Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Torkil Holm"'
Publikováno v:
Tetrahedron. 70:4942-4946
The ring-opening of cyclic ethers with concomitant C–C bond formation was studied with a number of Grignard reagents. The transformation was performed in a sealed vial by heating to ∼160 °C in an aluminum block or at 180 °C in a microwave oven.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6eacf15c2723ab1a8007ca23aae7e00b
https://doi.org/10.1016/j.tet.2014.05.026
https://doi.org/10.1016/j.tet.2014.05.026
Publikováno v:
Tetrahedron. 70:1478-1483
The Grignard addition reaction is known to be a reversible process with allylic reagents, but so far the reversibility has not been demonstrated with other alkylmagnesium halides. By using crossover experiments it has been established that the benzyl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41ba113e0a33d5ac7afa6c6c6a08e755
https://doi.org/10.1016/j.tet.2013.12.070
https://doi.org/10.1016/j.tet.2013.12.070
Publikováno v:
ChemInform. 45
Good yields of the product alcohols are obtained with allyl- and benzylmagnesium halides (II) and (V) when the ether is THF (I) or 3,3-dimethyloxetane (IV).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::27df75394870ecd042359dd464b4c711
https://doi.org/10.1002/chin.201451032
https://doi.org/10.1002/chin.201451032
Autor:
Torkil Holm
Publikováno v:
The Journal of Organic Chemistry. 65:1188-1192
Competition kinetics are useful for estimation of the reactivities of Grignard reagents if the reaction rates do not differ widely and if exact rates are not needed. If the rate of mixing is slower than the rate of reaction, the ratios between the ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bad873ec4c599267779333158947b03f
https://doi.org/10.1021/jo991777h
https://doi.org/10.1021/jo991777h
Autor:
Torkil Holm
Publikováno v:
Journal of Chromatography A. 842:221-227
The development of flame ionization detection took place on an empirical basis without a clear understanding of the mechanism. The study of flames by mass spectrometry showed that the all-important ion was the formylium ion CHO+. The pre-combustion d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f77387184700a2455d00356dbf03fb61
https://doi.org/10.1016/s0021-9673(98)00706-7
https://doi.org/10.1016/s0021-9673(98)00706-7
Autor:
Torkil Holm
Publikováno v:
Journal of the American Chemical Society. 121:515-518
α-Deuterium (α-D) kinetic isotope effects (KIEs) have been determined for the reaction of methyl iodide with a series of reducing agents. Reagents which transfer hydride ion in an SN2 reaction show small inverse or small normal KIEs. Reagents which
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db1908ef540c5e6e9c2e2bd0c8aa5d44
https://doi.org/10.1021/ja981968m
https://doi.org/10.1021/ja981968m
Autor:
Torkil Holm
Publikováno v:
Journal of Chromatography A. 782:81-86
The relative molar flame ionization detection (FID) response (RMR) for a hydrocarbon does not change when deuterium is substituted for hydrogen. The exception is methane for which an inverse deuterium isotope effect of 3.5% is observed for tetradeute
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6d7267622d2354f57aeb99a52ed3645
https://doi.org/10.1016/s0021-9673(97)00483-4
https://doi.org/10.1016/s0021-9673(97)00483-4
Autor:
Torkil Holm, Ingolf Crossland
Publikováno v:
Journal of Labelled Compounds and Radiopharmaceuticals. 38:803-808
26,26,26,27,27,27 Hexadeuterio cholesterol has been prepared in 9 steps from pregnenolone and hexadeuterio acetone with an overall yield of 7 %.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74fa07bd906b71647077542a5e32fe66
https://doi.org/10.1002/(sici)1099-1344(199609)38:9<803::aid-jlcr892>3.0.co
https://doi.org/10.1002/(sici)1099-1344(199609)38:9<803::aid-jlcr892>3.0.co
Autor:
Jørgen Øgaard Madsen, Torkil Holm
Publikováno v:
Analytical Chemistry. 68:3607-3611
The precombustion degradation of organic compounds in the flame ionization detector has been studied (1) by heating the additives in hydrogen in a quartz capillary and analyzing the reaction products by GC and (2) by following the degradation of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a306fc5bdc6ce26200faa11867247b7
https://doi.org/10.1021/ac960556y
https://doi.org/10.1021/ac960556y
Autor:
Torkil Holm, Ingolf Crossland, Hans Toftlund, Jon Songstad, Markku Leskelä, Mika Polamo, Muhammed Nour Homsi, Frank K. H. Kuske, Monika Haugg, Nathalie Trabesinger-Rüf, Elmar G. Weinhold
Publikováno v:
Acta Chemica Scandinavica. 50:90-93
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab0fa03747b5f28b8855da594a9a949c
https://doi.org/10.3891/acta.chem.scand.50-0090
https://doi.org/10.3891/acta.chem.scand.50-0090