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TABLE OF CONTENTS

Volume 19 Issue 7 , Pages 807 - 909 (July 2005)


Contents

Contents (p i-v)

Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.952

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Speciation Analysis and Environment

Toxic effect of triphenyltin on Lemna polyrhiza (p 807-810)
Zhihui Song, Guolan Huang
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.893

 

Little data about toxic effect of triphenyltin (TPT) on aquatic plants is available. The purpose of this paper is to study the toxic effect of TPT on duckweed, Lemna polyrhiza, and the bioconcentration factor of TPT by Lemna polyrhiza. At 5µg/l concentration TPT treatment, a toxic effect on growth of Lemna polyrhiza appeared. The 8 day IC50 of TPT to Lemna polyrhiza was 19.22µg/l. TPT stimulated peroxidase activity and nitrate reductase activity at 2 and 5µg/l. TPT reduced chloroplast activity of Lemna polyrhiza at 2 and 5µg/l. Bioconcentration factors of TPT for Lemna polyrhiza were 4.3 and 10.9 at 2 and 5µg/l, respectively.

 

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Occurrence of butyltin compounds in marine sediments and bivalves from three harbour areas (Saigon, Da Nang and Hai Phong) in Vietnam (p 811-818)
D. D. Nhan, D. T. Loan, I. Tolosa, S. J. de Mora
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.923

 

A survey of organotin compounds comprising tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT) in sediment and clam (Meretrix meretrix) was undertaken in Vietnam in 2003. Measurable amounts of TBT, DBT and MBT were found in all samples.

 

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Biodegradation of arsenosugars in marine sediment (p 819-826)
Paramee Pengprecha, Mhairi Wilson, Andrea Raab, Jörg Feldmann
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.579

 

In the marine environment, arsenic accumulates in seaweed and occurs mostly in the form of arsenoribofuranosides (often called arsenosugars). This study investigated the degradation pathways of arsenosugars from decaying seaweed in a mesocosm experiment.

 

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Materials, Nanoscience and Catalysis

Short communication: Preparation of Pt13 clusters in the presence of trialkylaluminium (p 827-829)
Fei Wen, Helmut Bönnemann, Richard J. Mynott, Bernd Spliethoff, Claudia Weidenthaler, Natalie Palina, Svetlana Zinoveva, Hartwig Modrow
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.913

 

A Pt13 cluster (0.75 ± 0.10 nm) stabilized by an organoaluminium shell has been prepared for the first time. Slow oxidation transforms the organoaluminium shell into an aluminium oxide matrix in which Pt13 clusters are uniformly dispersed. The one-shell structure of the cluster was confirmed by X-ray absorption near-edge spectrum.

 

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Reaction of olefins using cerium(IV) sulfate tetrahydrate in carbonyl compounds-H2O (p 830-833)
Ken-ichi Itoh, Tetsuya Ueki, Hironobu Mikami, Wen Chai, Hiroshi Sakamaki, C. Akira Horiuchi
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.906

 

The reaction of olefins with cerium(IV) sulfate tetrahydrate in acetone-H2O under reflux for 5 h gave 2-oxo- and 2-oxo-5-hydroxy derivatives.

 

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Application of electrochemically generated molybdenum-based catalyst system to the ring-opening metathesis polymerization of norbornene and a comparison with the tungsten analogue (p 834-840)
Okan Dereli, Cemil Aydogbrevedu, Bülent Düz, Yavuz Idotmamogbrevelu
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.907

 

An electrochemically generated molybdenum-based catalyst system is applied to the ring-opening metathesis polymerization of norbornene. The results are compared with those obtained using a tungsten-based catalyst system.

