Synthesis of soluble polyarylenes containing alternating 4,4′-(1,1′-binaphthyl) and 4,4′-(3,3′-diphenyl)biphenyl structural units

Summary The synthesis and Ni(0) catalyzed homocoupling polymerization of 4,4-bis[5-(trifluoromethanesulfonyloxy)-2-biphenylyl]-1, 1-binaphthyl (9) are described. This polymerization reaction produces a soluble polyarylene containing alternating 4,4-(1,1-binaphthyl) and 4,4-(3,3-diphenyl)biphenyl structural units.     

Coordination of cobalt(III), nickel(II), copper(II), palladium(II) and platinum(II) with N-ethyl-N′-(4′-methylthiazol-2′-yl)thiourea (HL)

Coordination complexes of formula [ML₂], [CoL₃], [Pd(HL)Cl₂], [CuLCl(H₂O)] and [CuL₂(H₂O)₂] {L=anion of N-ethyl-N^′-(4^′-methylthiazol-2′-yl)thiourea; M=Pt^II, Pd^II or Ni^II} were prepared and characterized by elemental analyses, magnetic susceptibilities, and by IR, NMR, electronic and mass spectral measurements.     

4,4′-(4,4′-砜基二苯氧基)二苯甲酰氯(SODBC)的合成

以对甲基苯酚、4,4′-二氯二苯砜为原料,通过亲核取代反应合成了4,4′-二(4-甲基苯氧基)二苯砜,用高锰酸钾将甲基氧化得到4,4′-(4,4′-砜基二苯氧基)二苯甲酸(SODBA),后者在二氯亚砜和路易斯碱的催化下合成了4,4′-(4,4′-砜基二苯氧基)二苯甲酰氯(SODBC)白色固体.用FT-IR、1H-NMR、13C-NMR、DSC等对其进行了表征,实验证明该化合物具有预期的结构和较高的纯度.     

4,4′-二苯基甲烷二异氰酸酯(MDI)

生产现状:MDI是聚氨酯的主要原料之一,由于受世界性建筑优势的推动和纯MDI基料新用途的出现,MDI牛产获得了迅速发展。1987年世界生产能力为103.4万吨,其中北美40.5万吨、欧洲45.8万吨、亚洲10.9万吨、南美和东欧6.2万吨。1980年世界MDI产量为56.5万吨,1985年达86.6万吨,1980～1985     

炭92′论文题目(续2)

E15对氯化氰在W五e tlerite炭上分解的表面及气相 研究 N。5 .Melntyre等(够1)E17用气相生长带状石墨丝制备带有序尺寸和显微 结构的超细片状石墨 H。Murayama等(535)E一18用夹入硅酸盐或硅酸铝中把的芳香按正离子 合成石墨 B。Maitnoun等‘(538)P一E4催化剂引晶技术对气相生长炭纤雄形成的 影响 T。Kato等(541)P一ES用硝酸和氨改进活性炭 R。J。J。Jansen(544)P一E7热解炭涂层的烧损性质 E。W inkler等(547)P一ES若干沉积参数对热解炭电阻率的影响 W。Kant等临50)P一Eg甲烷热分解期间热解炭在镍粉和钻粉上的 生成 A .E.Kuguc…     

The electrochemical properties of polyaniline derivatives: poly(4,4′-diphenylamine methylenes) and poly(4,4′-diphenylimine methines)

Summary The electrochemical properties of poly(4,4-diphenylamine methylenes) and poly(4,4-diphenylimine methines) were investigated by cyclic voltammetry. A dehydrogenation reaction occured when poly(4,4-diphenylamine methylenes) underwent a electrochemical reaction and transformed to poly(4,4-diphenylimine methines). The fully oxidized poly(4,4-diphenylimine methines) had the electrochemical band gaps of 1.60–1.72 eV, which were found to significantly smaller than those of the fully reduced poly(4,4-diphenylamine methylenes).     

