Advanced Materials Research Vols. 554-556

Abstract: O-nitrotoluene is condensed with N, N-dimethylformamide dimethyl acetals in the presence of piperidine and DMF to yield trans-β-dimethylamino-2-nitrostyrene which undergoes hydrolysis in the 18% HCl aqueous solution to obtain o-nitrophenylacetaldehyde with yield of 83% and purity of 98.1% respectively.

Abstract: γ-Unsecalactone was prepared efficiently via the free radical addition reaction with acrylic acid and n-octanol as raw materials. An improved process which used Dean-Stark trap with adding anhydrous Na₂SO₄ as desiccant was developed. Through the orthogonal experiments about the dosages of di-t-butyl peroxide(DTBP) and zinc bromide (ZnBr₂), the optimal reaction conditions were as follows:n(DTBP): n(acrylic acid) = 0.160, n(ZnBr₂): n(acrylic acid) = 0.050. The yield of γ-unsecalactone based on the optimal reaction conditions reached 71%.

Abstract: A novel discotic D-A-D system compound composed of perylene diimide (PDI) and thiophene was synthesized through photocyclization under sunlight in the presence of catalytic amount I₂ and characterizated by ^1H NMR.

Abstract: Boric acid and glycerol were adopted as the starting materials to react with cation exchange resin (CER) as the catalyst. The conversion of the products was characterized by acid value, titrated by potassium hydroxide (KOH) ethanol solution. It showed that the yield of the optimum products got to about 89%. Then they were modified with EO, gaining more than four carbon chains, and hydrolytic time was prolonged to 48 h. The structures of the unmodified and modified products were further confirmed by IR. The results indicated that hard hydrolytic borate ester surfactants with C-O-C bond were synthesized.

Abstract: A new vanadium complex [ V(C₁₂H₈N₂) ·O₂·(H₂O)]·NO₃·H₂O h as been synthesized from a simple reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. Monoclinic, P2(1)/c. a = 9.5137(2) Å b = 19.3181(4) Å c = 7.51800(10) Å α=γ=90 β= 93.6830. V= 1378.85(4) Å3. Z=2. Rgt(F) = 0.0255, wRref(F2) = 0.0809. T= 273(2) K. The compound consisted of a [ V(C₁₂H₈N₂) ·O₂·(H₂O)]+ cation, one NO₃^- anion and one water molecular. Molecule structure is stabilized by OHN , OHO intramolecular and intermolecular hydrogen bonds.

Abstract: Inorganic ion exchanger Li2Mn0.75Ti0.25O3 is synthesized. It was prepared by a solid state reaction crystallization method. The results showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 7.4 mmol•g-1 for Li+. It had a memorial ion-sieve property for Li+.

Abstract: Compound [Li₂MnO₃], a spinel-type metal compound, was prepared by a solid state reaction crystallization method. The results showed that the Li⁺ extraction/insertion be progressed mainly by an ion-exchange mechanism. Results of column test indicated, that the exchange capacity obtained from tests for Li⁺ in 0.1mol/L HNO₃ solution is 7.0 mmol•g^-1.It had a memorial ion-sieve property for Li⁺

Abstract: The quaternary ammonium salt cationic surfactant with long-chain alkyl and epoxy groups is very important intermediate product to synthesis novel functional surfactants. In this paper, a kind of quaternary ammonium salt cationic surfactant with long-chain alkyl and epoxy groups was synthesized by traditional method with epichlorohydrin and N-octadecyldimethylamine as raw materials. During the synthesis, the best reaction conditions have been obtained, that the reaction temperature is 35 °C, the reaction time is 4 h and the best mol ratio of epichlorohydrin to timethylamine is 5:1. In addition, the synthesized intermediate with long-chain alkyl and epoxy groups plays a very important roles in the development of cationic surfactant.

Abstract: 2,2-Dithiobis(pyridine-N-oxide) (1) was prepared by reacting 2-pyridinethiol-N-oxide (2) and hydrogen peroxide-urea adduct (3) at the molar ratio of 1:1.25 and 45oC for 1.75h in high yield and purity of 91.6% and 99.6% respectively. The structures of product were characterized by IR, NMR.

Abstract: Compound [Li₂Mn_0.5Ti_0.5O₃], a spinel-type metal compound, was prepared by a solid state reaction crystallization method. The Li⁺ extraction/insertion with this material were investigated by X-ray and Kd measurement. The chemical analysis showed that the Li⁺ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 7.7mmol/g for Li⁺.