SYNTHESES AND STRUCTURES OF POLYPHENYLSILSESQUIOXANES

Phenyltrichlorosilane was hydrolyzed both ifi. toluene and in ether from which two kinds of prepolymers were obtained with different structures, molecular weights, and molecular weight distributions. Polymers were prepared from the prepolymers in various polymerization conditions. The ladderlike, branched, and crosslinked structures formed under different polymerization conditions were characterized by means of FTIR, ~1H and ~(29)Si-NMR, and elemental analysis. Azeotropic distillation of solvents and H_2O formed during polymerization was found useful in removing H_2O from the system and high molecular weight products with perfect ladderlike structure were obtained.     

SYNTHESES AND CHARACTERIZATIONS OF HYPERBRANCHED POLYPHENYLENES

Hyperbranched polymers have attracted much attention over the past decade because of the expectation that theirunique molecular shape, branching pattern and surface functionality may impart unusual properties. Methods forthe synthesis of hyperbranched polymers are, however, rather limited. Cyclotrimerization of alkynes to aromaticrings is a century-old reaction. Although chemists have intensively investigated cyclotrimerization of variousdiynes in the last century, their attention was mainly f…     

SYNTHESES AND PROPERTIES OF POLYMERIZABLE METALLOPHTHALOCYANINE DERIVATIVES

Metallophthalocyanine derivatives with polymerizable vinyl groups were synthesized, characterized and polymerized. Preliminary results on their Langmuir-Blodgett (LB) film formation and the electronic properties of (Indium-Tin Oxide/LB-film/Al) Schottky devices were reported.     

SYNTHESES AND PROPERTIES OF SOME ORGANOSILANE POLYMERS

Some organosilane polymers with high molecular weights have been synthesized by cocondensztion of organosilicon dihalide monomers with sodium metal in toluene. These polymers are both soluble in common solvents and meltable at lower temperatures, and can be molded, cast into films or drawn into fibers. Exposure of the solid polymers to ultraviolet light leads to degradation or crosslinking.     

SYNTHESES AND PROPERTIES OF POLYPHENYL-1,2,4-TRIAZINES

A series of aromatic poly--1, 2, 4-triazines have been prepared. Experimental results showedthat these polymers exhibited good thermally oxidative stability as determined by isothermal agingat 30℃for 200 hours in air. After submerging the coated wire in boiling water for 240 hours nochange in electrical insulation was detected. Polymer films also showed good tensile strength (1050-1400 kg/cm~2) at room temperature. Therefore aromatic poly-1, 2, 4-triazines demonstrate highperformance showing good potential for use as functional and structural resins in the environmentsdemanding high thermal stability and hydrolytic stability.     

CONVENIENT AND EFFICIENT SYNTHESES OF β-KETO ESTERS AND β-KETO AMIDES DIRECTLY FROM α-ALKYLACETYL CHLORIDES

The α-alkylacetyl chlorides were slowly treated with dried triethylamine, followed by treatment with alcohols or amines, to produce β-keto esters or β-keto amides, respectively. The process is a convenient alternative to prepare β-keto esters and β-keto amides.     

SYNTHESES AND ANTIMICROBIAL ACTIVITY OF NOVEL POLYURETHANE IONOMERS

This study is concerned with the removal of Staph aureus from water by polyurethaneionomers. All the samples are quaternary ammonium salts which possess a positive chargeon the surface. The ratio of the soft segment to diisocyanate and chain extender is 1:2:1and the ionization degree is 100%. The ionomers strongly capture microbial cells on theirsurfaces in a living state and the hydrophilicity of polymer matrix used in the studyenhanced the affinity of the polymer for bacterial cells. The adhesion of the microorganismto polymer was due mainly to electrostatic interaction between them. The calculation ofthe viable cell count showed that D value for Staph.aureus is not proportional to the nitro-gen concentration. The microorganism capture ability of pyridinium-containing polymer isgreater than that of piperazine based samples.     

