中国化学快报

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THE REGIOSELECTIVE SYNTHESIS OF NOVEL PHENYLSULFONES BEARING ISOPRENE UNITS

He Sheng ZHANG, Jia Wei CHEN, Li JIN

中国化学快报. 1993, 4(05): 377-378.

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可视化

The facile and regioselective synthesis of some novel phenylsulfones bearing isoprene units were accomplished by using the corresponding terpenoid compounds as the starting material through ene-chlorination and phenylsulfonyl group substritution steps. The yields are excellent and the experimental conditions are very mild.

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SYNTHESIS OF N,N'-DISUBSTITUTED MONOTHIOXAMIDE AND STUDY OF THEIR REACTIONS WITH DIAMINES

Yu Ren YUAN, Da Qing SUN, Ke Qian CHEN, Zhong E LU, Hai Kang YANG

中国化学快报. 1993, 4(05): 379-380.

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In this paper, six N,N'-disubstituted aonothioxamides were synthesized and the reactions between these monothioxamines and diamines (1,2-diamino ethane and 1,3-diamino propane) were studied. Some new compounds were synthesized by using these reactions.

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SOLID-LIQUID PHASE TRANSFER CATALYTIC SYN THESIS Ⅸ: THE SYNTHESIS OF α-AMINO ACIDS VIA ALICYLATION OF ALDIMINE UNDER MICROWAVE IRRADIATION

Run Hua DENG, Ai Qiao MI, Yao Zhong JIANG

中国化学快报. 1993, 4(05): 381-384.

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The rapid alkylation of methyl N-benzylidene glycinate with halides under microwave irradiation using solid-liquid phase transfer condition without solvent has been achieved wilhin only one minute. After hydrolysis of alkylated products the corresponding α-amino acids were obtained in overall yield 43.6~62.5%.

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A NEW ROUTE FROM HETEROAROMATIC BORON COMPOUNDS TO CORRESPONDING KETONES VIA DICHLOROCARBENE INSERTION UNDER PHASE TRANSFER CONDITIONS

De Jie ZHAO, Jin Kun HUANG, Zi Xing SHAN

中国化学快报. 1993, 4(05): 385-386.

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The reactions of tri-2-benzofuranylborane or aminoethyl di-2-thienylborinate and 2-thienylphenylborinate with dichlorocarbene generated in situ from chloroform under phase transfer conditions were explored as a new route for the preparation of heteroaromatic ketones. It was found that a good yield of the ketones can be obtained by solid-liquid system.

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SYNTHESIS AND PROPERTIES OF NEW INTERPOLYMERIC COMPLEXES

Shu Mei DENG, Jing LIN, Xu ZHANG

中国化学快报. 1993, 4(05): 387-390.

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β-(2-imidazolinyl)-ethyl methyl diethoxy silane quarternary halides and its condensed polymers with bisphenol A were synthesized and characterized. The polycationpolyanion complexes were prepared by the condensed polymers and poly (styrene sulfonate). The solubility and thermal stability of interpolymeric complexes were investigated.

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STUDIES ON ORGANOPHOSPHORUS COMPOUNDS 69.A NOVEL SYNTHESIS OF 5-SUBSTITUTED 3-(1'-DIETHOXYPHOSPHORYLALKYL)-2-ISOXAZOLINES

Chao Zhong LI, Dong Biao ZHOU, Cheng Ye YUAN

中国化学快报. 1993, 4(05): 391-392.

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Additions of diethyl phosphite to α-nitroalkenes followed by the introduction of trimethylchlorosilane and an activated alkene, gave the corresponding title compounds via regioselective 1,3-dipolar cycloaddition in moderate yield.

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STUDIES ON THE PRENYLFLAVONOIDS PART Ⅳ.SYNTHESIS OF (±) LESPEDEZAFLAVANONEE

Fang Jie ZHANG, Lian Yun ZHAO, Yu Lin LI

中国化学快报. 1993, 4(05): 393-394.

