摘要:

AbstractThis review describes the structural chemistry of organotin carboxylates, covering data acquired for mono‐, di‐ and tri‐organotin compounds and complexes. A brief discussion is given for organotin amino‐acid deri

ISSN:0268-2605    

DOI:10.1002/aoc.590050102

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractCaps of the edible mushroomLaccaria amethystinacollected during September and October at forested sites in the vicinity of the town of Domzale in Central Slovenia, Yugoslavia, were found by neutron activation analysis (NAA) and hydride generation to have total arsenic concentrations between 109 and 200 mg As kg−1(dry mass). The extraction of fresh, frozen or freeze‐dried caps with cold Tris buffer at pH 7.6, or with boiling water, transferred 60–70% of the arsenic into the aqueous phase. Sephadex gel permeation chromatography indicated that the arsenic compounds in these extracts were not associated with proteins or other organic compounds of molecular mass larger than 4000 Dal.Cation‐exchange chromatography coupled with NAA, hydride generation, and reverse‐phase chromatography with arsenic‐specific detection (HPLC ICP) showed that dimethylarsinic acid is the major arsenic compound in the extracts. Methylarsonic acid and arsenate account for no more than 10% each of the to

ISSN:0268-2605    

DOI:10.1002/aoc.590050103

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThere is a high correlation between molecular surface area (TSA) of triorganotin and triorganolead compounds and their toxicity towards a bacterium (Escherichia coli) and an alga (Selenastrum capricornutum). Parallel attempts to correlate other Group IVA organometals incorporating silicon or germanium were unsuccessful. It was further demonstrated, however, that a high correlation was obtainable between certain series of compounds with the same organic substituent but different metal centers involving all Group IVA elements. In both instances, the inability to obtain a quantitative structure‐activity relationship (QSAR) for all systems studied appears to be a function of the solubility of the compounds. While organotin TSA values have been found to correlate well with their toxicities toward various organisms, this study clearly suggests that this type of QSAR can be readily extended to include other organometal systems, provided that there is no solubility problem and the toxicity is a function of the hydrophobicity of the organometal compound

ISSN:0268-2605    

DOI:10.1002/aoc.590050104

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractEthylenediamine bis(triphenylphosphine) monochlororhodium has been prepared by the interaction of Wilkinson's catalyst and ethylenediamine in benzene. The complex has been isolated and characterized by conventional and spectroscopic methods. The catalytic activity of the complex was investigated for the hydrogenation of 1‐octene as a model reaction at a hydrogen pressure of 1 atmosphere (101 kPa) using methanol as a solvent. The influence of various factors such as catalyst, substrate concentrations and temperature have been studied. The hydrido complex has been identified as an intermediate product by IR and NMR studies. The experimental data are in accordance with a rate expression of the form:\documentclass{article}\pagestyle{empty}\begin{document}$$ Rate = \frac{Kk_1[cat][H_2][olefin]}{k+k[olefin]} $$\end{document

ISSN:0268-2605    

DOI:10.1002/aoc.590050105

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractSynthetic, structural and biological aspects of trigonal‐bipyramidal, Me2Si(NS)Cl and octahedral, Me2Si(NS)2types of organosilicon (IV) complexes of heterocyclic thiosemicarbazones (NSH) have been described. The complexes were characterized by elemental analysis, molecular weight determination, conductance measurements and electronic, infrared,1H and13C NMR spectral studies. Some ligands and their corresponding dimethylsilicon (IV) complexes have been tested for their effects on several pathogenic fungi and bacteria. Two representative complexes have also been found to act as sterilizing agents by reducing the production of sperm in male m

ISSN:0268-2605    

DOI:10.1002/aoc.590050106

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractCommercial acrylonitrile butadiene styrene (ABS) polymers are among the most flammable of the currently available range of thermoplastic materials. In addition to having a rather low limiting oxygen index (LOI) value in the range 18.3–18.8, ABS polymers also produce compious amounts of smoke and hazardous gases when burnign in the air. In a recent study directed towards preparing and evaluating compounds which would simultaneously reduce the flammability and smoke produced from burning thermoplastic polymers, a synergistic flame‐retarding/smoke‐suppressing system based on organoiron compounds has been produced, which when properly compounded into ABS/PVC [poly(vinyl chloride)] blends more than doubles the LOI nad at the same time reduces smoke production signific

ISSN:0268-2605    

DOI:10.1002/aoc.590050107

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractContinuous wave (cw) CO2laser irradiation of some organosilicon polymers composed of ‐Me2Si‐, ‐Me2SiMe2SiCH2‐, RMeSi‐ and RMeSiMe2SiCH2CH2‐ units (where R = methyl, adamantyl, phenyl and hydrogen) leads to the evaporation of the polymer and is dominated by the formation of a solid deposit that has a continuous structure. It is assumed that chemical changes occur prior to the transfer of ejected material to the gas phase and that these consist mainly of the formation of high molecular biradicals or 1,2‐disilacyclobutane monomer that both re‐polymerize spontaneously upon their deposition onto a nearby cold surface. The mechanism of these specific decompositions of the polymers is assessed on the basis of the IR spectra of the deposits and, for the minor gaseous products, identification by G

ISSN:0268-2605    

DOI:10.1002/aoc.590050108

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

摘要:

AbstractThe newly synthesized η‐cyclopentadienyltitanium complexes of 1,3‐dihydro‐1, 3‐dioxo‐α‐(substituted)‐2H‐isoindole‐2‐acetates have been screened for their toxicity againstColumba livia(Gmelin) (the blue rock pigeon) and exhibit moderate toxicity towards this non‐target bird. The bis‐ derivatives have been observed to be generally more active than the mono‐ ones, indicating the dominant contribution of ligands towards toxicity compared with cyclopentadien

ISSN:0268-2605    

DOI:10.1002/aoc.590050109

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

ISSN:0268-2605    

DOI:10.1002/aoc.590050111

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY

ISSN:0268-2605    

DOI:10.1002/aoc.590050112

出版商:John Wiley&Sons, Ltd.    

年代:1991

数据来源: WILEY