1993 Volume 4 Issue 5

THE REGIOSELECTIVE SYNTHESIS OF NOVEL PHENYLSULFONES BEARING ISOPRENE UNITS
He Sheng ZHANG , Jia Wei CHEN , Li JIN
1993, 4(5): 377-378
[Abstract](50) [FullText HTML] [PDF 72KB](0)
Abstract:
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.
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
1993, 4(5): 379-380
[Abstract](66) [FullText HTML] [PDF 62KB](3)
Abstract:
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.
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
1993, 4(5): 381-384
[Abstract](73) [FullText HTML] [PDF 103KB](0)
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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%.
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
1993, 4(5): 385-386
[Abstract](52) [FullText HTML] [PDF 101KB](0)
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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.
SYNTHESIS AND PROPERTIES OF NEW INTERPOLYMERIC COMPLEXES
Shu Mei DENG , Jing LIN , Xu ZHANG
1993, 4(5): 387-390
[Abstract](54) [FullText HTML] [PDF 97KB](0)
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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.
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
1993, 4(5): 391-392
[Abstract](51) [FullText HTML] [PDF 80KB](0)
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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.
STUDIES ON THE PRENYLFLAVONOIDS PART Ⅳ.SYNTHESIS OF (±) LESPEDEZAFLAVANONEE
Fang Jie ZHANG , Lian Yun ZHAO , Yu Lin LI
1993, 4(5): 393-394
[Abstract](55) [FullText HTML] [PDF 68KB](0)
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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.
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
1993, 4(5): 395-398
[Abstract](58) [FullText HTML] [PDF 103KB](0)
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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.
MULTIPLE SYNTHESIS OF SMALLPEPTIDE ANALOGS
De Xin WANG , Gui Shen LU
1993, 4(5): 399-402
[Abstract](54) [FullText HTML] [PDF 135KB](0)
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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.
THE REACTION OF SUBSTITUTED PHENOXY ACETYL CHLORIDE WITH TRIMETHYL PHOSPHITE
Ru Yu CHEN , Hui Ying LI , Bao Zhong CAI
1993, 4(5): 403-406
[Abstract](71) [FullText HTML] [PDF 141KB](1)
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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.
REDUCTION BY HYPOPHOSPHOROUS ACID IN ORGANIC SYNTHESIS
Xue WANG , Ye Di GUAN
1993, 4(5): 407-408
[Abstract](54) [FullText HTML] [PDF 72KB](0)
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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.
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
1993, 4(5): 409-410
[Abstract](57) [FullText HTML] [PDF 59KB](0)
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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.
HOW DO THE RATES OF HALOPHILIC ATTACKS COMPARE WITH THE RATES OF PROTOPHILIC ATTACKS?
Xing Ya LI , Ming Hu TU , Xi Kui JIANG
1993, 4(5): 411-414
[Abstract](58) [FullText HTML] [PDF 132KB](0)
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The measured relative rates of halophilic and protophilic attacks (kX/kH) indicate that the rates of halophilic attacks are comparable in magnitude to those of protophilic attacks (deprotonations).
HYDROGENATION OF GLEFINS CATALYZED BY POLYMER-BOUND METALLOPORPHYRIN
Rong Min WANG , Yan Pu WANG
1993, 4(5): 415-416
[Abstract](53) [FullText HTML] [PDF 64KB](0)
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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).
OXIDATIVE COUPLING OF METHANE OVER Sr2TiO4 WITH K2NiF4 STRUCTURE
Wei Min YANG , Qi Jie YAN , Xian Cai FU
1993, 4(5): 417-420
[Abstract](53) [FullText HTML] [PDF 109KB](0)
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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.
MCSCF STUDIES ON THE IRC AND REACTION RATE CONSTANTS FOR THE DEHYDROGENATION REACTION OF VINYL RADICAL
De Cai FANG , Xiao Yuan FU
1993, 4(5): 421-422
[Abstract](59) [FullText HTML] [PDF 67KB](0)
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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.
