Synthesis of (4S,5S)-trans-4-(cyclopentadiene-1-methyl)-5-diphenylphosphine-2,2-dimethyl-1,3-dioxolane and the ferrocene derivative; trans-
The syntheses of the chiral cyclopentadiene compound (4S,5S)-trans-4-(cyclopentadiene-1-methyl)-5-diphenylphosphine-2,2-dimethyl-1,3-dioxolane (4) and of the related ferrocenylphosphine derivative trans- (5) are described.
High linear selectivity ligand for allyl alcohol hydroformylation
A process for selectively producing 4-hydroxybutyraldehyde from allyl alcohol is described. The process comprises reacting allyl alcohol with a mixture of carbon monoxide and hydrogen in the presence of a solvent and a catalyst system comprising a rhodium complex and a trans-1,2-bis(bis(3,4,5-tri-n-alkylphenyl)phosphinomethyl)-cyclobutane. The process gives high yield of 4-hydroxybutyraldehyde compared to temperature.
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Page/Page column 7; 8
(2020/11/28)
Decarboxylative aldol reactions of allyl β-keto Esters via heterobimetallic catalysis
Mild and selective heterobimetallic-catalyzed decarboxylative aldol reactions involving allyl β-keto esters have been developed. The reaction is promoted by Pd(0)- and Yb(III)-DIOP complexes at room temperature and involves the in situ formation of a ketone enolate from allyl β-keto esters followed by addition of the enolate to aldehydes. The reaction is a new example of heterobimetallic catalysis in which the optimized reaction conditions require the addition of both metals. Copyright
Lou, Sha,Westbrook, John A.,Schaus, Scott E.
p. 11440 - 11441
(2007/10/03)
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