An investigation of the efficacy of organotin compounds for the control of the cotton stainer,Dysdercus cingulatus,the mosquito,Anophelese stephensi,and the common house fly,Musca domestica

A series of commercial organotin compounds was screened for efficacy against the three insect species Dysdercus cingulatus (cotton stainer), Anophelese stephensi (mosquito) and Musca domestica (house fly). Tributyltin species in the general order Bu₃SnCl>(Bu₃Sn)₂O>Bu₃Sn(linoleate) were more effective than two triphenyltin compounds. Tricyclohexyltin hydroxide, dimethyltin chloride, phenyltin trichloride and a diethyltin dichloridephenanthroline adduct were less effective.     

Comparative study of the biological activity of organosilicon and organogermanium compounds

The literature data and the results of our own investigations on the comparative study of the biological activity of isostructural organogermanium and organosilicon compounds have been summarized. It has been shown that the series of organogermanium and organosilicon compounds is more active than the carbon analogues, the majority of organogermanium compounds are less toxic than the sila analogues, the biological activity of the compounds under study appears to be similar but can dramatically differ in the degree of activity, and, moreover, in some particular cases sila and germa analogues exhibit the opposite biological effects.     

The mixing properties of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) cyclotrisiloxane with various organosilicon compounds at different temperatures

The density and refractive index were determined for four binary mixtures of 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl) cyclotrisiloxane with octamethyl-cyclotetrasiloxane, hexamethyldisiloxane, 2,4,6,8-tetramethyl-cyclotetrasiloxane and 2,4,6,8-tetramethyl-2,4,6,8-tetraethenylcyclotetrasiloxane at different temperatures T = (308.15, 313.15, 318.15, 323.15 and 328.15) K and atmospheric pressure using a DMA4500/RXA170 combined system. The excess molar volume, partial excess volume at infinite dilution, isobaric coefficient of thermal expansion, excess refraction indices, Lorentz–Lorenz molar refraction and the deviation in molar refraction have been calculated using this data. The results have been incorporated into the Redlich–Kister equation and used to estimate the binary interaction parameters and standard deviation. The values of partial excess volume at infinite dilution and excess refraction indices for the four binary systems at different temperatures were calculated using the adjustable parameters of the Redlich–Kister smoothing equation. The factors that affect these excess quantities are discussed.     

Organoelement compounds in the electrochemical synthesis of fluoroorganics

Electrochemical generation of organic anion-radicals in the presence of fluoroorganosilanes causes the chain addition reaction. Adducts of CFCl₂SiMe₃, CFClCFSiMe₃ and CF₃SiMe₃ with benzaldehyde were obtained with conversion efficiency up to 8000%.Electroreduction of bis-(trifluoromethyl)mercury (II) was established to be the route for the intermediate formation of trifluoromethyl anion, which was trapped by the reactions with benzaldehyde, Me₃SiCl and bromobenzonitrile.The use of salen Ni(II) complex as mediator allows the electrochemical reduction of polyfluoroalkylchlorides at the potentials more than 1 V higher than their reduction potentials.     

Synthesis of new imines and amines containing organosilicon groups

The Peterson olefination reaction of terephthalaldehyde with tris(trimethylsilyl)methyl lithium, (Me₃Si)₃CLi, in THF at 0 °C gives 4-[2,2-bis(trimethylsilyl)ethenyl]benzaldehyde (1) and 4,4-bis[2,2-bis(trimethylsilyl)ethenyl]benzene (2). The new aldehyde (1) reacts with variety of amines in ethanol to afford the corresponding imines (3) containing vinylbis(trimethylsilyl) group. The newly synthesized imines (3) can be completely converted into amines containing vinylbis(trimethylsilyl) group with an excess amount of NaBH₄. In the case of N-[4-(2,2-bis(trimethylsilyl)ethenyl)benzyl]-2,6-dimethylaniline LiAlH₄ was used as a reducing agent in THF.     

Synthesis of polyacetylenic montiporic acids by means of organosilicon compounds

A straightforward synthesis of polyacetylenic montiporic acids A and B has been developed, based upon the selective and sequential substitution of the two trimethylsilyl groups of the readily available 1,4-bis(trimethylsilyl)-1,3-butadiyne.     

