AIM To isolate the chemical components from extracted crude of Psoralea corylifolia L. METHODS Applicate the function of molecular recognition in supramolecular chemistry, use 1,1,6,6 tetraphenylhexa 2,4 diyne 1,6 dio...AIM To isolate the chemical components from extracted crude of Psoralea corylifolia L. METHODS Applicate the function of molecular recognition in supramolecular chemistry, use 1,1,6,6 tetraphenylhexa 2,4 diyne 1,6 diol as the host molecule and chemical components in extracted crude of Psoralea corylifolia L. as guest molecules, which represent different from either in sort, quantity and sites of function groups or in structural topological character, 1,1,6,6 tetraphenylhexa 2,4 diyne 1,6 diol could selectively form inclusion compound with component endowed with interactional complementarity and isolate as crystalline from the extracted crude of Psoralea corylifolia L. RESULTS The isopsoralen as guest molecule is selectively included by 1,1,6,6 tetraphenylhexa 2,4 diyne 1,6 diol in inclusion crystal and removed by acetone from the inclusion compound and total yield is 0 18%. Isopsoralen is determined by UV, IR, 1HNMR and MS and its inclusion compound is determined by means of IR, powder XRD and single crystal XRD. The isolation effect is analyzed by GC/MS. CONCLUSION The method is simple and selective for isolation isopsoralen from extracted crude of Psoralea corylifolia L.展开更多
A series of copolyesters poly(ethylene terephthalate p-oxybenzoate) (PETO) de-rived from terephthalic acid, ethylene glycol and 4, 4’ -oxybis (benzoic acid) were easily pre-pared by using DMT method and thermally inv...A series of copolyesters poly(ethylene terephthalate p-oxybenzoate) (PETO) de-rived from terephthalic acid, ethylene glycol and 4, 4’ -oxybis (benzoic acid) were easily pre-pared by using DMT method and thermally investigated. Introduction of 4, 4’ -oxydipheny-lene group into the main chain resulted in a lowering of Tm. a decrease of crystallization rate and an increase of thermal-oxidative stability of the copolyesters. By static elongation of PETO, transparent films with qualified electrical properties and mechanical properties were easily obtained with film forming rate 100%. In comparison with poly (ethylene terephthalate) (PET) film, PETO film had obviously low Tm. and low crystallization temper-ature. Due to the presence of stable aromatic ether structure, decrease in Tm. could not lead to any reduction in thermal-oxidative stability, on the contrary, slight increase was ob-served. PETO film could be used in making heat resistant thick film for channel insulators of electric motor.展开更多
文摘AIM To isolate the chemical components from extracted crude of Psoralea corylifolia L. METHODS Applicate the function of molecular recognition in supramolecular chemistry, use 1,1,6,6 tetraphenylhexa 2,4 diyne 1,6 diol as the host molecule and chemical components in extracted crude of Psoralea corylifolia L. as guest molecules, which represent different from either in sort, quantity and sites of function groups or in structural topological character, 1,1,6,6 tetraphenylhexa 2,4 diyne 1,6 diol could selectively form inclusion compound with component endowed with interactional complementarity and isolate as crystalline from the extracted crude of Psoralea corylifolia L. RESULTS The isopsoralen as guest molecule is selectively included by 1,1,6,6 tetraphenylhexa 2,4 diyne 1,6 diol in inclusion crystal and removed by acetone from the inclusion compound and total yield is 0 18%. Isopsoralen is determined by UV, IR, 1HNMR and MS and its inclusion compound is determined by means of IR, powder XRD and single crystal XRD. The isolation effect is analyzed by GC/MS. CONCLUSION The method is simple and selective for isolation isopsoralen from extracted crude of Psoralea corylifolia L.
文摘A series of copolyesters poly(ethylene terephthalate p-oxybenzoate) (PETO) de-rived from terephthalic acid, ethylene glycol and 4, 4’ -oxybis (benzoic acid) were easily pre-pared by using DMT method and thermally investigated. Introduction of 4, 4’ -oxydipheny-lene group into the main chain resulted in a lowering of Tm. a decrease of crystallization rate and an increase of thermal-oxidative stability of the copolyesters. By static elongation of PETO, transparent films with qualified electrical properties and mechanical properties were easily obtained with film forming rate 100%. In comparison with poly (ethylene terephthalate) (PET) film, PETO film had obviously low Tm. and low crystallization temper-ature. Due to the presence of stable aromatic ether structure, decrease in Tm. could not lead to any reduction in thermal-oxidative stability, on the contrary, slight increase was ob-served. PETO film could be used in making heat resistant thick film for channel insulators of electric motor.
