowed u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93e780f2db08b643bb204fa3a16525f8
https://doi.org/10.1021/jp3049247
https://doi.org/10.1021/jp3049247
Publikováno v:
The Journal of Organic Chemistry. 77:3325-3335
A series of p-substituted benzhydryl fluorides (diarylfluoromethanes) were prepared and subjected to solvolysis reactions, which were followed conductometrically. The observed first-order rate constants k(1)(25 °C) were found to follow the correlati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49fafc6731bf8b2a8a88deb2700ac57e
https://doi.org/10.1021/jo300141z
https://doi.org/10.1021/jo300141z
Publikováno v:
Angewandte Chemie. 124:1381-1385
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d4317567d979bea877b3d22feb3b77f
https://doi.org/10.1002/ange.201107315
https://doi.org/10.1002/ange.201107315