Progress in the chemistry of organosilicon resists

Recent developments in the chemistry of organosilicon polymers for use as oxygen plasma-resistant imaging materials in microlithography are reviewed. Various classes of resists, grouped according to molecular structure, are described with special emphasis on properties critical in microlithographic applications. In addition, several silylation schemes involving selective silylation of a non-silicon-containing resist material following patternwise exposure to actinic radiation are also described.     

Synthesis of novel calix[4]arenes containing organosilicon groups

Metalation of (RSiMe₂)₃CH (1a R = H, 1b R = Me, 1c R = Ph) with lithium diisopropylamide (LDA) or methyllithium in THF gave organolithium reagents (RSiMe₂)₃CLi, which reacted with the formylated calixarene (2), to give the corresponding 5,17-bis[2,2-bis(organosilyl)-1-ethenyl]-25,26,27,28-tetrapropoxycalix[4]arenes (3a, 3b and 3c) via the Peterson olefination. The compounds (RSiMe₂)₃CLi were treated with 25,26,27,28-tetrakis(4-bromobutoxy)calix[4]arene (4) to give 25,26,27,28-tetrakis[4-(tris(dimethylsilyl)methyl)butoxy] calix[4]arene (5a) and 25,26,27,28-tetrakis[4-(tris(trimethylsilyl)methyl)butoxy] calix[4]arene (5b) via nucleophilic substitution reactions. However the compound 25,26,27,28-tetrakis[4-(tris(dimethylphenylsilyl)methyl)butoxy] calix[4]arene (5c) was not obtained, presumably because (PhSiMe₂)₃C- is highly sterically hindered and the reactivity of its derivatives is low. The compound 5a has potential as a core for dendrimers.     

Divalent silicon,germanium, and tin compounds with element--heteroatom bonds

Principal results and trends in chemistry of organic derivatives of divalent silicon, germanium, and tin containing bonds between these elements and the halogen, nitrogen, oxygen, and sulfur atoms are briefly surveyed. Selected characteristics of compounds with the element--phosphorus and element--arsenic bonds are discussed for comparison. Data on the synthesis and structures of new types of these compounds, viz., germanium(ii) diacylates, the alkoxy derivatives E¹⁴(OR)₂ and E¹⁴(OR)Y (E¹⁴ = Ge, Sn; R = Me₂NCH₂CH₂; Y = Cl, AcO, (Me₃Si)₂N), and the ate-complexes Li⁽⁺⁾[E¹⁴(OCH₂CH₂NMe₂)₃]^(–) and [Li(thf)₂]⁽⁺⁾[TsiE¹⁴(SBu)₂]^(–) (E¹⁴ = Ge, Sn; Tsi = (Me₃Si)₃C), are presented. It was established for the first time that germanium(ii) and tin(ii) derivatives can be stabilized in the monomeric form only through the intramolecular N_sp3E¹⁴ coordination bonds and the -acceptor effect of the oxygen atoms without introduction of bulky substituents.     

含硅有机锗化合物的合成

报道了一类含硅有机锗化合物的合成。从Ｍｅ３ＳｉＣｌ，ＲＸ，ＧｅＯ２出发，经过氯化、格氏反应、亲核取代等反应，制得目标化合物－－二〔烃基二甲硅基甲基〕锗的二氯化物。它们的结构经元素分析和红外表征。     

Synthesis of diarylenenaphthylene- and diaryleneanthrylene-containing organosilicon polymers and their applications to organic EL devices

Stille coupling reactions of bis(stannylphenyl- and stannylthienyl)silane with dibromonaphthalene and bis(bromothienyl)anthracene gave the corresponding polymers containing naphthylene or anthrylene units in the backbone. Applications of the polymers to electroluminescent (EL) devices were examined and it was found that the diphenyleneanthrylene-containing polymer can be used as a good hole-transporting material in a double-layered EL device.     

