Les ions α-carbéniums benchrotréniques: mode de génération, exemples d'utilisation a la préparation d'amines, d'éthers et au contrôle stéréochimique lors d'attaques nucléophiles
作者:Siden Top、Gérard Jaouen
DOI:10.1016/s0022-328x(00)93566-6
日期:1980.9
Temporary complexation of benzylic alcohols by the Cr(CO)3 unit considerably enhances the stability of the carbeniumions generated from these alcohols and allows the preparation of amines, ethers by reaction of the ions with ammonia, amines or alcohols. This method also permits the total stereochemical control in the “exo” position of nucleophilicattack in the rigid series (indane, tetraline) and thus
Syntheses and X-ray structure determinations of the isomeric pentaphenylethane tricarbonylchromium(0) complexes, 1-tricarbonylchromium(0) phenyl- 1,1,2,2-tetraphenylethane and 2-tricarbonylchromium(0) phenyl-l,1,1,2-tetraphenylethane
作者:Bijaya Misra、H.E. Zieger、Jon Bordner
DOI:10.1016/0022-328x(88)80341-3
日期:1988.6
(CTC) coordinated pentaphenylethanes (PPE) have been synthesized via organometallic coupling reactions. X-Ray structure determinations have shown the ethane carbon-carbon bond distances in C(1) and C(2) CTC complexes of PPE to be 1.615 (±0.007) and 1.620 (±0.005) Å. Deprotonation of pentaphenylethane with the potassium t-butoxide-n-butyllithium complex gives the pentaphenylethyl carbanion at −70°C in