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
1993, 4(5): 423-426
[Abstract](65) [FullText HTML] [PDF 141KB](0)
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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).
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
1993, 4(5): 427-430
[Abstract](53) [FullText HTML] [PDF 148KB](0)
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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.
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
1993, 4(5): 431-434
[Abstract](57) [FullText HTML] [PDF 133KB](0)
Abstract:
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.
A RAPID FLUORIMETRIC DETERMINATION OF TYROSINE IN SERUM BY THE REACTION WITH CERIUM (Ⅳ)
Nian Qin JIE , Jing He YANG , Xue Fang LIU
1993, 4(5): 435-438
[Abstract](50) [FullText HTML] [PDF 88KB](0)
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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.
ANALYSIS OF PETROLEUM ACIDS IN DUSHANZI DISTILLATE
Jian ZHOU , Jia Lin TAO
1993, 4(5): 439-440
[Abstract](57) [FullText HTML] [PDF 73KB](0)
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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.
HOMOGENEOUS CATALYTIC REACTION(EC') AT GENERATION/COLLECTION MICROELECIRODE
Guang Li CHE , Shao Jun DONG
1993, 4(5): 441-444
[Abstract](59) [FullText HTML] [PDF 139KB](0)
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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.
SOLID STATE VOLTAMMETRY OF ELECTROACTIVE SOLUTES IN POLYMER SOLVENTS(PEO) AT MICROELECTRODE
Guang Li CHE , Shao Jun DONG
1993, 4(5): 445-448
[Abstract](49) [FullText HTML] [PDF 160KB](0)
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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.
A NEW SCHLIEREN TEXTURE IN NEMATIC STATE OF A THERMOTRORIC AROMATIC COPOLYRSTER
Wen Hui SONG , Shou Xi CHRN , Qi Feng ZHOU
1993, 4(5): 449-450
[Abstract](59) [FullText HTML] [PDF 238KB](0)
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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).
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
1993, 4(5): 451-452
[Abstract](50) [FullText HTML] [PDF 69KB](0)
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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.
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
1993, 4(5): 453-456
[Abstract](47) [FullText HTML] [PDF 130KB](0)
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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 (AlNFP). The coincidence of the peaks of 4-coordinated framework (AlF) and 4-coordinated non-framework (AlNF) aluminium at 60ppm was confirmed by 27Al MAS NMR after treating the dealuminated sample with acetylacetone (acac).
RAMAN SPECTRA OF HYDROGEN ADSPECIES ON AMMONIA SYNTHESIS IRON CATALYST
Hong Bo CHEN , Yuan Yan LIAO , Hong Bin ZHANG , K. R. TSAI
1993, 4(5): 457-458
[Abstract](59) [FullText HTML] [PDF 88KB](0)
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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.
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
1993, 4(5): 459-462
[Abstract](56) [FullText HTML] [PDF 108KB](0)
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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) 27-.
INVESTIGATION OF BEHAVIOR OF AMMONIUM SULFATE ON SURFACE OF IRON OXIDE
Rong Sheng LI , Jing Feng CHEN , Hun YANG , Wu Yang ZHANG , Quan WEI
1993, 4(5): 463-466
[Abstract](63) [FullText HTML] [PDF 140KB](0)
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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.
HALL EFFECT IN NIOBIUM DOPED YBa2Cu3O7-y SUPERCONDUCTOR
Jian MENG , Yu Fang REN , Xiao Guang LI
1993, 4(5): 467-468
[Abstract](54) [FullText HTML] [PDF 122KB](0)
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YBa2Cu3-xNbxO7-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 YBa2Cu3-xNbxO7-y decrease and also result in a depression in Tc.
THE CRYSTAL STRUCTURE OF [Co(TPPO)4][Co(NCS)aTPPO]2
Da Yan SUN , De Hua JIANG , Yong Hui YANG , Jing Lan SHEN
1993, 4(5): 469-470
[Abstract](47) [FullText HTML] [PDF 75KB](0)
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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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