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TABLE OF CONTENTS

Volume 19 Issue 11 , Pages 1141 - 1205 (November 2005)


Content

Contents (p i-iii)

Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.1004

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Speciation Analysis and Environment

Organotin contamination, imposex and androgen/oestrogen ratios in natural populations of Nassarius reticulatus along a ship density gradient (p 1141-1148)
C. M. Barroso, M. A. Reis-Henriques, M. Ferreira, P. E. Gibbs, M. H. Moreira
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.955

 

In Ria de Aviero (NW Portugal) Nassarius reticulatus presents increasing tributyltin (TBT) body burdens (b.b.) from the open coast (16-26 ng Sn g-1 dw-dry weight) towards the ports inside the estuary (195-272 ng Sn g-1 dw). Imposex also increased from the open coast (vas deferens sequence index (VDSI): 0.0-0.5; relative penis length index (RPLI): 0.0-2.4; penis length index (PLI): 0.0-0.3 mm; percentage of affected females (%I): 0-30) towards the ports (VDSI: 3.8-4.8; RPLI: 51-80; PLI: 6.7-10.8 mm; %I: 100). The ratio of testosterone/17-estradiol in females tended to increase with increasing imposex and organotin contamination.

 

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Materials, Nanoscience and Catalysis

Electrocatalytic oxidation of sulfite by acetylferrocene at glassy carbon electrode (p 1149-1154)
Zuo-Ning Gao, Jin-Fu Ma, Wan-Yi Liu
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.975

 

The electrochemical oxidation of sulfite catalyzed by acetylferrocene (AFc) at a glassy carbon electrode (GCE) in 0.2 M NaClO4 aqueous solution has been studied by cyclic voltammetry. Experimental conditions that maximize the current efficiency of the electrocatalytic oxidation, such as pH and the catalyst (AFc) and substrate (sulfite) concentrations, were also investigated in this work. The reaction rate constant for catalytic oxidation was evaluated as (7.02 ± 0.05) × 104 M-1 s-1 by chronoamperometry. The catalytical oxidation current is proportional to the sulfite concentration and the result can be applied in the determination of real samples.

 

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On the reactivity of platina-beta-diketones: a straightforward synthesis of trans-acetylchlorobis(phosphine)platinum(II) complexes and their reactivity (p 1155-1163)
Christian Albrecht, Christoph Wagner,urt Merzweiler, Tadeusz Lis, Dirk Steinborn
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.976

 

Starting from the platina--diketone 1 (being easily accessible from hexachloroplatinic acid and Me3SiCCSiMe3), acetylchlorobis(phosphine)platinum(II) complexes 2 with a wide variety of phosphine ligands L are available. Furthermore, ligand substitution reactions of complexes 2 and their decarbonylation to yield methylplatinum complexes are described.

 

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Influence of metal core of mixed-metal carboxylates in preparation of spinel: ZnFe2O(O2CCF3)6 as a single-source precursor for preparation of ZnFe2O4 (p 1164-1167)
M. M. Amini, M. Yadavi
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.979

 

In the pyrolysis of ZnFe2O(O2CCF3)6(C4H8O)2(H2O) in air at 400 °C pure ZnFe2O4 is formed, in contrast to the pyrolysis of the trichloro derivative, which resulted in the formation of ZnO and Fe2O3. In the pyrolysis of MnFe2O(O2CCF3)6(C4H8O)2(H2O) in nitrogen, MnFe2O4 forms as the main phase and single oxides as minor phases.

 

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Synthesis and crystal structure of three nido 11-vertex platinaborane clusters (p 1168-1175)
Jianmin Dou, Libin Wu, Qingliang Guo, Dacheng Li, Daqi Wang, Chunhua Hu, Peiju Zheng
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.990

 

The reaction of [PtCl2(PPh3)2] with closo-B10H102- in ethanol under reflux conditions gave two nido 11-vertex platinaundecaborane clusters: [(PPh3)2 PtB10H10-8,10-(OEt)2] (1) and [(PPh3)2 PtB10H11-11-OEt] (2). A novel B10H102- deboronated nido 11-vertex diplatinaundecaborane [(µ-PPh2)(PPh3)2Pt2-B9H6-3,9,11-(OEt)3·CH2Cl2 (3) was obtained when the same reaction was carried out under solvothermal conditions.