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(±)Lespedezaflavanone E, 6, 8, 3'-tri(γ,γ-dimethylallyl)-5, 7, 2', 4'-tetrahydroxy-flavanone, has been synthesized by the condensation of 3, 5-di(γ,γ-dimethylallyl)-4, 6-dimethoxymethoxy-2-hydroxyacetophenone and 2, 4-dimethoxymethoxy-3-(γ,γ-dimethylallyl)-benzaldehyde followed by cyclization and demethoxymethylation.

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A NEW APPROACH TO THE SYNTHESES OF THE PHEROMONES OF JAPANESE BEETLE AND BONTEBOK WITH (Z)-VINYL CUPRATES

Zhang Huang XU, YI Jun PAN, Jian Hong ZHAO, Yan LI

中国化学快报. 1993, 4(05): 395-398.

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The dl-form of the sex pheromone of Japanese beetle and the trail pheromone of Bontebok were synthesised in high purity of (Z)-olefinic configuration. The key step of the syntheses of compounds (1) and (2) involved stereospecific addition of n-alkyl cuprates to acetylene followed by addition of vinyl cuprates to aldehyde (7) and 3-buten-2-one.

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MULTIPLE SYNTHESIS OF SMALLPEPTIDE ANALOGS

De Xin WANG, Gui Shen LU

中国化学快报. 1993, 4(05): 399-402.

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Two peptide analogs H-Tyr-Thr-Pro-Arg-Lys-OH (1) and H-Tyr-Thr-Pro-Phe-Lys-OH (2) were prepared successfully by the technique of simultaneous multiple peptides synthesis(SMPS) on a single resin support. The profiles of HPLC and amino acid analysis indicated that the purity of 1 and 2 was satisfactory. The average yield (74.9%) of each peptide was reasonable. This new technique of SMPS offered significant savings not only in time but in many expensive reagents as well.

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THE REACTION OF SUBSTITUTED PHENOXY ACETYL CHLORIDE WITH TRIMETHYL PHOSPHITE

Ru Yu CHEN, Hui Ying LI, Bao Zhong CAI

中国化学快报. 1993, 4(05): 403-406.

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Substituted phenoxy acetyl chloride reacted with trimethyl phosphite to form an unexpected substituted phenoxy acetic acid ester, confirmed by ¹HNMR, IR and MS. The mechanism suggested is different from that of Arbuzov reaction.

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REDUCTION BY HYPOPHOSPHOROUS ACID IN ORGANIC SYNTHESIS

Xue WANG, Ye Di GUAN

中国化学快报. 1993, 4(05): 407-408.

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Hypophosphorous acid and its salt were found to serve as a new agent for selective reduction of α,β-unsaturated carbonyl compounds under mild reaction conditions.

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KINETIC STUDY ON PHOTOISOMERIZATION OF AN AZO-CONTAINING POLYMER AT THE AIR-WATER INTERFACE USING A IANGMUIR TROUGH

Yan Zhi REN, Wang LIU, Mang Lai GAO, Ying Ying ZHAO, Tie Jin LI

中国化学快报. 1993, 4(05): 409-410.

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Photoisomerization of a new polymer: monoesters of polymaleic acid containing naphthalene-azo-anthraquinone groups in side chains at the air-water interface of a Langmuir trough wan detected by recording the development of surface pressure with time. This process wan found to be a first-order reaction and complete within several minutes.

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HOW DO THE RATES OF HALOPHILIC ATTACKS COMPARE WITH THE RATES OF PROTOPHILIC ATTACKS?

Xing Ya LI, Ming Hu TU, Xi Kui JIANG

中国化学快报. 1993, 4(05): 411-414.

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The measured relative rates of halophilic and protophilic attacks (k_X/k_H) indicate that the rates of halophilic attacks are comparable in magnitude to those of protophilic attacks (deprotonations).