SYNTHESES AND SPECTRA OF HETEROPOLY BLUES OF DOUBLE 2:17 MOLYBDOPHOSPHATES LANTHANIDE COMPLEXES

The present paper reports eight heteropoty blues of double 2:17 motybdophosphates tanthanide comptexes with tacunary Dawson structure, i.e., K_(17)H_2[Ln(P_2Mo_2~ⅤMo_(15)~ⅥO_(16))_2], nH_2O and K_(17)H_4 [Ln(P_2Mo~Ⅴ_4Mo_(13)~ⅥO_(61))_2], nH_2O(Ln=La, Pr, Sm, Yb). They were characterized by etementat anatyses, potentiometric titration, IR, UV, potarography, cyclic vottammetry, X-ray photoelectron spectra, X-ray powder diffraction, thermat analyses and ESR. The results show that the properties of these heteropoty btues are different from those of heteropoty blues with saturated Dawson structure and other tacunary series. They are more stabte than their parent heteropoty acids in aqueous sotution and have the abitity of anti-base decomposition.     

SYNTHESES AND CHARACTERIZATION OF A NEW TYPE OF LIQUID CRYSTALLINE POLYESTERS

A new type of liquid crystalline polyesters with resorcin as one part of the mesogenic unitconnected together by polymethylene, or phenylene group, and lateral groups consisting of arigid azobenzene as another part of the mesogenic unit were synthesized by interfacialpolymerization of diacyl chlorides in 1, 2-dichloroethane and 2, 4-dihydroxy-4'-nitroazobenzen inaqueous alkaline solution. The polyester structures were confirmed by proton NMR and IRspectra. Their phase transition behavior and texture were studied by polarizing microscopy andDSC.     

SYNTHESES OF A NOVEL POLYFLUOROALKYL SUBSTITUTED 2-HYDROXYETHYL ACRYLATE AND ITS COPOLYMERS

Polyfluoroalkyl substituted 2-hydroxyethyl acrylate 6 was synthesized in six steps usingglycerol as a starting material. A preliminary investigation has been taken on the synthesisand characterization of copolymers of 6 and 2-hydroxyethyl methacrylate.     

STUDIES ON THE SYNTHESES AND BACTERICIDAL ACTIVITIES OF ACYLAMINOETHYL GLYCINES AND OF THEIR CYCLO-CONDENSATION PRODUCTS

Two series of new compounds:the aliphatic acylaminoethyl glycines (Ⅰ) and their cyclo-condensationproducts-allphatic acylaminoethyl plperazlnones (Ⅱ) were synthesized.The results of bactericidal and bacteriostatictests show that the two series of compounds are good bactericldal agents.     

THE STUDY OF THE SYNTHESES OF THE DERIVATIVES OF POLYPHENYLENE AND THEIR CONDUCTIVITY

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SYNTHESES AND CHARACTERIZATI0N OF Si-CONTAINING POLYESTER-POLYETHER MULTIBLOCK COPOLYMERS

A series of Si-containing polyester-polyether multiblock copolymers were synthesizedby transesterification and melt copolycondensation of organosilicon monomers [1, 1, 3, 3-tetramethyl-1, 3-bis (p-carbomethoxyphenyl) disiloxane] (I ) or dimethyl bis (p-carbometh-oxyphenyl) silane] (II) and dimethyl terephthalate (DMT), with 1, 4-butanediol, poly-tetramethylene glycol (PTMG) respectively. The organosilicon monomers were preparedby Grinard reaction, oxidation and esterification. The structures of the above monomers(I), (II) and the copolymers were characterized by MS anal. and ~1H-NMR.     

SYNTHESES AND SPECTROSCOPIC PROPERTIES OF PORPHYRIN-PHTHALOCYANINE MITH FLEXIBLE POLYATONIC CHAINS

The syntheses of porphyrin-phthalocyanine heterodimers with flexible polyatomic chains especially designed for the studies of intramolecular photoinduced processes are presented along with the effect of mutual orientation of the chromophore subunits on intramolecular energy transfer efficiency.     

