91200-45-2Relevant articles and documents
Modifizierte Isopinocampheyldibromoborane; selektive Katalysatoren fuer asymmetrische Diels-Alder-Rekationen
Bir, Gerhard,Kaufmann, Dieter
, p. 1 - 6 (2007/10/02)
The synthesis of C-10 phenyl- and t-butyl modified isopinocampheyldibromoboranes is described.Their ability to act as chiral catalysts in asymmetric Diels-Adler reactions has been investigated as exemplified by the reaction of cyclopentadiene with methylacrylate.
THE REGIOSELECTIVITY OF RHODIUM AND PALLADIUM-CATALYSED CYCLISATIONS OF 2-BROMO-1,6- AND 1,7-DIENES
Grigg, Ronald,Stevenson, Paul,Worakun, Tanachat
, p. 2033 - 2048 (2007/10/02)
2-bromo-1,6-dienes are catalytically cyclised to a mixture of the corresponding 3,4-bis(methylene)cyclopentane and 5-methylenecyclohex-3-ene.Wilkinson's catalyst shows good selectivity for the 5-membered ring product whilst palladium catalysts, in general, show little selectivity.Addition of tetraethylammonium salts, especially the chloride, allow the palladium catalysed reactions to be carried out at 30 deg C in good yield and with high selectivity for the 5-membered ring. 2-Bromo-1,7-dienes are cyclised regiospecifically to 6-membered rings by the same catalysts although some double bond isomerisation also occurs.The mechanism of the catalytic cyclisations is discussed.The 3,4-bis(methylene) cyclopentanes undergo facile Diels-Alder reactions.
ALKYLATION DE TERPENES EN DEUX ETAPES PAR ENE-REACTION
Deleris, G.,Dunogues, J.,Gadras, A.
, p. 2135 - 2138 (2007/10/02)
A simple, two-step homologation of terpenes is reported that requires ene-reaction with PhSO2NSO and subsequent of the intermediate adducts with CuI catalyzed Grignard