Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Celin Richter"'
Autor:
Martin Quick, Olivia Krohn, S. A. Kovalenko, Svetlana M. Sudarkova, Celin Richter, Ilya N. Ioffe
Publikováno v:
The Journal of chemical physics. 152(22)
The photoisomerization path and dynamics of trans-trans (ttD), cis-trans (ctD), and cis-cis (ccD) 1,4-diphenyl-1,3-butadiene (DPB) in solution are studied with broadband transient absorption (TA) spectroscopy and quantum chemical calculations. For tt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::48076e5b7a6c48db8597853cb39370de
https://pubmed.ncbi.nlm.nih.gov/32534550
https://pubmed.ncbi.nlm.nih.gov/32534550
Autor:
Alexander A. Granovsky, Celin Richter, Rainer Mahrwald, Ilya N. Ioffe, Martin Quick, Michael T. Quick, A. L. Dobryakov, Falko Berndt, Nikolaus P. Ernsting, Sergey A. Kovalenko
Publikováno v:
Journal of the American Chemical Society. 139:15265-15274
Spontaneous polarization of a nonpolar molecule upon photoexcitation (the sudden polarization effect) earlier discussed for 90°-twisted alkenes is observed and calculated for planar ring-fluorinated stilbenes, trans-2,3,5,6,2′,3′,5′,6′-octof
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71bccaf4e70abf5ca823a7de05fb65e0
https://doi.org/10.1021/jacs.7b09611
https://doi.org/10.1021/jacs.7b09611
Autor:
Martin Quick, Celin Richter, Mario Gerecke, Sergey A. Kovalenko, Ilya N. Ioffe, Nikolaus P. Ernsting, Rainer Mahrwald
Publikováno v:
The Journal of Physical Chemistry B. 121:9631-9638
We monitor the time-dependent Stokes shift (TDSS) of fluorescence from the zwitterionic probe N-methyl-6-oxyquinolinium betaine in water. A spectral relaxation time τsolv = 0.57 ps (at 20.5 °C) is attributed to a solvation process involving water i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a9f684ca459a19866979a9d775e81679
https://doi.org/10.1021/acs.jpcb.7b05031
https://doi.org/10.1021/acs.jpcb.7b05031
Publikováno v:
European Journal of Organic Chemistry. 2016:5309-5320
A highly stereoselective de-Bruyn–Ekenstein rearrangement/aldol condensation/intramolecular oxa-Michael cascade reaction of unprotected ketoses with ketones was elaborated. By the utilization of this new and operationally simple methodology an acce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68032ddc45fcb137f0eb009db1f36a6a
https://doi.org/10.1002/ejoc.201601058
https://doi.org/10.1002/ejoc.201601058
Publikováno v:
ACS Catalysis. 6:5549-5552
An amine-catalyzed cascade reaction of unprotected carbohydrates with 1.3-diketones was elaborated. This cascade is based on a Knoevenagel reaction/intramolecular ketalization/retro-aldol reaction. By application of this operationally simple protocol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a0262930222ce4c0d58886c0493e5a9
https://doi.org/10.1021/acscatal.6b01699
https://doi.org/10.1021/acscatal.6b01699
Publikováno v:
Organic Letters. 18:2950-2953
An operationally simple protocol is reported to generate an α-hydroxyacyl anion by the decarboxylation of dihydroxyfumaric acid. To date, the "missing" utilization of the hydroxyacyl anion in highly chemo- and stereoselective cascade reactions enabl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66a27b14a81ed6728abb4e0361066e41
https://doi.org/10.1021/acs.orglett.6b01287
https://doi.org/10.1021/acs.orglett.6b01287
Publikováno v:
Synthesis. 48:1217-1225
High selectivity is observed during a Friedel–Crafts acylation/demethylation cascade. In contrast to this cascade, oxygen-containing acylating reagents do not undergo the demethylation step. By the methodology elaborated here, an access is provided
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::082337aa83a44b033840c939bc8c2664
https://doi.org/10.1055/s-0035-1561370
https://doi.org/10.1055/s-0035-1561370
Autor:
Jon Hughes, Nikolaus P. Ernsting, Celin Richter, Pierre Volz, Bernhard Dick, Rainer Mahrwald, Constantin Schneider, Ulrike Alexiev, Martin Quick
Publikováno v:
Physical Chemistry Chemical Physics. 17:30590-30597
Although seminaphtorhodafluor (SNARF) dyes are already widely used to measure pH in cells and at biofilms, their synthesis has low yield and results in an unspecific position of a carboxy-group. The separation of 5′- and 6′-carboxy-SNARF reveals
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::413fbd309b2e0b46dc8a7b6ddcb8d104
https://doi.org/10.1039/c5cp05454k
https://doi.org/10.1039/c5cp05454k
Publikováno v:
RSC Advances. 5:45571-45574
An amine-catalyzed cascade reaction of ketoses with 1,3-dicarbonyl compounds is described. Several highly chemo- as well as stereoselective reactions are operating in this novel cascade. The operationally simple protocol allows stereoselective access
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15bf2e77354c76e14113337b935c43d4
https://doi.org/10.1039/c5ra08757k
https://doi.org/10.1039/c5ra08757k
Autor:
Rainer Mahrwald, C. Knie, Celin Richter, Ilya N. Ioffe, Martin Quick, S. A. Kovalenko, A. L. Dobryakov, Alexander A. Granovsky, Nikolaus P. Ernsting
Publikováno v:
The Journal of chemical physics. 146(4)
The photoisomerization of 1,1′-difluorostilbene, following S0→S1 optical excitation in solution, was studied with femtosecond broadband transient absorption and stimulated Raman spectroscopy, and by quantum-chemical calculations. In n-hexane, tra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ec0f47b382b00994d06579c6783a16f
https://pubmed.ncbi.nlm.nih.gov/28147515
https://pubmed.ncbi.nlm.nih.gov/28147515