Face selection in addition and elimination in sterically unbiased systems
Article Abstract:
The steric factor influences the configuration of an atom when an additional ligand is bound to the central atom. The affected trigonal site may be planar or pyramidal as a result of substitution reactions. Studies where the steric bias is nearly zero reveal that elimination to produce trigonal centers revolves about relative rates. Addition processes and their corresponding configurational preferences may be explained using the theory of transition-state hyperconjugation.
Publication Name: Chemical Reviews
Subject: Chemistry
ISSN: 0009-2665
Year: 1999
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Novel cavity design using calix[n]arene skeletons: toward molecular recognition and metal binding
Article Abstract:
Novel strategies for cavity design using calix[n]arene skeletons were proposed. The strategies allow complexation of specific molecular targets or metal ions. Manipulation of calix[n]arene conformation was found to promote molecular recognition and ion binding. It was expected that the novel cavity shapes of these macrocylic molecules will be developed to include other guests in the cavity with high affinity and high selectivity.
Publication Name: Chemical Reviews
Subject: Chemistry
ISSN: 0009-2665
Year: 1997
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Asymmetric hydroformylation
Article Abstract:
Between the platinum and rhodium catalyst systems, the latter gives a complete chemoselectivity when used for asymmetric hydroformylation. Temperature, pressure and composition of the catalytic systems are the reaction parameters for the two metals. Hydroformylations performed in the presence of the platinum-tin system linked to a chiral diphosphine are more enantioselective than the rhodium systems.
Publication Name: Chemical Reviews
Subject: Chemistry
ISSN: 0009-2665
Year: 1995
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