 

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Cross-linked resins functionalized with triorganotin carboxylates: synthesis, characterization and preliminary catalytic screening in transesterification (p 841-847)
Luigi Angiolini, Daniele Caretti, Laura Mazzocchetti, Elisabetta Salatelli, Rudolph Willem, Monique Biesemans
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.909

 

New catalytic systems derived from low-cost ion-exchange resins were prepared by functionalization of free carboxylic units with different triorganotin derivatives. The products obtained where characterized and tested in the transesterification reaction between ethyl acetate and primary, secondary and tertiary alcohols. The trialkyltin carboxylate anchored to the resin shows a promising activity that can be related to steric hindrance of the tin substituent, as well as to the alcoholic substrate.

 

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Synthesis, characterization and thermal degradationinetics of ferrocene-containing aramids (p 848-853)
Zareen Akhter, Mubasher A. Bashir, M. Saif ullahhan
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.912

 

Four ferrocene containing polyamides (aramids) were prepared by low temperature solution polycondensation of 1,1-ferrocenedicarboxylic acid chloride with 1,4-diaminophenylene, 4,4-diaminophenyl ether, 4,4-diaminobiphenyl and 1,8-diaminonaphthalene and were characterized by their solubilities, inherent viscosities, elemental analysis, FTIR spectroscopy, differential scanning calorimetry and thermogravimetry.

 

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IR laser-induced synthesis of nanostructured gemanium telluride in the gas phase (p 854-858)
Josef Pola, Dana Pokorná, María Jesús Diánez, María Jesús Sayagués, Zdenecaronk Bastl, Vladimír Vorlíccaronek
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.916

 

IR laser irradiation of gaseous (CH3)4Ge(CH3)2TeSF6 mixtures results in homogeneous decomposition of both organometallics and deposition of nanostructured germanium tellurides GeTex(x = 1, 2), the formation of which is explained by an intermediacy of germanium and tellurium clusters and by reaction between these clusters in a hot laser-induced zone. This is the first example of synthesis of germanium tellurides in the gas phase.

 

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Synthesis and X-ray single-crystal structure study of 5,5prime-bis(silyl)-functionalized 3,3prime-dibromo-2,2prime-dithiophenes (p 859-863)
Thomas Baumgartner
Published Online: May 20 2005 11:28AM
DOI: 10.1002/aoc.917

 

5,5-Bis(silyl)-functionalized 3,3dibromo-2,2-dithiophenes (I) can be synthesized very efficiently by reaction of 3,3,5,5-tetrabromodithiophene with two equivalents of n-BuLi and the respective silyl chloride in tetrahydrofuran. The substitution pattern of silyl functionalization has a significant influence on the degree of -conjugation of dibromo-dithiophenes and their molecular packing in the solid state, as determined by single crystal X-ray crystallography. These features are essential for potential applications in molecular electronics.

 

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Preparation, characterization and biological evaluation of copper(II) and zinc(II) complexes with Schiff bases derived from amoxicillin and cephalexin (p 864-869)
Mohammad S. Iqbal, Iftikhar H. Bukhari, Muhammad Arif
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.918

 

Copper(II) and zinc(II) complexes of Schiff bases derived from amoxicillin and cephalexin have been prepared and characterized. These complexes showed an enhanced biological activity with low toxicity.

 

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Benzimidazolin-2-ylidene-palladium-catalysed coupling reactions of aryl halides (p 870-874)
Yetkin Gök, Nevin Gürbüz, Idotsmail Özdemir, Bekir Çetinkaya, Engin Çetinkaya
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.922

 

A convenient method for Heck and Suzuki cross-coupling reactions is presented, employing a catalyst formed in situ from Pd(OAc)2, air-stable 1,3-dialkylbenzimidazolium chlorides.

 

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Crystallographic report: The crystal structure of bis-(3,3-dimethyl-3,4-dihydro-2H-1-thia-4a,9-diaza-3-sila-fluorene) silver nitrate (p 875-876)
Pavel Arsenyan, Ramona Abele, Sergey Belyakov, Edgars Abele, Edmunds Lukevics
Published Online: Jun 2 2005 8:43AM
DOI: 10.1002/aoc.915

 

The structure of a silver nitrate complex with two molecules of the 2-mercaptobenzimidazole derivative is presented.

