Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Ulrich, von Roman"'
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:
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
Publikováno v:
Synthesis. 1993:985-992
The conversion of ketones into alkenyl bromides is accomplished in one or two steps by 2,2,2-tribromo-2,2-dihydro-1,3,2-benzodioxaphosphole or by the dibromomethyl methyl ether prepared therefrom. Investigations of the scope and limitations provide s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8f5d067a3ffbeb6f762bb1acce10453
https://doi.org/10.1055/s-1993-25986
https://doi.org/10.1055/s-1993-25986
Publikováno v:
Journal f�r Praktische Chemie/Chemiker-Zeitung. 336:260-262
Three aldehydes (4a–c) are transformed into 1,1-dibromides (6a–c) by 2,2,2-tribromo-2,2-dihydro-1,3,2-benzodioxaphosphole (2). This reagent (2) is also very active in the cleavage of ethers; its reactions may show some features of carbonium as we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f15bb8d0316377d0ddf568874a1158a
https://doi.org/10.1002/prac.19943360313
https://doi.org/10.1002/prac.19943360313