133708-88-0Relevant academic research and scientific papers
Novel calixarene based dispersible colloidal systems in the form of nanoparticles
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Page/Page column 4, (2008/06/13)
A water dispersible colloidal system in the form of generally spherical matrix type particles and of sizes typically in the range of from 50 to 500 nm, called nanoparticles, and a process for the preparation of such systems. The system is characterized in that the nanoparticles comprise at least one amphiphilically modified calixarene. The water dispersion contains at least one active component such as a cosmetic, a pharmaceutical compound or other biologically active substances, foods, beverages, etc. enclosed within the nanoparticles, in the outer aqueous phase, or in both. The systems show outstanding properties, especially long-life stability even at elevated la temperatures.
New Syntheses and Physical Properties of p-Alkylcalixarenes
Shinkai, Seiji,Nagasaki, Takeshi,Iwamoto, Koji,Ikeda, Atsushi,He, G.-X.,et al.
, p. 381 - 386 (2007/10/02)
Calixarenes (n=4, 6, and 8) bearing long p-alkyl groups (R=hexyl or dodecyl) have been synthesized by "direct" acylation of the p-position followed by silane reduction.The method is convenient and the yields are higher than those reported so far.Among them, p-hexanoylcalixarene showed a curious phase transition behavior; with raising the temperature it changed as crystal A -> liquid -> crystal B -> liquid.It was found on the basis of the solid 13C NMR spectra that this behavior is ascribed to a conformational change from "cone" (crystal A) to "partial cone" (crystal B).
