By Thomas Kappe (auth.), J. Vicens, Z. Asfari, J. M. Harrowfield (eds.)
We are proud to have a good time the fiftieth anniversary of the calixarenes. In 1944, Zinke and Ziegler proposed a cyclotetrameric constitution for an oligomer extracted from the condensation product blend acquired via reacting p-tert-butyl phenol with formaldehyde within the presence of sodium hydroxide.
Fifty years on, calixarenes are the root of many various parts of chemical examine, with improvement taking place at an expanding velocity during the last decade specifically. the current quantity doesn't offer an summary of some of these advancements, yet is very a party of a few of the highlights. This presentation of the problematic mosaic of variety that characterizes calixarene chemistry will stimulate extra advancements during this attention-grabbing box.
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Extra resources for Calixarenes 50th Anniversary: Commemorative Issue
Vogt: unpublished results. 33. B. Dhawan and C. D. Gutsche: J. Org. Chern. 48,1536 (1983) and references therein. 34. (a) T. Yamato, Y. Saruwatari, S. Nagayama, K. Maeda, and M. Tashiro: J. Chern. , Chern. Cornrnun. 861 (1992). (b) T. Yamato, M. Yasumatsu, H. Ota, Y. K. Doamekpor: J. Incl. Phenorn. 19,315 (1994) (this volume). 35. (a) Y. Okada, F. Ishii, Y. Kasai, and J. Nishimura: Chern. Lett. 755 (1992). (b) Y. Owada and J. Nishimura: J. Incl. Phenorn. 19,41 (1994) (this volume). 36. (a) O. Aleksiuk, F.
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The molecule has C4 symmetry, but a 1,3-altemate conformation with C2 symmetry is found in the crystalline state . 11. Spherand-Type Calixarenes Condensation of 2,2'-dihydroxy-5,5'-di-tert-butyldiphenol with formaldehyde leads to macrocyclic molecules 35 which combine structural features of a calixarene and a spherand [48, 49]. They have three or four methylene groups: less than a calix- or -arene and more than the corresponding spherand. Their IH-NMR spectrum which shows one singlet for t-butyl, methylene and hydroxyl protons and a pair of doublets for the aromatic protons, indicate that these parent macrocycles are either highly symmetrical or rather flexible molecules.