4,4′-双(4′-羟苯基)戊酸合成的研究

研究了以乙酰丙酸(LA)和苯酚为原料,盐酸为催化剂,巯基乙酸为助催化剂合成4,4’-双(4’-羟苯基)戊酸的工艺。考察了助催化剂种类及用量、反应物料配比、反应温度、反应时间和催化剂用量等因素的影响。通过正交试验,优化了合成工艺。试验表明:n(苯酚)∶n(LA)(摩尔比)=4∶1,反应温度60℃,反应时间为45 h,n(HCl)∶n(LA)=4∶1时,最高产率为97.1%。产物结构经红光外光谱、氢核磁谱进行了表征确定为4,4’-双(4’-羟苯基)戊酸。     

第十届国际化学工程大会(CHISA′90)和第七届国际干燥会议(IDS′90)

CHISA是捷克语中“化学工程、化工装备设计与自动化”的简写,从1962年起每三年举行一次,地点均在捷克。该大会现己成为世界性的最重要和规模最大的化学工程大会之一。本届大会参加者来自51个国家和地区,共1600余人。会议共提交论文1400     

Non-isothermal degradation kinetics of poly (2,2′-dihydroxybiphenyl)

Catalytic oxidative polymerization of 2,2′-dihydroxybiphenyl (DHBP) was performed by using Schiff base polymer-Cu (II) complex and hydrogen peroxide as catalyst and oxidant, respectively. According to size exclusion chromatography (SEC) analysis, the number-average molecular weight (M _n), weight-average molecular weight (M _w) and polydispersity index (PDI) values of poly (2,2′-dihydroxybiphenyl) (PDHBP) were found to be 37,500, 90,000 g mol⁻¹ and 2.4, respectively. The thermal degradation kinetics was investigated by thermogravimetric analysis in dynamic nitrogen atmosphere at four different heating rates: 5, 10, 15 and 20 °C min⁻¹. The derivative thermogravimetry curves of PDHBP showed that its thermal degradation process had one weight-loss step. The apparent activation energies of thermal decomposition for PDHBP as determined by Tang, Flynn–Wall–Ozawa (FWO), Kissenger–Akahira–Sunose (KAS), Coats–Redfern (CR) and Invariant kinetic parameter (IKP) methods were 109.1, 109.0, 110.0, 108.4 and 109.8 kJ mol⁻¹, respectively. The mechanism function and pre-exponential factor were determined by master plots and Criado–Malek–Ortega method. The most likely decomposition process was a D _n Deceleration type in terms of the CR, master plots and Criado–Malek–Ortega results.     

1,3-二(3′-溴苯基)-5-(4′-氯苯基)苯的合成

以苯乙酮、溴素为原料 ,无水三氯化铝为催化剂 ,按n (苯乙酮 )∶n (溴素 )∶n (AlCl3) =1.8∶2 .3∶4.2制得间溴苯乙酮 ,产率为 6 5 % ;间溴苯乙酮与催化剂四氯化硅按n(间溴苯乙酮 )∶n(四氯化硅 ) =1∶1在无水乙醇中经缩合反应制得 1,3 二 (3′ 溴苯基 )丁烯 2 酮 1(A) ,产率为5 2 % ,以此为中间体与对氯苯乙酮在四氯化硅催化下按n(A)∶n (对氯苯乙酮 )∶n (四氯化硅 )=1.0∶1.0∶2 .5经缩合反应 ,合成了 1,3 二 (3′ 溴苯基 ) 5 (4′ 氯苯基 )苯 (B) ,产率为 43%。     

Two-dimensional cobalt-bipyridinedicarboxylate coordination polymer: [Co(2,2′-bipyridine-5,5′-dicarboxylato) (H2O)]·(H2O)

Hydrothermal reaction between cobalt(II) nitrate and 2,2^′-bipyridine-5,5^′-dicarboxylic acid in the presence of NaOAc gave a two-dimensional coordination-polymer of cobalt(II), [Co(2,2^′-bipyridine-5,5^′-dicarboxylato)(H₂O)]·(H₂O) (1). X-ray structure determination showed that compound 1 has a two-dimensional infinite network based on cobalt-bipyridinedicarboxylate building blocks and has a relatively small channel of 5.0×6.6 Å.     

4′-(Oxodiphenylphosphino)-2,2′:6′,2′′-terpyridine – crystal structure and complexes of cobalt(II) and cobalt(III)

The complex [Co(2)₂]²⁺ (2 = 4^′-(oxodiphenylphosphino)-2,2^′:6^′,2^′′-terpyridine) has been prepared either by the direct reaction of 2 with Co(II) or by careful oxidation of [Co(1)₂]²⁺(1 = 4^′-(diphenylphosphino)-2,2^′:6^′,2^′′-terpyridine). Further oxidation with H₂O₂ leads to [Co(2)₂]³⁺. The ¹H NMR spectra of the paramagnetic and diamagnetic [Co(2)₂]²⁺ and [Co(2)₂]³⁺ are reported. The crystal structure of ligand 1 has been determined; in the solid-state, 1 exhibits extensive intermolecular π–π stacking.     

