Zobrazeno 1 - 10
of 62
pro vyhledávání: '"David S. Stephenson"'
Publikováno v:
Beilstein Journal of Organic Chemistry, Vol 12, Iss 1, Pp 1178-1184 (2016)
Do not rely on the widely accepted rule that vicinal, sp3-positioned protons in cyclopentene moieties should always have more positive 3J NMR coupling constants for the cis than for the trans arrangement: Unrecognized exceptions might misguide one to
Externí odkaz:
https://doaj.org/article/f701ebd142ce47699b6610483c043323
Publikováno v:
Chemistry (Weinheim an der Bergstrasse, Germany). 28(55)
Kinetics and mechanism of the reactions of methyl diazoacetate, dimethyl diazomalonate, 4-nitrophenyldiazomethane, and diphenyldiazomethane with sulfonium ylides and enamines were investigated by UV-Vis and NMR spectroscopy. Ordinary alkenes undergo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d945400842adf78639a97a41c0d0662
https://pubmed.ncbi.nlm.nih.gov/35758555
https://pubmed.ncbi.nlm.nih.gov/35758555
Publikováno v:
Angewandte Chemie International Edition. 61
Methyl diazoacetate reacts with 1-(N-pyrrolidino)cycloalkenes to give products of 1,3-dipolar cycloadditions and azo couplings. The kinetics and mechanisms of these reactions were investigated by NMR spectroscopy and DFT calculations. Orthogonal π-s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e3769bf3a6a3ca4578560d0a883a071
https://doi.org/10.1002/anie.202117047
https://doi.org/10.1002/anie.202117047
Publikováno v:
Angewandte Chemie. 134
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ff374b6459381e87cef57bc0338293a
https://doi.org/10.1002/ange.202117047
https://doi.org/10.1002/ange.202117047
Publikováno v:
The Journal of Organic Chemistry. 83:14314-14322
Allylindium halides are valuable allylating reagents, which can even be applied in aqueous solutions. Previous 1H NMR spectroscopic investigations suggested that these reagents are stable for several hours in D2O, whereas ESI-mass spectrometric exper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71ab060e3a611de609f4af3aea8c5285
https://doi.org/10.1021/acs.joc.8b01971
https://doi.org/10.1021/acs.joc.8b01971
Publikováno v:
Chemistry - A European Journal. 23:7422-7427
The nucleophilicity and Lewis basicity of sterically hindered phosphines, widely used in catalysis and in frustrated Lewis pair (FLP) chemistry, have been quantified by determining the rates and equilibrium constants of their associations with refere
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::82407035fd2b6501b297e6f38fd404d4
https://doi.org/10.1002/chem.201701080
https://doi.org/10.1002/chem.201701080
Publikováno v:
Beilstein Journal of Organic Chemistry, Vol 12, Iss 1, Pp 1178-1184 (2016)
Beilstein Journal of Organic Chemistry
Beilstein Journal of Organic Chemistry
Do not rely on the widely accepted rule that vicinal, sp3-positioned protons in cyclopentene moieties should always have more positive 3J NMR coupling constants for the cis than for the trans arrangement: Unrecognized exceptions might misguide one to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2eadc749fe3f2ea8e7b8343906375f04
https://doaj.org/article/f701ebd142ce47699b6610483c043323
https://doaj.org/article/f701ebd142ce47699b6610483c043323
Autor:
Hendrik Zipse, Josef Heinrich Wender, Max C. Holthausen, David S. Stephenson, Pascal Patschinski, Cong Zhang, Robin Panisch
Publikováno v:
Phys. Chem. Chem. Phys.. 16:16642-16650
Aiming at the identification of an efficient computational protocol for the accurate NMR assessment of organosilanes in low-polarity organic solvents, (29)Si NMR chemical shifts of a selected set of such species relevant in organic synthesis have bee
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2932cc49c6caa6c72ee7a313dead1bce
https://doi.org/10.1039/c4cp01736f
https://doi.org/10.1039/c4cp01736f
Autor:
David S. Stephenson, Ulrike Lischke, Thomas Carell, Tim H. Gehrke, Sabine Schneider, Hendrik Zipse, Karola L. Gasteiger, Simone Arnold, Heiko Müller
Publikováno v:
Nature Chemical Biology. 9:455-461
8-Oxopurines (8-oxodG and 8-oxodA) and formamidopyrimidines (FaPydG and FaPydA) are major oxidative DNA lesions involved in cancer development and aging. Their mutagenicity is believed to result from a conformational shift of the N9-C1' glycosidic bo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed36330a09c9206cd36c34cee067fca0
https://doi.org/10.1038/nchembio.1254
https://doi.org/10.1038/nchembio.1254
Publikováno v:
ChemCatChem. 4:993-999
The nucleophile-specific parameters N and sN, as defined by log k20 °C=sN(N+E) have been derived for the guanidines 1 a–h from the second-order rate constants of their reactions with diarylcarbenium tetrafluoroborates in CH2Cl2 at 20 °C. The appl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b1466f90f17a402be18d7c4d8ba48e17
https://doi.org/10.1002/cctc.201200143
https://doi.org/10.1002/cctc.201200143