212510-24-2Relevant academic research and scientific papers
Efficient and Selective Synthesis of Crownopaddlanes Possessing Two Cyclobutane Rings and Exclusive Complexation of Lithium
Inokuma, Seiichi,Takezawa, Masashi,Satoh, Hiroko,Nakamura, Yosuke,Sasaki, Takashi,Nishimura, Jun
, p. 5791 - 5796 (1998)
A new type of crown compounds (crownopaddlanes) bearing two cyclobutane rings were efficiently and selectively prepared by means of intramolecular [2 + 2] photocycloaddition of appropriate styrene derivatives, which was successfully carried out in cyclohexane under irradiation through a Pyrex filter. Crownopaddlanes 4a, 5, and 6 exclusively and quantitatively extracted Li+ on the solid-liquid extraction. Upon the competitive extraction, 4a showed the highest selectivity toward Li+ over Na+ and K+ (Li+/Na+ = 610, Li+/K+ = 976). The structural factors working in the complexation of the crownopaddlane were examined by X-ray crystallographic analysis.
