Zobrazeno 1 - 10
of 231
pro vyhledávání: '"Z. Janousek"'
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 98:859-864
A method for trapping of transient carbon centered radicals is proposed. The ESR spectra of radical adducts 4 deriving from α-tert.butylthioacrylonitrile 3a give more information concerning the scavenged radical 2 than the other known radical traps.
Autor:
N. Guillot, F. Evariste, Robert Merényi, Marie-Aimée Decock-Plancquaert, C. Maliverney, Z. Janousek, Heinz G. Viehe
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 101:313-321
New 4-trifluoromethyl-1,3-oxazin-6-ones have been prepared in excellent yields from ethyl 3-amino-4.4.4-trifluorocrotonate (ATFC) by two original procedures: reaction of ATFC with phosgeniminium chlorides to give 2-dialkylamino-4-trifluoromethyl-1,3-
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 102:129-140
Phosgeniminium salt 1 easily condenses with vinylogues of malononitrile 4 to yield new gamma,gamma-dicyano-alpha-chlorodienamines 13 which can undergo substitutions and heterocyclisation reactions. Vinylogues of malonate do not react with 1 whereas t
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 97:1045-1054
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 102:663-668
The reaction of β-tert.- aminoacrylonitriles 1 a-1c with dimethyl acetylenedicarboxylate (DMAD) to give pyrrolizidine, indolizidine and pyrroloazepine is described.
Publikováno v:
Tetrahedron. 53:15717-15728
Treatment of 2,2,2-trifluoroethyl-t-butyl sulfoxide 8 under acylating conditions, in the presence of various alkenes or 1-hexyne gives beta-trifluoroacetoxy trifluoroethyl thioethers in good yields. Activated aromatic compounds furnish ortho and main
Publikováno v:
Tetrahedron. 53:6861-6872
The Diels-Alder reaction of 2-phenylthio-3,3,3-trifluoropropene 1 and its derivatives sulfoxide 2 and sulfone 3, respectively was carried out with cyclopentadiene, 2,3-dimethylbutadiene, butadiene and isoprene to give the [4+2] cycloadducts in good t
Publikováno v:
Journal für Praktische Chemie/Chemiker-Zeitung. 339:697-707
A general synthesis of trifluorodithioacetates is described by thiolysis of trifluorothioamidium salts, derived from trifluorothioacetamides. The reactivity of these CF3 bearing C-2 building blocks has been investigated towards nucleophiles and in cy
Publikováno v:
Journal f�r Praktische Chemie/Chemiker-Zeitung. 336:19-28
An improved synthesis of CTMC is described. This cyclobutene is thermally stable towards electrocyclic ring opening. Its reactivity is explored and a number of radical adducts are described. A more complicated picture is observed with various nucleop
Publikováno v:
Tetrahedron Letters. 34:5711-5714
Alpha-trifluoromethyl iminium trifluoroacetates 5 can be prepared from N-oxides 4 and used in situ or after isolation. Condensation occurs with carbonyl activated methylene groups to give useful beta-trifluoromethyl vinyl ketones 8.