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Cyclic Host Having Double Bonds as Bridging Units
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  • Cyclic Host Having Double Bonds as Bridging Units
  • Cyclic Host Having Double Bonds as Bridging Units
저자명
Paek. Kyung-Soo,Cram. Donald J.
간행물명
Bulletin of the Korean Chemical Society
권/호정보
1989년|10권 6호|pp.568-572 (5 pages)
발행정보
대한화학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

Terphenyl dialdehyde 6 was obtained in 17.4% overall yield through oxidative coupling, methylation, and bisformylation reactions starting from p-cresol, and then coupled intermolecularly using McMurry reaction to give 22-membered macrocylic host 7 in 14.4% yield. In crystal structure host 7 has $C2_v$ symmetry with cis-cis configuration of two double bonds. Four methoxy groups adjacent to double bonds and the other two methoxy groups are directed opposite side, forming a cavity which can nest a guest. The cavity is filled by two inward-turned methyl groups out of four methoxy groups adjacent to double bonds. The kinetically controlled reaction mechanism leading to cis product was proposed. The cation binding properties of 7 were obtained using picrate extraction experiment from $D_2O; into; CDCl_3; at; 25^{circ}C$. All the spherical cations (from $Li^+ to NH4^+)$ are complexed with free energies of $7.3{pm}0.3$ kcal/mol.