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HYDROGENATION OF GLEFINS CATALYZED BY POLYMER-BOUND METALLOPORPHYRIN

Rong Min WANG, Yan Pu WANG

中国化学快报. 1993, 4(05): 415-416.

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the catalytic activity of the polymer-bound palladium tetrakis (p-hydroxylphenyl) porphyrin complex (P-THPP-Pd) has been studied. It is found that the polymer catalyst has high selectivity in hydrogenation of olefins, and the rate of initial hydrogen uptake for methyl acrylate is 29.0 (ml H₂/min·g cat).

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OXIDATIVE COUPLING OF METHANE OVER Sr₂TiO₄ WITH K₂NiF₄ STRUCTURE

Wei Min YANG, Qi Jie YAN, Xian Cai FU

中国化学快报. 1993, 4(05): 417-420.

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Some K₂NiF₄-type oxides (A₂BO₄) exhibited good catalytic activity for oxidative coupling of methane to form ethane and ethylene. The C₂ selectivity was well correlated with A-site ion when B-site was Ti⁴⁺ ion.

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MCSCF STUDIES ON THE IRC AND REACTION RATE CONSTANTS FOR THE DEHYDROGENATION REACTION OF VINYL RADICAL

De Cai FANG, Xiao Yuan FU

中国化学快报. 1993, 4(05): 421-422.

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The transition state (TS) and Intrinsic Reaction Coordinate (IRC) for the titled reaction were traced by means of MCSCF/6-31G (210 configurations). The reaction activation energy of this reaction is 140.2KJ/mol. The reaction rate constants of five temperetures were calculated by CVT involving the tunneling effects.

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SQUAMOSTATIN-B,A NEW POLYKETIDE FROM ANNONA SQUAMOSA (ANNONACEAE)

Jing Guang YU, Xiu Zhen LUO, La SUN, Chun Yu LIU, Shao Liang HONG, Li Bin MA

中国化学快报. 1993, 4(05): 423-426.

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Squamostatin-B (1), a new polyketide or acetogenin, has been isolated from Annona squamosa L. (Annonaceae). Its structure and relative atereochemistry were elucidated on the basis of the spectral analyses of 1 and its derivatives, the acetate (2) and mesitoate (3).

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THE NMR CONFORMATIONAL STUDIES OF BACITRACIN A

Xiu Weng HAN, Jian Yi NI, Xi Jia MIAO, Jie Han HU, Jian ZHUANG, Guan Hong WENG, Xiao Mao ZHONG, Jun Den YANG, Xiang Peng DAI, Hong WANG, Chuan Ze SHEN

中国化学快报. 1993, 4(05): 427-430.

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Bacitracin consists of a mixture of several closely related polypeptide antibiotics produced from Bacillus licheniformis.The major component, Bacitracin A, is a cyclic dodecapeptide (Fig, 1), which has strong bacteriocidal effect on the G+ bacteria. The bacteriocidal activity requires the presence of divalent cations such as Zn²⁺, As we know, the biological function of ploypeptides and proteins are closely related to their three-dimensional structure.

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NMR STUDIES ON THE WEAK INTERACTION OF FOUR-MONONUCLEOTIDES WITH TRYPTAMIDE AND LEUCINAMIDE

Wen Qing WANG, Xiang DING, Jian JIANG, Guang Zhong TU, Li Bin MA, Shao Liang HONG

中国化学快报. 1993, 4(05): 431-434.

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NMR spectroscopy analysis was introduced to investigate the weak interaction of four 5'-mononucleotides with tryptamide and leucinamide. Assuming a 1:1 complex formation, the association constants were determined by nonlinear regression analysis. The association affinity of 4 mononucleotides with tryptamide decreased in the order: G > A > C > U, indicating that purine bases stack more strongly with tryptamide than pyrimidine bases. But with leucinamide the affinity decreases in the order: G > C > A=U, suggesting an amino acid-anticodonic preferential interaction. The implication of the present data to the origin of genetic code was briefly discussed.

