15-Sep News Extracurricular laboratory:new discovery of Dibenzo-18-crown-6

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In an article, published in an article, once mentioned the application of 14187-32-7, Name is Dibenzo-18-crown-6,molecular formula is C20H24O6, is a conventional compound. this article was the specific content is as follows.category: chiral-catalyst

Stability constants Kf(LK+) and Kf(LKX) = / at 25 deg in the dipolar aprotic solvents acetone (Me2CO), acetonitrile (MeCN), propylene carbonate (pc), N,N-dimethylformamide (HCONMe2), dimethyl sulfoxide (Me2SO), as well as in the alcohols, methanol (MeOH), isopropyl alcohol (PriOH), and butan-1-ol(BuOH) have been determined, L being bis(4,4′(5′)-t-butylbenzo-18-crown-6 (di(BuBo)-18-cr-6).This crown is considerably more lipophylic than is dibenzo-18-crown-6.Values of Kf(LKX) have been found from values of Kf(LK+), KA(KX) and KA(LKX).Transfer activity coefficients Me2COgammaSi have been calculated (based on the Parker proposal that gamma(Ph4As+) = gamma(BPh4-) between acetone and the various solvents used of K+, Br-, ClO4-, Pi- (picrate), LK+, KX, and LKX.It is found that K+ is more strongly solvated in Me2CO than in the other aprotic solvents of low donicity.The reverse is true between Me2CO and HCONMe2 or MeSO (even after correcting for the Born effect).

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Reference:
Chiral Catalysts,
Chiral catalysts – SlideShare