Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Ernst Lattke"'
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:
Tetrahedron. 74:1621-1631
Common wisdom might anticipate that two methyl groups placed on a molecular migration route should act as an impediment. However, the “conducted tour” migration of Li+(THF)4 across the aryl ring (“π-route”) during the cis/trans stereoinversi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::468b97e95a8582a687560df49f95b85a
https://doi.org/10.1016/j.tet.2018.01.047
https://doi.org/10.1016/j.tet.2018.01.047
Autor:
Jakob Ruhdorfer, Claudia Behringer, Ernst Lattke, Ulrich von Roman, Petra Böhrer, Rudolf Knorr
Publikováno v:
Chemistry - A European Journal. 23:12861-12869
A "conducted tour" migration keeps a mobile client on a profitable route even though an occasional side-step may seem attractive. A stereochemical manifestation of such a migration had been suggested by Donald J. Cram (1964), and we present now a dif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6fed9b64ca62ee335bd2de33869a28f
https://doi.org/10.1002/chem.201702353
https://doi.org/10.1002/chem.201702353
Publikováno v:
Journal of Organometallic Chemistry. 824:61-72
The energetically stabilizing delocalization of negative electric charge from the Li-C(alpha) bond into the aryl pi system of alpha-arylvinyllithiums, Ar-C(Li)=CH2, is most efficient with an orthogonal relationship of the aryl ring plane and the C=C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3f327e3cefe0e945e26769c6b6ed776
https://doi.org/10.1016/j.jorganchem.2016.09.029
https://doi.org/10.1016/j.jorganchem.2016.09.029
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
Publikováno v:
The Journal of Organic Chemistry. 80:6313-6322
The title compound 4 is a trisolvated monomer 4&3THF in THF solution and dimerizes endothermically to form (4&THF)2 with a strongly positive (!) dimerization entropy in toluene as the solvent. In the absence of electron-pair donor ligands, 4 aggregat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dfcd24fd93897379d0290489c0f07f10
https://doi.org/10.1021/acs.joc.5b00762
https://doi.org/10.1021/acs.joc.5b00762
Autor:
Rudolf, Knorr, Claudia, Behringer, Jakob, Ruhdorfer, Ulrich, von Roman, Ernst, Lattke, Petra, Böhrer
Publikováno v:
Chemistry (Weinheim an der Bergstrasse, Germany). 23(52)
A "conducted tour" migration keeps a mobile client on a profitable route even though an occasional side-step may seem attractive. A stereochemical manifestation of such a migration had been suggested by Donald J. Cram (1964), and we present now a dif
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::2dd3d819c400d012d655fbf80af9d861
https://pubmed.ncbi.nlm.nih.gov/28682463
https://pubmed.ncbi.nlm.nih.gov/28682463
Autor:
Ernst Lattke, Claudia Behringer, Rudolf Knorr, Johann Mehlstäubl, Thomas Menke, Kathrin Ferchland
Publikováno v:
Organometallics. 32:4070-4081
The trans/cis stereoinversion of the trigonal carbanion centers C-α in a series of monomeric 2-(α-aryl-α-lithiomethylidene)-1,1,3,3-tetramethylindanes (known to be trisolvated at Li) is rapid on the NMR time scales (400 and 100.6 MHz) in THF solut
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cf3c7839688ec0965f0fb2ed7f49d661
https://doi.org/10.1021/om4000852
https://doi.org/10.1021/om4000852
Publikováno v:
Chemische Berichte. 130:585-592
Improved preparations of 2,6-dimethylstyrene (5) and its α-bromo derivative (10) are described. The Br/Li exchange reaction of 10 provides single crystals of the title compounds 11 or 12, which were characterized as disolvated dimers by X-ray analys
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0d31f16a6f01137754d69bcc87d72c9
https://doi.org/10.1002/cber.19971300509
https://doi.org/10.1002/cber.19971300509
Publikováno v:
Chemie Ingenieur Technik. 62:868-869
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fbe5c2f7de14b4867836d04684ef823b
https://doi.org/10.1002/cite.330621026
https://doi.org/10.1002/cite.330621026