 

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Facile synthesis of a tricyclohexylphosphine-stabilized eta3-allyl-carboxylato Ni(II) complex and its relevance in electrochemical butadiene carbon dioxide coupling (p 1176-1179)
Peter S. Schulz, Olaf Walter, Eckhard Dinjus
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.993

 

Cyclic 3-allyl-carboxylato Ni(II) complexes, which arenown to be intermediates in the CC coupling of butadiene and CO2, can be synthesized in one step by oxidative addition of pentadieneoic acid at an Ni(0) centre.

 

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Main Group Metal Compounds

Syntheses and properties of a thiacrown ether and its acyclic model compound modified with germanium moieties (p 1180-1184)
Toshihiro Ida, Yutaka Takase, Yoshito Takeuchi
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.945

 

A thiacrown ether (1) and its acyclic model compound (2) modified with germanium moieties were synthesized and their structure confirmed by NMR spectroscopy and elemental analysis. It was shown that the germanium atom in one of the side chains of 2 is pentacoordinated. The cation capture/transport ability is almost ineffective for both compounds. It was suggested that the proximity of cation and anion binding sites would be responsible for this failure.

 

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Synthesis, characterization and thermal behaviour of four homoleptic titanium silanolates (p 1185-1188)
Dirk Mansfeld, Markus Schürmann, Michael Mehring
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.967

 

Thermal decomposition of four titanium silanolates Ti(OSiR2R)4 was compared in order to study their potential for the synthesis of titanium silicates. Single crystals of the novel titanium silanolate were obtained and its molecular structure is discussed.

 

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Embryotoxicity studies of tri-n-butyltin(IV) complexes of 5-[(E)-2-(aryl)-1-diazenyl]-2-hydroxybenzoic acid and 2-[(E)-2-(3-formyl-4-hydroxyphenyl)-1-diazenyl] benzoic acid on sea urchin development (p 1189-1195)
Tushar S. Basu Baul, Wandondor Rynjah,eisham Surjit Singh, Claudia Pellerito, Paolo D'Agati, Lorenzo Pellerito
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.971

 

The toxicity studies of free 5-[(E)-2-(aryl)-1-diazenyl]-2-hydroxybenzoic acid and 2-[(E)-2-(3-formyl-4-hydroxyphenyl)-1-diazenyl]benzoic acid and their tri-n-butyltin(IV) complexes were evaluated by using sea urchin early developmental stages as recommended model organisms for toxicity tests. The tri-n-butyltin(IV) complexes caused mitosis block and induced high embryonic mortality in sea urchin.

 

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Facile synthesis of pyridinium aryltetrachlorotellurates: crystal and molecular structure of [C5H6N][RTeCl4] (R = m-O2NC6H4, p-NCC6H4) (p 1196-1201)
Jens Beckmann, Andrew Duthie, Cassandra Mitchell
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.986

 

The reaction of triarylboroxine pyridine complexes with tellurium tetrachloride afforded good yields of pyridinium aryltetrachlorotellurates when air moisture was present at the work-up stage. The structures of two compounds were established by X-ray crystallography, showing that two anions are connected via secondary Te Cl interactions and that the cations are associated to the anions by weak CHCl and NH Cl interactions.

 

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1,3-Dihydro-1-hydroxy-3-morpholin-4-yl-2,1-benzoxaborole: product of the reaction of o-formylphenylboronic acid with morpholine (p 1202-1203)
Andrzej Sporzynacuteski, Michalstrok Lewandowski, Paulina Rogowska, Michalstrok. Cyranacuteski
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.991

 

o-Formylphenylboronic acid reacts with morpholine to give a cyclic condensation product. The crystal structure comprises a hydrogen-bonded centrosymmetric dimer motif with a planar benzoxaborole part that is very similar to that observed in two other benzoxaborole derivatives. The interactions are relatively strong, with the O···Oi distance being 2.797(2) Å.

 

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Book Review

EDITED BY P.raft and. A. D. Swift. Perspectives in flavor and fragrance research. Wiley-VCH, 2005, 242 pp. ISBN 3-90639-036-5 (p 1204)
A. J. Taylor
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.964

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P. Andrew Evans. Modern rhodium-catalyzed organic reactions. Wiley-VCH; 2005, 496 pp; ISBN-10: 3-527-30683-8 (hardcover), ISBN-13: 978-3-527-30683-1 (p 1205)
Robin Whyman
Published Online: Oct 12 2005 6:39AM
DOI: 10.1002/aoc.989

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