Affiliation:
1. 1Institut für Anorganische und Analytische Chemie, Technische Universität Carola Wilhelmina, Hagenring 30, D-38106 Braunschweig, Germany
2. 4Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Victoriei Square 2, Ro-300006 Timisoara, Romania
Abstract
AbstractNew chiral derivatives of 15,35,55,75-tetra-tert-butyl-1,3,5,7(1,3)-tetrabenzenacyclooctaphane-12,32,52,72-tetraol [(1); tert-butyl-calix[4]-arene] were synthesized by coupling modified chiral quinuclidines derived from the natural-product-based alkaloids quincorine and quincoridine with the calix[4]arene 1 via either an ester bond or an amide bond. X-ray analyses of two products were performed. Applications of the products in asymmetric catalytic hydrogen transfer reactions are described. A protocol is presented to multi-substitute calix[4]arene at the methylene bridges, resulting in, e.g., 2,6-carboxyl-all-tert-butyl all-methoxy-calix[4]arene.
Subject
General Chemical Engineering,General Chemistry
Reference112 articles.
1. Berichte;Neda;Chem,1995
2. No;David Gutsche;Tetrahedron,1983
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