Ion exchange and charge transport properties of polymeric tris(4-vinyl-4′-methyl-2,2′-bipyridine) ruthenium(II) films

Multiply charged electroactive anions [IrCl ₆ ^2? , Fe(CN) ₆ ^3? , and W(CN) ₈ ^4? ] are electrostatically incorporated in polymeric films of tris(4-vinyl-4′-methyl-2,2′-bipyridine) ruthenium(II) [poly-Ru(vbpy) ₃ ²⁺ ] from aqueous trifluoroacetate solution. Values of apparent diffusion coefficients (D _ct) and heterogenous electron transfer rates (k _et) are measured for these anions as a function of their relative concentration (Γ _M/Γ _Ru) in the film.D _ct andk _et decrease systematically asΓ _M/Γ _Ru increases in a manner that is independent of charge and chemical identity of the ion. This result suggests that a nonchemical process, presumably electrostatic cross-linking, limits diffusional motion and is responsible for the decrease inD _ct andk _et with increasing anion content. Protonated polyvinyl-pyridine films exhibit similar ranges and variations inD _ct andk _et, which suggest similar structures and mechanisms of charge transport for these films and poly-Ru(vbpy) ₃ ²⁺ .     

Entry to alkynylplatinum(IV) chemistry using hypervalent iodine(III) reagents,and the synthesis of triphenyl{4,4′-bis(tert-butyl)-2,2′-bipyridine}iodoplatinum(IV)

The reaction of phenyl(alkynyl)iodine(III) triflates with diorganoplatinum(II) complexes provides a general route for the synthesis of a new class of alkynylplatinum(IV) complexes containing Pt^IVR₂(CCR²) groups, e.g., the 4,4^′-bis(tert-butyl)-2,2^′-bipyridine complexes PtIR₂(CCSiMe₃)(Bu^t₂bpy) (R=Me, Ph); IPh₂(OTf) reacts with PtPh₂(Bu^t₂bpy) to form the first archetypal triarylplatinum(IV) complex PtIPh₃(Bu^t₂bpy).     

Carbonyl and chloro complexes of ruthenium(II) containing 3,3′-diester-2,2′-bipyridyl ligands

A series of 3,3′-dialkoxycarbonyl-2,2′-bipyridines (alkyl=Me, Et, i-Pr, i-Bu) has been prepared in good yield from 1,10-phenanthroline. The synthesis and characterization of the corresponding trans-(Cl)-Ru(L)(CO)₂Cl₂ and cis-Ru(L)₂Cl₂ complexes are described.     

4,4′-双(氯甲基)联苯的合成

本文以联苯、多聚甲醛为原料，氯化锌作催化剂，经氯甲基化反应合成了４，４′－双（氯甲基）联苯，并对其反应条件进行了研究。     

N,N′-乙撑双(硬脂酰胺)

分了C:7H。。一e一NH一CH:CH:一NH一C一Ci:Ha。 C:.H,eN,O: 分子量593 l英文名IN,N‘一Ethylene bis(s-tearanl记e) l国外商品名1 Chemetronwa、一100(Chemetron);Armowax EBS(Armak)书H佣ehst WaxC(Hoechst);AerawaxC(Glyeo),Kemam溉w 20(枷mko);Lubro/EA(ICI)。 l性状】白色至淡黄色粉末或粒状物。熔点130一145℃,闪点约285℃,比重0.98。不溶于水,常温下不溶于乙醇、丙酮等大多数溶剂,可溶于混合二甲苯、菇烯、丁醇、甲基溶纤素及大多数氯代烃类。游离脂肪酸含量低于4%,水份低于。.5%。 【制法】乙撑双硬脂酞胺的制备是…     

A heterobimetallic copper(I)–silver(I) complex spanned by 4,4′-bipyridine

Cationic heterobimetallic {[P(C₆H₄CH₂NMe₂-2)₃]Ag-bipy-Cu[P(C₆H₄CH₂NMe₂-2)₃]}²⁺(OTf⁻,PF₆⁻) (5) (bipy = 4,4^′-bipyridine, OTf=OSO₂CF₃) is accessible by the subsequent reaction of [P(C₆H₄CH₂NMe₂-2)₃]AgOTf (1) with bipy (2) to afford {[P(C₆H₄CH₂NMe₂-2)₃]Ag(bipy)}⁺(OTf⁻) (3), which on treatment with equimolar amounts of {[P(C₆H₄CH₂NMe₂-2)₃]Cu}⁺(PF₆⁻) (4) produces 5. In 5 the respective group-11 metal(I) centres are bridged by the π-conjugated organic ligand bipy. The electrochemical behaviour of 5 is reported.