 

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Crystallographic report: Crystal structure of bis(2,4,6-tri-tert-butylphenolato-O) bis(tetrahydrofuran-O) samarium (N,N-eta2-azobenzene) diethyl ether solvate (p 877-878)
Fugen Yuan, Xiujuan Liu
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.925

 

The title complex was synthesized by the reaction of divalent Sm(OAr)2(THF)3 (Ar = C6H2-tert-Bu3-2,4,6; THF = tetrahydrofuran) with one equivalent of azobenzene in THF. In the complex, the NN bond length for the azobenzene species is lengthened. The two SmN bond lengths are intermediate between the donor bond and the single bond.

 

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Main Group Metal Compounds

Microwave-assisted synthesis and insecticidal properties of biologically potent organosilicon(IV) compounds of a sulfonamide imine (p 879-886)
R. V. Singh, Mukta Jain, C. N. Deshmukh
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.904

 

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 NNH are described. The resulting products were isolated and characterized. On the basis of electronic, infrared, 1H, 13C and 29Si NMR spectral studies, trigonal bipyramidal and octahedral geometries are suggested for the complexes. All the compounds have also been found to act as nematicides and insecticides by reducing the numbers of Meloidogyne incognita and Trogoderma granarium respectively.

 

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Competitiveinetic study of the amination of organomagnesium and -zinc reagents with acetone O-sulfonyloxime (p 887-893)
Ender Erdik, Özgen Ömür
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.908

 

Substituent effects on reactivity for the electrophilic amination of phenylmagnesium bromides and catalytic phenyl zinc cyanocuprates with acetone O-(2,4,6-trimethylphenylsulfonyl)oxime were determined by competitiveinetics. The reactions give linear Hammett plots. Mechanisms of these reactions are also discussed.

 

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Reduction of dichlorodiphenylstannane (p 894-897)
Masaichi Saito, Yuichiro Okamoto, Michikazu Yoshioka
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.911

 

Reduction of dichlorodiphenylstannane with lithium followed by the treatment with methyl iodide gave methyltriphenylstannane, dimethyldiphenylstannane and 1,2-dimethyldistannane. 1,2-Dilithiodistannane and triphenylstannyllithium were intermediates of this reaction.

 

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Utilization of organogallium and organoindium compounds as alkylation reagents in organic synthesis: the addition of trialkylgallium and trialkylindium to aldehydes catalyzed by Lewis acids (p 898-902)
Zhenya Dai, Mingran Shao, Xianshan Hou, Chengjian Zhu, Yuhua Zhu, Yi Pan
Published Online: May 9 2005 4:48AM
DOI: 10.1002/aoc.914

 

The utilization of organogallium and organoindium compounds as alkylation reagents in the addition to aldehydes was realized with titanium tetrachloride as catalyst. The asymmetric addition of trialkylgallium to aldehydes was also investigated using chiral titanium catalysts with ee values up to 84%.

 

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Azacrown ethers modified with germanium-containing side-chains as heteroditopic hosts (p 903-907)
Yamato Nakamura, Yoshito Takeuchi
Published Online: May 20 2005 11:28AM
DOI: 10.1002/aoc.919

 

The cation capture/transport abilities of diazacrown ethers with (5a) and without (7) side chains containing germanium, and 4,13-diaza-18-crown-6 (8) were found to decrease in the order 5a > 7 > 8. Titration and 73Ge NMR failed to give unequivocal rationalization of the results.

 

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Book Review

Edited by Astrid Sigel and Helmut Sigel. Metal ions in biological systems, Vol. 42, Metal complexes in tumor diagnosis and as anticancer agents. Marcel Dekker, 2004. 0-8247-5498-8 (hardcover) (p 908)
David R. Williams
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.903

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Herbert Waldman and Petra Janning. Chemical biology, a practical course. Wiley-VCH, 2004, 207 pp; ISBN 3-527-30778-8 (paperback) (p 909)
P. H. Whiting
Published Online: Jun 14 2005 5:06AM
DOI: 10.1002/aoc.900

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