STUDIES ON THE SYNTHESIS OF BAIMUXINOL BY CATALYTIC HYDROGENATION OF DEHYDROBAIMUXINOL

Baimuxinol, a 4-hydroxymethyl agarofuran isolated from Aquilaria Sinensis, was synthsizd. The stereoselectivity of catalytic hydrogenation of dehydrobaimuxino and its derivatives was studied.     

THE UNUSUAL REDUCTION OF SOME AROMATIC ALDEHYDES BY SODIUM BOROHYDRIDE

Two aromatic aldehydes are found to be reduced by an unusual way by sodium borohydride in the presence of water to yield the corresponding methyl substituted aryl compounds.     

PREPARATION OF DI－GRIGNARD REAGENTS MEDIATED BY THE TRANSITION METAL CHLORIDES

ＰＲＥＰＡＲＡＴＩＯＮＯＦＤＩ－ＧＲＩＧＮＡＲＤＲＥＡＧＥＮＴＳＭＥＤＩＡＴＥＤＢＹＴＨＥＴＲＡＮＳＩＴＩＯＮＭＥＴＡＬＣＨＬＯＲＩＤＥＳＰＲＥＰＡＲＡＴＩＯＮＯＦＤＩ－ＧＲＩＧＮＡＲＤＲＥＡＧＥＮＴＳＭＥＤＩＡＴＥＤＢＹＴＨＥＴＲＡＮＳＩＴＩＯＮＭ...     

HIGHLY SELECTIVE CATALYTIC DIMERIZATION OF PHENYLACETYLENE BY CYCLOPENTADIENYL RUTHENIUM COMPLEXES

ＴｒａｎｓｉｔｉｏｎｍｅｔａｌｖｉｎｙｌｉｄｅｎｅｃｏｍｐｌｅｘｅｓＣ（ＭＣＨＲ）ｈａｖｅａｔｒａｃｔｅｄａｇｒｅａｔｄｅａｌｏｆａｔｅｎｔｉｏｎｉｎｒｅｃｅｎｔｙｅａｒｓａｓａｎｅｗｔｙｐｅｏｆｏｒｇａｎｏｍｅｔａｌｉｃｉｎｔｅｒｍｅｄｉａｔｅｓｔ...     

DIELS-ALDER REACTIONS CATALYZED BY MISCH-LANTHANIDE CHLORIDES

ＤＩＥＬＳ－ＡＬＤＥＲＲＥＡＣＴＩＯＮＳＣＡＴＡＬＹＺＥＤＢＹＭＩＳＣＨ－ＬＡＮＴＨＡＮＩＤＥＣＨＬＯＲＩＤＥＳ￥ＳｈｕＷｅｎＹＵ；ＳｈｉＪｉａｎＬＩＡＯａｎｄＤａｏＲｏｎｇＹＵ（ＤａｌｉａｎＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａｌＰｈｙｓｉｃｓ，Ｃｈ...     

A POLAROGRAPHIC CATALYTIC WAVE OF OXYGEN INDUCED BY DIPHENYLAMINE COMPOUNDS

It is reported in this paper a polarographic catalytic double wave of oxygen reductioncaused by diphenylamine compounds(diphs).The electrochemical process of the wave includes thepolarographic generation of the superoxide anion O_2~- and the dismutation of O_2~- catalyzed by diphswith redox pseudoreversibility.     

CATALYTIC ESTERIFICATION OF CARBOXYLIC ACIDS WITH ALCOHOLS BY SULFO-POLYVINYL CHLORIDE

Polyuinyl Chloride reacted with chlorosulfonic acid to form a polymer catalyst PVC-SO3H. This polymer catalyst was found to have high activity for esterification reaction between carboxylic acids and alcohols. This paper deals with the conditions in synthesis of n-butylacetate catalyzed with PVC-SO3H. The PVC-SO3H was used as a catalyst for preparing 11 esters of acetic acid, propiofnic acid and butyric acid with the yields of 82-92%.     

CATALYTIC PROPERTIES OF POLYMER-STABILIZED COLLOIDAL METAL NANOPARTICLES SYNTHESIZED BY MICROWAVE IRRADIATION

Catalytic properties of polymer-stabilized colloidal metal nanoparticles synthesized by microwave irradiation were studied in the selective hydrogenation of unsaturated aldehydes, o-chloronitrobenzene and the hydrogenation of alkenes. The results show that nanosized metal particles synthesized by microwave irradiation have similar catalytic performance in selective hydrogenation of unsaturated aldehydes, better selectivity to o-chloroaniline in hydrogenation of o-chloronitrobenzene and higher catalytic activities in hydrogenation of alkenes, compared with metal clusters prepared by conventional heating. The same apparent activation energy (Ea = 29 kJ mol^-1) for hydrogenation of 1-heptene catalyzed with platinum nanoparticles prepared by both heating modes implied that the reaction followed the same mechanism.     

