Titlebook: Calixarenes: A Versatile Class of Macrocyclic Compounds; J. Vicens,V. Böhmer Book 1991 Kluwer Academic Publishers 1991 Claisen rearrangeme

euphoria

R. Taurines,C. Wewetzer,A. Warnke,M. Gerlachthe crown ethers [11], cryptands [12] and spherands [13] perhaps signifies the most important recent development of the field. Certainly it is now possible to exert numerous subtle forms of control over the coordination of phenolic oxygen and consequently over the properties of the metal ion to which it is bound.

不透气

forestry

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使虚弱

沉默

Special Calixarenes, Synthesis and Propertiesscribed. However, these procedures necessarily lead to calixarenes consisting of one single type of phenolic unit. This remains true even for those compounds in which all the .-butyl groups are removed and replaced by other functional groups. The construction of more sophisticated, special calixaren

合同

Conformations of Calixarenes in the Crystalline Stateo form a . cyclic oligomer, a calixarene in high yield, is most remarkable. Although the mechanism of the formation of calixarenes is far from being well understood it seems clear that it involves the production of hydroxymethylated phenols during the first steps which then, by condensation, lead to

松驰

Calixarene-Based Cation Receptors and Carriersown ethers [1], there is a continuous need for new building blocks, shaping units or substructures to be used in the construction of new cation receptors and carriers showing improved efficiency and selectivity. For the complexation of spherical alkali and alkaline earth cations [2–4] the most effec

BLA

Chemically Modified Calixarenes as New Selective Receptors for Monovalent Cationsetic acid, these small spherical cations were thought to be incapable of complex formation with any known ligand. Consequently, they were frequently used in large excess as the supporting electrolyte in studies of cation complexation in solution. The coordination chemistry of the alkali cations blos

粗鲁性质

Functionalized Calixarenes: New Applications as Catalysts, Ligands, and Host Moleculesst—guest chemistry related to calixarenes have been very limited [1–3]. In fact, Gutsche stated in his 1985 review article that there are no published data in support of solution complexes of calixarenes [2]. This is in sharp contrast to cyclodextrins which can form a variety of host—guest-type solu