SYNTHESES AND CRYSTAL STRUCTURES, REACTION OF α -THIOPI-COLIN-o-TOLUIDIDE AND ITS ORGANOTIN COMPLEX

<正> α-thiopicolin-o-toluidide and its organotin complex have been synthesized, and both crystal structures have been determined by X-ray analysis. The ligand:C13 H12N2S,Mr = 228. 3,monoclinic,P21/n,a=16. 387(1),b = 7. 752(2),c=18. 334(1) A ,β=95. 52(1),V = 2324. 8A3,Z = 8,DC=1. 305g·cm-3,F(000) = 960e. The final R= 0. 053 for 3291 observed unique reflections. There are two molecules in the asymmetric unit,which are confirmed to exist as the keto,cis-N configuration in the solid state. The complex:C17H21N2SClSn,Mr = 439. 6,orthorhombic,P212121,a = 8. 801(3),b = 9. 188 (2),c=24. 087(6) A,V=1947. 9A3,Z = 4,DC=1. 499g·cm-3,F(000) = 880e. The final R = 0. 041 for 1694 observed unique reflections. The tin atom is surrounded by an irregular (5 + 1) coordination geometry with five normal bonds and one weak bond [Sn....C1]. The molecules join each other through the weak bonds to form infinite polymeric chains parallel to the a axis. In addition, the possible reaction mechanism in coordination is discussed.     

SYNTHESES OF Ph AND TEMPERATURE－SENSITIVE HYDROGELS AND THEIR APPLICATIONS IN CONTROLLED RELEASE OF BIOMACROMOLECULES

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SYNTHESES OF HINDERED ALKYL PHOSPHONATES AND PHOSPHONIC & PHOSPHINIC ACIDS

A series of di-n-hexyl alkyl phosphonates with bulky substituent on phosphorus was synthesized by PTC P-alkylation using crown ether.Upon saponification of the resulting di-n-hexyl alkylphosphonates in the presence of crown ether or quaternary ammonium halide, corresponding mono-hexyl esters of alkyl phosphonic acids were prepared.Ultrasonic wave, as we found, can catalyze the reaction between dialkyl phosphite & metallic sodium and hydrolysis of dihexyl alkyl phosphonates.A series of di-t-alkyl phosphinic acids were synthesized by the reaction of Grignard reagent with PCl_3 followed by oxidation with 30% H_2O_2.It was found that the reaction between dibutyl phosphite and Grignard reagent of t-alkyl chloride is a new synthetic method for the preparation of mono-esters of highly hindered alkyl phosphonic acids.     

HYDROBORATION OF ALKYNES WITH DICHLOROBORANE-DIMETHYL SULFIDE——SYNTHESES AND SPECTROSCOPIC CHARACTERISTICS OF gem-DIBORON AND ALKENYLBORON COMPOUNDS

The reactions of alkynes with dichloroborane-dimethyl sulfide (HBCl_2·SMe_2) in the presence of boron trichtoride in pentane have been investigated.Both internal and terminal alkynes react with HBCl_2·SMe_2 in the molar ratio 1:2 at 0℃ to give dihydroborating products, gem-bis (dichloroboryl)alkanes, in good yield. Since the dihydroboration of alkynes is suppressed considerably at lower temperature, the internal alkynes and HBCl_2·SMe_2 react quantitatively in the molar ratio 1.4:1 at-20℃ or -30℃ to give the expected alkenyldichloroboranes.Under the same conditions,the terminal alkynes, however, undergo both monohydroboration and chloroboration.When terminal alkynes react with boron trichloride in the molar ratio 1 :1.1 in pentane, the chloroborating products, 2-chloro-1-alkenyldichloroboranes have been obtained in high yield.All dichloroboranes are readily converted by alcoholysis into the corresponding boronic esters.The resulting compounds have been characterized by IR, ~1H,~(11)B, and ~(13)C N     

ASYMMETRIC SYNTHESES OF STEREOTSOMERS OF SECODEMETHYLCLAUSENAMIDE

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