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A RAPID FLUORIMETRIC DETERMINATION OF TYROSINE IN SERUM BY THE REACTION WITH CERIUM (Ⅳ)

Nian Qin JIE, Jing He YANG, Xue Fang LIU

中国化学快报. 1993, 4(05): 435-438.

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A fluorimetric method for the determination of tyrosine in serum was proposed. The fluoriscence intensity is a linear function of tyrosine content in the range 0-1.44ug/ml. The percentage of recovery was satisfactory.

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ANALYSIS OF PETROLEUM ACIDS IN DUSHANZI DISTILLATE

Jian ZHOU, Jia Lin TAO

中国化学快报. 1993, 4(05): 439-440.

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A method which involves conversion of carboxylic acids to corresponding hydrocarbons and determination of high-resoiution mass spectrometry has been applied to the analysis of petroleum acids in Dushanzi distillate and resulted in compound class identification of petroleum acids which have not been reported previously in Xinjiang petroleum.

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HOMOGENEOUS CATALYTIC REACTION(EC') AT GENERATION/COLLECTION MICROELECIRODE

Guang Li CHE, Shao Jun DONG

中国化学快报. 1993, 4(05): 441-444.

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A new type of macro-micro-macro triple electrode is fabricated. The kinetic equation is obtained by using the decrease in collection current to determine the kinetic constant of homogeneous catalytic reaction, the method can be used to study homogeneous chemical reaction with any magnitude of kinetic constant, and overcomes the disadvantages that the microelectrode is only suitable for fast catalytic reaction.

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SOLID STATE VOLTAMMETRY OF ELECTROACTIVE SOLUTES IN POLYMER SOLVENTS(PEO) AT MICROELECTRODE

Guang Li CHE, Shao Jun DONG

中国化学快报. 1993, 4(05): 445-448.

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The present paper describes experiments aimed at delineating significant chemical characteristics of electrochemical reactions in polymeric solutions, including how rigid solvent environments affect mass transport rates, and also discusses the possibility that the microelectrode coated with poly (ethylene oxide)(PEO) film can be used as gas sensor.

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A NEW SCHLIEREN TEXTURE IN NEMATIC STATE OF A THERMOTRORIC AROMATIC COPOLYRSTER

Wen Hui SONG, Shou Xi CHRN, Qi Feng ZHOU

中国化学快报. 1993, 4(05): 449-450.

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A schlieren texture with six dark brushes emanating from a point and a closed inversion wall have been observed under polarizing optical microscope in nematic state of a thermotropic aromatic copolyester, which have not been reported so far in the field of liquid crystalline polymers (LCPs).

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THE VIBRATIONAL RAMAN SPECTRA AND PHOTON-INDUCED OXIDATION PHENOMENA OF PURIFIED SOLID FILMS OF C₆₀

Xiao Ping XU, Jian WU, Ye Bin LI, Zhu De XU, Wen Zhu LI

中国化学快报. 1993, 4(05): 451-452.

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The vibrational Raman spectra have been obtained for purified solid films C₆₀. Three bands were observed out of the total of 10 that were theoretically predicted. Some phenomena which may be due to photon-induced oxidation in the vibrational Raman measuring were observed.

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¹H-²⁷Al CP/MAS NMR STUDIES OF DEALUMINATED HZSM-5 ZEOLITE

Feng DENG, You Ru DU, Kai Xuan WANG, Da Tong DING, Jing Zhong WANG, He Xuan Ll

中国化学快报. 1993, 4(05): 453-456.

