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Superparamagnetic Fe3O4is shown to act as a very efficient catalyst for the one-pot, three-component synthesis of 5,5-disubstituted hexahydropyrimidines and their spiropiperidines. The catalyst is easily recovered by the use of an external magnet and reused in several reactions without any noticeable loss of activity. The products are obtained in short time and good purity upon separation of the catalyst and evaporation of the volatiles of the reaction mixture.

The following article from the Journal of Applied Polymer Science, “Isolation and chemical structure characterization of enzymatic lignin from Populus deltoides wood,” by Ali Abdulkhani, Alinaghi Karimi, Ahmad Mirshokraie, Yahya Hamzeh, Nathalie Marlin, and Gerard Mortha, published online on 21 May 2010 in Wiley Online Library (wileyonlinelibrary.com), and in Volume 118, pp. 469‐479, has been retracted by agreement between the authors, the journal's editors, and Wiley Periodicals, Inc. The retraction has been agreed due to unacknowledged overlap between Figure 5 in the above paper and Figure 1 in Industrial Crops and Products, Volume 30 (2009), p. 137, as well as inappropriate data manipulation associated with this figure. The publisher acknowledges that co‐authors Nathalie Marlin and Gerard Mortha are not responsible for the issues associated with this article.

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An efficient chemoselective synthesis of novel substituted pyrano [2,3-d]pyrimidines is described. A number of pyrano[2,3-d:6,5-d']dipyrimidine-2,4,6,8(3H,5H,7H,9H)-tetraones and their sulfur analogs were synthesized through a one-pot condensation of arylglyoxal monohydrates with barbituric acid and thiobarbituric acid in the presence of excess ammonium acetate in water at room temperature, affording the desired products in moderate to good yields.

Cellulytic enzymes were used for the isolation and structural characterization of Populus deltoides wood lignin as a fast growing and important species in wood processing technology. The isolation was based on the hydrolysis and partial solubilization of wood xylan and cellulose using combination of Thricoderma lanuginosus xylanase, Aspergillus sp. plus, A. niger cellulase, and almond glycosidase, followed by lignin purification using Bacillus licheniformis alkaline protease (for hydrolysis of cellulase contamination). The structure of enzymatic lignin (EL) was elucidated using chemical analysis, Py-GC/ MS, FTIR, and quantitative