Search results for "Magnesium bromide"
showing 7 items of 7 documents
ChemInform Abstract: Selective “One-Pot” Synthesis of Functionalized Cyclopentenones.
2012
Reaction of squaric acid derivatives with vinyl magnesium bromide followed by treatment with trifluoroethanol allows a new and stereoselective access to functionalized cyclopentenones of type (III)/ (V).
Über Serotoninderivate mit cyclisierter Seitenkette, 1. Mitt. Darstellung der isomeren 3-(Piperidylmethyl)- und 3-(Piperidylmethyl)-5-hydroxyindole
1975
Es wird die Synthese der drei isomeren 3-(Pyridylmethyl)- und 3-(Piperidylmethyl)-5-hydroxyindole beschrieben. Die 3-(Pyridilmethyl)-5-benzyloxyindole wurden durch Kondensation von 5-Benzyloxyindolylmagnesiumbromid mit den drei isomeren Chlormethyl-pyridinbasen dargestellt. Katalytische Reduktion ihrer quartaren Salze fuhrte zu den entsprechenden Piperidinverbindungen. Die 5-Benzyloxyindole wurden durch hydrierende Debenzylierung in die 5-Hydroxyindolverbindungen ubergefuhrt. 3-(Pyridylmethyl)- and 3-(Piperidylmethyl)-5-hydroxyindoles The synthesis of the three isomeric 3-(pyridylmethyl)- and the 3-(piperidylmethyl)-5-hydroxyindoles is described. To obtain the 3-(pyridylmethyl)-3-benzyloxyi…
Synthesis and Properties of Some Simple Organotitanium Compounds
1986
Before embarking on a detailed discussion of the titanation of carbanions, synthetic and physical organic aspects of several typical organotitanium (IV) compounds shall be surveyed, including thermal stability, aggregation state, X-ray structural data and bond energies. Some of this information is useful in understanding reactivity and selectivity in reactions with organic substrates. Low valent Ti (II) and Ti (III) shall be mentioned only on passing; the interested reader is referred to reviews [1].
Selective "one-pot" synthesis of functionalized cyclopentenones.
2012
Double addition (1,2-1,4) of vinyl magnesium bromide to squaric acid derivatives allows the preparation of polyoxygenated cyclopentenones (8) in a "one-pot" procedure. The reaction occurs through the intermediate formation of octatetraenes (6). Protonation of this latter intermediate at -78 °C with TFE occurs selectively at the vinyl CH(2) closer to the metallic centers. DFT studies of the cyclization step justify the observed diastereoselectivity.
Cyclopentadienylmolybdenum(II) and -(III) complexes containing diene and allyl ligands. Part 4. Reactivity studies of the bisallyl complex CpMo(supin…
1998
Abstract Compound CpMo( η 3 -C 3 H 5 ) 2 , 3, has been synthesized from CpMoCl 4 and four equivalents of allylmagnesium bromide. While the compound is stable in donor solvents at room temperature, warming in refluxing MeCN induces the formation of 1,5-hexadiene by a metal-mediated allyl-allyl coupling process. Treatment of 3 with Bu t NC at room temperature affords CpMo( η 3 -C 3 H 5 )(Bu t NC) 2 , 4. A similar reduction with presumed allyl radical loss occurs for [CpMo( η 3 -C 3 H 5 )( η 4 -C 4 H 6 )] + , [1c] + , to afford [CpMo( η 4 -C 4 H 6 )(Bu t NC) 2 ] + , 5. Treatment of [1c] + with methyllithium affords two products, the major one (1c) corresponding to the one-electron reduction pa…
Darstellung und charakterisierung von einigen neuen bis(1-phenylvinyl)-verbindungen
1974
Einige neue Bis(1-phenylvinyl)-Verbindungen (1b, c und 2a–d) wurden aus den entsprechenden Diacetylverbindungen und Phenylmagnesiumbromid dargestellt. Ihre IR-, NMR-und Massenspektren werden diskutiert. Some new bis(1-phenylvinyl) compounds (1b, c and 2a–d) were prepared from the corresponding diacetyl compounds and phenyl magnesium bromide. Their IR, NMR and mass spectra are discussed.
p-Di-(1-phenylvinyl)-Benzol und seine reaktion mit elektronenüberträgern
1972
p-Di-(1-phenylvinyl)-benzol (I) wurde, ausgehend von p-Diacetylbenzol und Phenylmagnesiumbromid, in hoher Reinheit und guter Ausbeute dargestellt und charakterisiert. I setzt sich spontan mit Elektronenubertragern (Natrium, Naphthalin-Natrium) unter Ausbildung einer tief violetten Farbung um. Es entstehen die Oligomeren bis zum Dekameren, wobei die geradzahligen Homologen in hoherer Konzentration vorliegen als die jeweils benachbarten ungeradzahligen. Die Ergebnisse werden diskutiert. p-Di-(1-phenylvinyl) benzene (I) was prepared from diacetyl benzene and phenyl magnesium bromide in high purity and with good yield. It was identified by IR, NMR, and elemental analysis. I reacts immediately w…