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能否再帮我查一下CA
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能否再帮我查一下 4,4'(5')-Di-tert-butyldibenzo-18-crown-6 CAS: 29471-17-8 的合成方法，谢谢！！！！！ 在此先谢过了！！！ 烦各位虫友的帮助！！！！！！ |
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lighthouse
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2楼2006-11-13 21:03:06
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Alkylation of benzo crown ethers with alcohols. Kotlyar, S. A.; Klimova, E. I. Vses. Nauchno-Issled. Proektn. Inst. Monomerov, Tula, USSR. Khimiya Geterotsiklicheskikh Soedinenii (1990), (11), 1572-3. Journal written in Russian. Abstract: Alkylation of benzo-12-crown-4, benzo-15-crown-5, dibenzo-21-crown-7, and dibenzo-24-crown-8 (I-IV, resp.) with tert-BuOH in CHCl3/H2SO4 proceeded with the quant. formation of 4-tert-Bu-I and -II, and a mixt. of mono- and disubstituted III and IV; dibenzo-18-crown-6 (V) was converted only partially to its 4-tert-Bu deriv., and benzo-18-crown-6 (VI) was unreactive. Conversion of V to its 4-tert-Bu deriv. was increased to 95% in the presence of NaClO4 or KClO4, while that of VI did not exceed 15%. The role of complexation of the benzo crown ethers with the active carbocationic species was considered. Synthesis and catalytic activity of alkyl and arylalkyl derivatives of dibenzo-18-crown-6. Bogatskii, A. V.; Luk'yanenko, N. G.; Pastushok, V. N. Fiz.-Khim. Inst., Odessa, USSR. Doklady Akademii Nauk SSSR (1983), 271(6), 1392-4 [Chem.]. Journal written in Russian. Abstract: Dibenzo-18-crown-6 derivs. I (R = Me3C, EtCMe2, PhCH2, PhCHMe, PhCHEt, PhCHCHMe2) were prepd. in 83-95% yields by alkylation or aralkylation of I (R = H) with ROH. The substituted I were effective phase-transfer catalysts for esterification of MeCO2K by PhCH2Br, for halide exchange of BuBr by KI, and for alkylation of KSCN by BuI. Cyclic polyethers and their complexes with metal salts. Pedersen, Charles J. E. I. du Pont de Nemours and Co., Inc., Wilmington, DE, USA. Journal of the American Chemical Society (1967), 89(26), 7017-36. Journal written in English Abstract: Thirty-three cyclic polyethers, eg. I, derived from aromatic vicinal diols and contg. from 9 to 60 atoms including 3 to 20 O atoms in the ring, were synthesized. Some of these were prepd. in good yields without the use of a high-diln. technique. Fifteen of the compds. were catalytically hydrogenated to the corresponding satd. cyclic polyethers. Many of those contg. five to ten O form stable complexes with some or all of the cations of: Li, Na, NH4, RNH3, K, Rb, Cs, Ag(I), Au(I), Ca, Sr, Ba, Cd, Hg(I), Hg(II), La(III), Tl(I), Ce(III), and Pb(II). Many of these complexes can be isolated in the cryst. form depending on the anion. They appear to be salt-polyether complexes formed by ion-dipole interaction between the cation and the negatively charged O atoms of the polyether ring. The stoichiometry of the complexes is 1 mol. of polyether per single ion regardless of the valence. Some of the polyethers, by complexing, solubilize inorg. compds., such as KOH and KMnO4, in aromatic hydrocarbons. 23 references. Macrocyclic polyethers with aromatic groups and their cationic complexes. Pedersen, Charles J. (du Pont de Nemours, E. I., and Co.). Fr. (1966), 18 p. FR 1440716 (US 3622577) Process for purifying crown ethers. Tanaka, Shinri; Kawashima, Yasuhiko. (Konica Corp., Japan). Eur. Pat. Appl. (1994), 15 pp. EP 611763 (US 5608058) |
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