Synthesis of lanthanide(II)–imine complexes and their use in carbon–carbon and carbon–nitrogen unsaturated bond transformation
作者:Ken Takaki、Kimihiro Komeyama、Katsuomi Takehira
DOI:10.1016/j.tet.2003.06.003
日期:2003.12
1 quantitatively, the structure of which was characterized by X-ray analysis. The imine complexes 1 catalyzed dehydrogenativesilylation of terminal alkynes, hydrosilylation of imines and alkenes, and intermolecular hydrophosphination of alkynes. Moreover, dehydrogenative double silylation of conjugated dienes was achieved with 1.
Kinetic investigation of the type 2 intramolecular Diels-Alder cycloaddition
作者:K. J. Shea、L. D. Burke、W. P. England
DOI:10.1021/ja00211a026
日期:1988.2.3
Cycloaddition intramoleculaire de divers esters dienyne comportant pour la plupart une fonction ether entre les parties diene et dienophile. Effet de la position de l'atome d'oxygene et de la longueur de chaine sur la cinetique. Obtention de derives d'oxabicycloundecadiene8-, -dodecadiene, -tridecadiene et du bicyclo [5.3.1] undecadiene-1,7carboxylate-8 de methyle
Cycloaddition Intramoleculaire de diversesters dienyne comportant pour la plupart une fonction ether entre les party diene et dienophile。Effet de la position de l'atome d'oxygene et de la longueur de chaine sur la cinetique。得到 d'oxabicycloundecadiene8-, -dodecadiene, -tridecadiene et du bicyclo [5.3.1] undecadiene-1,7carboxylate-8 demethyle
Hydrosilylation of olefins and dehydrogenative double silylation of conjugated dienes catalyzed by lanthanide–imine complexes
Divalent lanthanide–imine complexes and a related species catalyzed the hydrosilylation of olefins with phenyl- and diphenylsilane. On the other hand, conjugated dienes were converted to 1,4-bissilyl-2-butenes and 3-silacyclopentenes, accompanied with hydrogen evolution, under similar conditions.
Copper complexes generated in situ from CuCl2, alkylGrignardreagents, and 1,3‐dienes play important roles as catalytic active species for the 1,2‐hydroalkylation of 1,3‐dienes by alkylfluorides through CF bond cleavage. The alkyl group is introduced to an internal carbon atom of the 1,3‐diene regioselectively, thus giving rise to the branched terminal alkene product.
Isoprene has been metalated in tetrahydrofuran with an excess of sterically hindered potassium dialkylamides, prepared by combining equimolar amounts of the corresponding lithium amide and potassium tert-butoxide. Subsequent reaction with oxirane, alkyl bromides, and pivaldehyde gave the expected coupling products in reasonable yields. Coupling with (CH3)2CHCH2CHO and (CH3)2CCHCHO afforded the bark