DETERMINATION OF PROTEIN USING CATALYTIC COLORIMETRY OF SULFANILIC ACID BY COBALT（Ⅱ）

ＤＥＴＥＲＭＩＮＡＴＩＯＮＯＦＰＲＯＴＥＩＮＵＳＩＮＧＣＡＴＡＬＹＴＩＣＣＯＬＯＲＩＭＥＴＲＹＯＦＳＵＬＦＡＮＩＬＩＣＡＣＩＤＢＹＣＯＢＡＬＴ（Ⅱ）￥ＹｕｎＸｉａｎｇＣＩ；ＸｉａｏＤａＹＡＮＧａｎｄＸｉａｏＴｉｎｇＴＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＣ...     

SYNTHESIS AND CATALYTIC PROPERTIES OF LAYERED DOUBLE HYDROXIDES PILLARED BY HETEROPOLYOXOMETALATE

ＳＹＮＴＨＥＳＩＳＡＮＤＣＡＴＡＬＹＴＩＣＰＲＯＰＥＲＴＩＥＳＯＦＬＡＹＥＲＥＤＤＯＵＢＬＥＨＹＤＲＯＸＩＤＥＳＰＩＬＬＡＲＥＤＢＹＨＥＴＥＲＯＰＯＬＹＯＸＯＭＥＴＡＬＡＴＥ￥ＺｈｅｎｇＸＵ；ＨｅＭｉｎｇＨＥ；ＤｏｎｇＭｅｉＺＨＯＵ；ＬｉｎｇＳｈｅｎ...     

CATALYTIC BEHAVIOR OF HYDROTALCITE-LIKE COMPOUND IN NITROGEN MONOXIDE REDUCTION BY CO

ＣＡＴＡＬＹＴＩＣＢＥＨＡＶＩＯＲＯＦＨＹＤＲＯＴＡＬＣＩＴＥＬＩＫＥＣＯＭＰＯＵＮＤＩＮＮＩＴＲＯＧＥＮＭＯＮＯＸＩＤＥＲＥＤＵＣＴＩＯＮＢＹＣＯＷａｎｇＸｕｅｚｈｏｎｇ１，ＬｉｕＹｕｍｉｎ２，ＷｕＹｕｅ１（１ＣｈａｎｇｃｈｕｎＩｎｓｔｉｔｕｔ...     

QUANTITATIVE EXPLANATION ON STRUCTURE-CARCINOGENIC ACTIVITY RELATIONSHIP OF AROMATIC AMINES BY DI-REGION THEORY

Di-region theory, the theory for the mechanism of carcinogenesis, has been extendedsuccessfully on the quantitative Structure-carcinogenic activity relationship (QSCAR) of 63aromatic amines. A quantitative equation for the QSCAR of aromatic amines has been estab-lished by the mechanism conception of the specialized di- functional alkylation between thenitrenium ion of the amino group and the epoxide of the aromatic ring. The agreementbetween calculation and experiment comes up to 98%. Thus, it can now express the puzzlingvariation of the carcinogenicity of aromatic amines, as a comprehensible structure-chemicalreactivity relationship.     

THE REACTION OF AROMATIC ALDEHYDES WITH p-NITROBENZYLLIBUTYLTELLURONIUM BROMIDE BY PHASE TRANSFER CATALYSIS

Under the condition of solid-liquid phase transfer catalysis,olefins were obtained by the reaction of p-nitrobenzyldibutyltelluroniumbromide with aromatic aldehyde.Under the condition of liquid-liquid phasetransfer catalysis,however,different products were obtained due to thereactivity of different bases or aldehydes.     

CATALYTIC ESTERIFICATION OF CARBOXYLIC ACIDS WITH ALCOHOLS BY SULFO—POLYVINYL CHLORIDE

Polyvinyl Chloride reacted with chlorosulfonic acid to from a polymer catalyst PVC-SO3H.This polymer catalyst was found to have high activity for resterification reaction between carboxylic acids and alcohols.This paper deals with the conditions in synthesis of n-butlyacetate catalyzed with PVC-SO3H.The PVC-SO3H was used as a catalyst for preparing 11 esters of acetic acid,propionic acid and butyric acid with the yields of 82-92%.     