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Recently introduced method of ¹H-²⁷Al CP/MAS was used to study the dealuminated HZSM-5 zeolite. The experimental result suggests that the resonance signal at ca. 30ppm is an independent signal (not part of a second-order quadrupolar lineshape), probably resulted from 5-coordinated non-framework aluminium (Al^NFP). The coincidence of the peaks of 4-coordinated framework (Al^F) and 4-coordinated non-framework (Al^NF) aluminium at 60ppm was confirmed by ²⁷Al MAS NMR after treating the dealuminated sample with acetylacetone (acac).

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RAMAN SPECTRA OF HYDROGEN ADSPECIES ON AMMONIA SYNTHESIS IRON CATALYST

Hong Bo CHEN, Yuan Yan LIAO, Hong Bin ZHANG, K. R. TSAI

中国化学快报. 1993, 4(05): 457-458.

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Raman peaks at 1951 and 2165 cm^-1 can be confirmed further by H₂/D₂ isotope exchange as H-adspecies on the doubly promoted iron catalyst for ammonia synthesis and are probably ascribed to two terminally adsorbed H-species.

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MECHANISM FOR THE EFFECTS OF MONO-VALENT CATIONS ON ²³Na NMR

Zhe ZHOU, Rong Juan CONG, Dong Hai LIN, Weng Xiu WANG, Qin Yi WU

中国化学快报. 1993, 4(05): 459-462.

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The effects of mono-valent cations, Li⁺, K⁺, Rb⁺, Cs⁺ and NH₄⁺, on ²³Na NMR were investigated. It was found that the chemical shifts for Na⁺ signal shifted downfield with the increase in the relative amounts of monovalent cations. It was suggested that mono-valent cations had competition coordination with Na⁺ for Dy (PPP) ₂^7-.

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INVESTIGATION OF BEHAVIOR OF AMMONIUM SULFATE ON SURFACE OF IRON OXIDE

Rong Sheng LI, Jing Feng CHEN, Hun YANG, Wu Yang ZHANG, Quan WEI

中国化学快报. 1993, 4(05): 463-466.

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When ammonium sulfate-iron oxide is treated below 573 K, ammonium sulfate can spontaneously desperse on the surface of iron oxide. Simultaneously ammonium sulfate decomposes to some extent. During or after the dispersion, sulfate ion can interact with Fe atom on the surface of iron oxide to form a sort of surface sulfato complex of Fe and thus is transformed from the isolated into the bidentately bound form. Above 573 K the sulfato complex of Fe will gradually decompose with a further increase in temperature.

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HALL EFFECT IN NIOBIUM DOPED YBa₂Cu₃O_7-y SUPERCONDUCTOR

Jian MENG, Yu Fang REN, Xiao Guang LI

中国化学快报. 1993, 4(05): 467-468.

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YBa₂Cu_3-xNb_xO_7-y superconductors have been prepared. XRD shows that the system remains orthorhombic for all composition. Substitution of Nb⁵⁺ for Cu²⁺ occurs in the Cu (2) sites. The introduction of the Nb⁵⁺ ions produces some extra free-electrons. These electrons recombine with the carriers of the system. It makes the mobility and the Hall number of YBa₂Cu_3-xNb_xO_7-y decrease and also result in a depression in Tc.

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THE CRYSTAL STRUCTURE OF [Co(TPPO)₄][Co(NCS)_aTPPO]₂

Da Yan SUN, De Hua JIANG, Yong Hui YANG, Jing Lan SHEN

中国化学快报. 1993, 4(05): 469-470.

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The title complex [Co(TPPO)₄] [Co(NCS)_aTPPO]₂ (TPPO=triphenylphosphine oside) was prepared by solvent evaporation method. Its crystal structure was determined by x-ray diffraction method. The crystal is rhombohedral with space group R3. The unit cell parameters are presented and the structure has been refined to a final R of 0.064.

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1993年, 第4卷, 第05期　刊出日期：1993-05-20

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1993年, 第4卷, 第05期 刊出日期：1993-05-20

1993年, 第4卷, 第05期　刊出日期：1993-05-20