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TABLE OF CONTENTS

Volume 22 Issue 9 , Pages 481 - 551 (September 2008)


Full Papers

Kinetic monitoring of trisubstituted organotins in soil after sewage sludge application (p 481-487)
S. Dubascoux, G. Lespes, L. Denaix, M. Potin Gautier
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1421

 

This paper deals with organotin compounds (OTC) persistence in soil. The speciation of tributyltin (TBT), triphenyltin (TPhT) and their degradation compounds was achieved in an agricultural soil. This soil was contaminated by the way of spiked sewage sludge. The influence of organotin concentrations on their persistence and degradation rate was also studied. Monitoring of OTC was carried out as a function of time. Moreover, half-life times were evaluated for the trisusbstituted compounds.

 

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A comparative study of reactivity and selectivity of chiral diamines and structurally analogous amino alcohol ligands in enantioselective alkylations with diethylzinc (p 488-493)
M. Elisa Silva Serra, Dina Murtinho, A. M. d'A. Rocha Gonsalves
Published Online: Jun 20 2008 11:12AM
DOI: 10.1002/aoc.1428

 

A series of chiral -diamines and structurally analogous -amino alcohols derived from natural tartaric acid were synthesized and a comparative study of their activity and selectivity in the enantioselective alkylation of aromatic aldehydes was carried out. Our results show that in general the -diamines were found to be better chiral inducers than the corresponding -amino alcohols. The highest selectivity was observed when benzaldehyde was alkylated in the presence of the benzylic diamine, giving (R)-1-phenylpropanol with an ee of 42%.

 

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Synthesis, spectral characterization, electrochemical studies and catalytic properties in Suzuki-Miyaura coupling reactions of the mononuclear PdII, trinuclear PdII(BPh2)2 and RuIIbondPdIIbondRuII type complexes containing 4-amino-1-benzyl piperidine and phenyl groups (p 494-502)
Ahmetilic, Ismail Yilmaz, Mahmut Ulusoy, Esref Tas
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1430

 

New mononuclear [Pd(LH)2] and trinuclear PdII(BPh2)2 and RuIIPdIIRuII type metal complexes [where L = N, N-(4-amino-1-benzyl piperidine)-glyoxime] were synthesized and characterized, and their electrochemical properties were investigated using cyclic voltammetry (CV). The Suzuki-Miyaura reaction was used to investigate their activity as catalyst either prepared in-situ or from well-defined complexes. The catalytic results show that the bipyridine-Ru complex (5) and in situ formed catalyst systems [1 + Pd(OAc)2] are more efficient than the others.

 

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Palladium-catalysed Suzuki cross-coupling of primary alkylboronic acids with alkenyl halides (p 503-509)
Yacoub Fall, Henri Doucet, Maurice Santelli
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1432

 

PdCl(C3H5)(dppb) in the presence of Cs2CO3 as base efficiently catalyses the Suzuki cross-coupling reaction of primary alkylboronic acids with a variety of alkenyl halides. Both - and -substituted alkenyl halides were employed successfully.

 

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Synthesis of substituted vinylgermanes and germylsilylethenes via ruthenium complex catalyzed germylation of olefins (p 510-515)
Bogdan Marciniec, Hanna Lstrokawicka
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1434

 

Germylation of olefins (and dienes) with vinylgermanes and that with hydrogermanes catalyzed by [RuHCl(CO)(PCy3)2] can be used as a complement to the synthesis of substituted vinylgermanes. However, the synthesis of germylsilylethenes can proceed exclusively via germylation of vinylsilanes with vinylgermanes.

 

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Synthesis of a series of boronated unnatural cyclic amino acids as potential boron neutron capture therapy agents (p 516-522)
George W.abalka, Zhongzhi Wu, Min-Liang Yao
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1435

 

New boronated unnatural cyclic amino acids were synthesized for potential use in boron neutron capture therapy.

 

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Application of the anionic homologous Fries-rearrangement to the synthesis of 3-alkylbenzofuran-2(3H)-ones (p 523-528)
Ugo Azzena, Luisa Pisano, Mario Pittalis
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1437

 

2-(2-tert-Butyldimethylsilyloxyaryl) acetamides, easily prepared via an anionic homologous Fries-rearrangement of the corresponding 2-methylaryl esters of N,N-diethylcarbamic acid, were selectively metalated and monoalkylated at the benzylic position, thus disclosing a new approach to the synthesis of 3-alkylbenzofuran-2(3H)-ones.

 

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Superparamagnetic iron oxide as an efficient and recoverable catalyst for rapid and selective trimethylsilyl protection of hydroxyl groups (p 529-532)
Mohammad M. Mojtahedi, M. Saeed Abaee, Mohammad Eghtedari
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1442

 

At room temperature and under solvent-free conditions, various types of alcohols and phenols were efficiently protected within a few minutes by using hexamethyldisilazane and magnetically recoverable Fe3O4. Preferential protection of primary alcohols was observed when they competed with secondary or tertiary alcohols. Highly selective protection of phenols in the presence of aromatic amines or thiophenol was also observed.

 

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Reviews

Tin dithiocarbamates: applications and structures (p 533-550)
Edward R. T. Tiekink
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1441

 

Applications (biological potential and synthetic precursors for tin sulphide nanoparticles) and the structural chemistry of tin/organotin dithiocarbamate, (-S2CNR2), compounds are reviewed.

 

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Book Reviews

Albrecht Messerschmidt. X-Ray Crystallography of Biomacromolecules: A Practical Guide Wiley-VCH; November 2006. 305 pages; (hardcover). ISBN: 978-3-527-31396-9 (p 551)
Yu Wai Chen
Published Online: Jul 28 2008 10:33AM
DOI: 10.1002/aoc.1438

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