CATALYTIC HYDROGENATION OF FULLERENE

ＣＡＴＡＬＹＴＩＣ　ＨＹＤＲＯＧＥＮＡＴＩＯＮ　ＯＦ　ＦＵＬＬＥＲＥＮＥＣＡＴＡＬＹＴＩＣＨＹＤＲＯＧＥＮＡＴＩＯＮＯＦＦＵＬＬＥＲＥＮＥ￥ＧｕｏＸｉａｏＤＯＮＧ；ＪｉｅＪｕｎＷＡＮＧ；ＪｉＳｈｅｕｇＬＩ（ＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｓｔｒｙ，Ａ...     

STUDIES ON THE KINETICS OF VINYL PHOTOPOLYMERIZATION INITIATED BY CONDENSED AROMATIC HYDROCARBON-ANILINE SYSTEMS

The photopolymerization of acrylonitrile and methyl methacrylate initiated by condensed aro-matic hydrocarbon-aniline systenis was studied at 25℃under irradiation of 365 nm wavelengthlight. From kinetic data the monomer exponent has been measured to be 1.1. Within the concen-tration of 10~(-4)--10~(-3)M, the aromatic hydrocarbon exponents changrd from 0.30 to 0.40, depedingon the values of molar extinction coefficient of the hydrocarbons at 365 nm (ε_(365)). The greater theε_(365), the Iower the exponents. The aniline exponents were measured to be in the range of 0.30--0.45. The aromatic hydrocarbon-aniline systems with the lower aniline exponent showed a lower ratioof the fiuorescence quenching of the hydrocarbon by aniline and by the monomer.     

STUDIES ON THE MECHANISM OF VINYL PHOTOPOLYMERIZATION INITIATED BY CONDENSED AROMATIC HYDROCARBON-ANILINE SYSTEMS

Initiation mechanism of the photopolymerization of acrylonitrile and methyl methacrylate, usingbinary condensed aromatic hydrocarbon (CAH)-aniline systems as initiator, was studied. The strongerthe electron-donating ability of the aniline derivatives, the faster the the of photopolymerizationwill be. The radical intermediates produced by photoreaction between anthracene and anilinewere detected with ESR spectra. The initiation scheme involves the formation of exciplex betweenthe excited singlet state of CAH and the ground state of aniline as the first step, and then followedby proton transfer, leading to the generation of two kinds of radicals. From the end-group analysisof the polymers obtained, it is suggested that both kinds of radicals are involved in the initiation.     

CATALYTIC ACTIVITY OF Pd-Sn COMPLEX CARBONYLATION OF ACETYLENE

The influence of different concentration of HO, SnCl2, Cl- and n-BuOH on the carbonylation of acetylene has been studied. The results show that the yield of n- butyl propionate increases with the increase of HC1 concentration and the catalytic activity is depressed when Cl" concentration increases. However, the stability of catalytic complex is promoted by Cl-. The key to the carbonylation of acetylene lies in the addition of SnCl2, which promotes the formation of the complex of C2H2, CO with catalyst and plays an important role in the hydrogen removal from n-BuOH. The hydrogen removed from n BuOH is the hydrogen source of this reaction. Meanwhile, the principle of the effect of HCl, Cl- and SnCl2 on reaction has been discussed. The reaction model has also been proposed.     

MORPHOLOGY OF A THERMOTROPIC AROMATIC POLYESTER

The crystalline morphology of a thermotropic aromatic polyester has been studied by microscopy techniques. Spherulites with ringed structure under polarizing micioscope were observed for solution cast specimens, They were composed of radially growing crystalline lamellae of thickness around 100. It was found that the molecules were packed in the thickness direction. Banded texture was observed in randomly packed domains for melt cast specimens. The bands have the same width and internal structure as those usually observed in oriented specimens of these polymers obtained by shearing their mesomorphic melt.     

KINETICS OF MESOPHASE FORMATION OF A LYOTROPIC AROMATIC POLYAMIDE

The kinetics of mesophase formation of a lyotropic aromatic polyamide from isotropic state has been studied by means of depolarized light intensity. Avrami type analysis of the data gives an exponent close to 1, which suggests the nucleation followed by one-dimensional growth. No influence of blending flexible chain from nylon 6 to the aromatic polyamide on the kinetics of mesophase formation was observed.