ChemInform Abstract: Asymmetrically Substituted Calix(4)arenes. A Two-Dimensional 1H NMR Study of a Tetraester Derivative in the cone-Conformation.

ChemInform Abstract: Direct Synthesis of Calix(4)arenes with Two Different Phenolic Units in Alternating Order.

ChemInform Abstract: Dissymmetric Calix(4)arenes with C4- and C2-Symmetry. Synthesis, X-Ray Structures, Conformational Fixation, and 1H NMR Spectroscopic Studies.

Asymmetrically substituted calix[4]arenes; A two-dimensional 1H NMR study of a tetraester derivative in the cone-conformation

Abstract Several new chiral calix[4]arenes with three or four different substituents in the p-position have been prepared by fragment condensation. Standard derivatization procedures always led to the formation of mixtures of various conformational isomers from which the derivative in the cone-conformation could be isolated only by preparative HPLC. For a tetraester derivative it was shown by two-dimensional 1H NMR spectroscopy, that due to the different substituents the cone-conformation is strongly distorted. The sodium complex of this tetraester, however, assumes a regular cone-conformation again.

ChemInform Abstract: A New Route to Chiral Calix(4)arenes via 1,3-Derivatization.

ChemInform Abstract: Dissymmetric Calix(4)arenes with C2 and C4 Symmetry.

Synthese de tetrahydroxy-octamethyl [1 4 ] Metacyclophane a partir de 3,4-dimethylphenol. Le tetrahydroxy-octamethyl [1 4 ] Metacyclophane reagit avec le bromoacetate d'ethyle pour donner tetrakis [(ethoxycarbonyl) methoxy]-octamethyl [1 4 ] Metacyclophane qui est analyse par diffraction RX