新型硝基亚甲基类新烟碱化合物的合成及其杀虫活性

以昆虫乙酰胆碱受体为作用靶标的新烟碱类杀虫剂属于高效、高选择性和环境友好的杀虫剂,依据新烟碱类杀虫剂活性与结构关系,以吡虫啉及其类似物NTN32692为先导结构,在咪唑啉环位置并入可以增强分子脂溶性的六元环基团,设计合成了9个未见文献报道的硝基亚甲基类新烟碱化合物,所有目标化合物的结构均经1H NMR、IR和HR-MS测试技术的确证。初步的生物活性测试结果表明,在500 mg/L下所有目标化合物对豆蚜(Aphis craccivora)都有一定的杀死活性,其中活性最高的化合物4对豆蚜(Aphis craccivora)的校正死亡率为73.0%。并对目标化合物5a～5h的合成方法进行了探讨。     

Synthesis and Insecticidal Activity of Novel Dithiophosphonates

A new series of dithiophosphonates has been synthesized using cycloiminium halides of pyridine, thiazole, and benzothiazole as starting material, dichlorophenylphosphine as phosphorylating agent, and 2-propanethiol as nucleophilic substituent. These compounds were tested for their insecticidal activity against a polyphagous insect plutella xylostella and found to exhibit potent pesticidal activity.     

Microwave‐assisted synthesis and insecticidal properties of biologically potent organosilicon(IV) compounds of a sulfonamide imine

Microwave‐assisted synthesis and spectroscopic studies of dimethyl‐, diphenyl‐ and triphenyl‐silicon(IV) chelates derived from the reactions of organochlorosilanes with the sodium salt of a biologically active nitrogen donor ligand N^∩NH are described. The resulting products have been isolated and characterized by elemental analyses, molecular weight determinations and conductance measurements. On the basis of electronic, infrared, ¹H, ¹³C and ²⁹Si NMR spectral studies, trigonal bipyramidal and octahedral geometries have been suggested for the resulting complexes. The biological activity of the ligand and its corresponding complexes has been examined with regard to antifungal and antibacterial activity against pathogenic fungi and bacteria, and the results are quite encouraging. All the compounds have also been found to act as nematicides and insecticides, by reducing the number of nematodes (Meloidogyne incognita) and insects (Trogoderma granarium). Copyright © 2005 John Wiley & Sons, Ltd.     

双苯甲酰基脲类化合物的合成及杀虫活性

双苯甲酰基脲类化合物的合成及杀虫活性;双苯甲酰基脲;合成;百菌清;杀虫活性     

有机硅化合物的不对称合成反应

介绍了“碳中心”手性有机硅化合物的合成,以及在烯丙基硅烷与醛的Hosomi-Sakurai反应和α-烯丙基硅碳负离子与醛的反应中的应用。提出并实践了两条提高对映选择性的途径。烯基硅醇的不对称环氧化反应扩展了Sharpless反应的适用范围,为合成光活性的具简单结构的环氧化合物提供了一条简易的途径。     

Synthesis of organosilicon polymers containing donor-acceptor type π-conjugated units and their applications to dye-sensitized solar cells

Novel organosilicon polymers having donor-acceptor type π-conjugated units in the backbone were prepared by Stille-coupling reactions of bis(tributylstannylthienyl)silanes with diiodoquinoxialine, benzothiadiazole, and benzothiaselenazole. Dehaloganative copolymerization of di(bromothienyl)silanes and dibromoquinoxaline was also studied, which gave the corresponding random copolymer. Applications of these polymers to dye-sensitized solar cells (DSSCs) were examined and it was found that the polymer containing benzoselenadiazole units as the acceptor exhibited the best performance as the sensitizer among the present polymers.     

新型含硅唑类化合物的合成及其生物活性的研究

新型含硅唑类化合物的合成及其生物活性的研究李文明,陈馥衡（北京农业大学应用化学系,北京,１０００９４）关键词有机硅化合物,唑类化合物,硅烷化,杀菌活性唑类化合物具有较强的生物活性,已作为杀菌剂广泛地应用于医药和农药,近年来,有机硅化合物作为生物活性物...