Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Carl George Krespan"'
Autor:
Carl George Krespan, Stuart Raynolds, Paul S. Hees, Christopher H. Sotak, Hsu‐Nan ‐N Huang, M. H. Hung
Publikováno v:
Magnetic Resonance in Medicine. 29:188-195
A new perfluorocarbon, PTBD (perfluoro-2,2,2',2'-tetramethyl-4,4'-bis(1,3-dioxolane)), is described for use in 19F MR imaging and spectroscopy. Two-thirds of the molecular fluorine in PTBD resonates at a single frequency and can be imaged without the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8d844b4ae5729978c8041b0d3a9b246a
https://doi.org/10.1002/mrm.1910290206
https://doi.org/10.1002/mrm.1910290206
Autor:
Carl George Krespan
Publikováno v:
Journal of Fluorine Chemistry. 48:339-343
Difluoromaleic anhydride is obtained in good yield by reaction of either hexafluoro-2, 5-dihydrofuran or hexafluoro-2, 5-dihydrothiophene with sulfur trioxide. Hexafluoro-2, 5-dihydrothiophene is prepared from sulfur and commercially available hexafl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::177dcd7ddf5a5db4f3d72f29ab1268ba
https://doi.org/10.1016/s0022-1139(00)80218-3
https://doi.org/10.1016/s0022-1139(00)80218-3
Autor:
Carl George Krespan, V. N. M. Rao
Publikováno v:
Journal of Fluorine Chemistry. 58:182
F -Pentene-2 is obtained in 85–90% yield from a highly selective condensation of hexafluoropropene with tetrafluoroethene using aluminum halide catalysis. Vapor phase reduction affords 2H,3H- F -pentane (HFC 43-10 mee) in 99% yield, while liquid ph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2000904511aab1d0ec17abb30732b18
https://doi.org/10.1016/s0022-1139(00)80632-6
https://doi.org/10.1016/s0022-1139(00)80632-6
Autor:
Carl George Krespan
Publikováno v:
Journal of Fluorine Chemistry. 54:101
Fluoroalkylethylenes of types 1 and 2 are unresponsive to the usual reagents for epoxidation, but recent methods have made the epoxides and related halohydrins readily available. Use of the reagent X2/nSO3, which readily attacks the double bond of bo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bad2ef16b3f3ffe4464b11db2cd91d02
https://doi.org/10.1016/s0022-1139(00)83611-8
https://doi.org/10.1016/s0022-1139(00)83611-8
Autor:
Carl George Krespan
Publikováno v:
Journal of Fluorine Chemistry. 16:385-390
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bc7edcfa3d130149d0740399d504266
https://doi.org/10.1016/s0022-1139(00)82323-4
https://doi.org/10.1016/s0022-1139(00)82323-4
Autor:
Carl George Krespan
Publikováno v:
Journal of Fluorine Chemistry. 8:105-114
Three new fluoroketenes have been prepared having the acid fluoride, sulfonyl fluoride and ester functions, respectively, α to the ketene group. The synthesis and characterization of these ketenes is described, along with a convenient synthesis of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::219830baaf6fc326e5ad953645577216
https://doi.org/10.1016/s0022-1139(00)82688-3
https://doi.org/10.1016/s0022-1139(00)82688-3
Autor:
Carl George Krespan
Publikováno v:
Journal of Fluorine Chemistry. 2:173-180
Peroxydisulfuryl difluoride has been found to substitute a fluorosulfato group for isolated hydrogen in a fluorinated chain. The reaction is initiated by FSO 2 O• radicals and proceeds under mild conditions. Some pyrolyses of fluorosulfates are als
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::98c102dd52140b98dca9b3cfb5849563
https://doi.org/10.1016/s0022-1139(00)83501-0
https://doi.org/10.1016/s0022-1139(00)83501-0
Autor:
Carl George Krespan, David C. England
Publikováno v:
Journal of Fluorine Chemistry. 3:91-111
Perfluoromethacryloyl fluoride has been found to yield predominantly 1,4 cyclo-adducts with olefins, isocyanates, nitriles and ketenes. With olefins and isocyanates, 1,2 cyclo-adducts and open-chain adducts are also formed, and evidence is presented
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a12eef4f8b0d8a41c9b5f66a79145fd
https://doi.org/10.1016/s0022-1139(00)82863-8
https://doi.org/10.1016/s0022-1139(00)82863-8
Publikováno v:
Journal of Fluorine Chemistry. 3:63-89
Trifluoromethylketene has been detected by trapping reactions, but has not been isolated. In the absence of a trapping agent, reactions designed to give the ketene gave its isomer, perfluoroacryloyl fluoride. Convenient syntheses are described for sa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::28001e8baf6a2602e2d1e1bfc8ca1294
https://doi.org/10.1016/s0022-1139(00)82862-6
https://doi.org/10.1016/s0022-1139(00)82862-6
Autor:
Carl George Krespan
Publikováno v:
Journal of Organometallic Chemistry. 213:C61
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c7902314fdb8280153c65cf66ccc6cd
https://doi.org/10.1016/s0022-328x(00)82973-3
https://doi.org/10.1016/s0022-328x(00)82973-3