Microwave irradiation promotes the conversion of enaminoketones formed in situ into a variety of heterocycles by reaction with the appropriate bidentate nucleophile. The advantages of the method over previous approaches are short reaction times and facile purification by precipitation of the products in aqueous media. Moreover the convenient one-pot procedure makes these syntheses particularly suitable for library production. Organic reactions in aqueous media have become of great interest as water is not only more environmentally friendly, but also because organic reactions in water often display unique reactivity and selectivity.

In 2 extended chains of copper ions are linked by double-bridging pyzdcH-groups while 3,4, and 5 have structures in which pyzdc2-ligands bridge metal centers to form extended linear chains. Magnetic susceptibility studies reveal antiferromagnetic interactions in 1,2,3,4, and 6 (6 is Cu(pyzdc)). The magnitude of exchange (-zJ = 0.033 cm-I for 1 and -J = O.l1,0.74,0.049, and 1.14 cm-' for 2,3,4, and 6, respectively) is discussed in terms of the structures and d-electron configurations involved.Key words: metal 2,3-pyrazinedicarboxylates, synthesis, X-ray structure, antiferromagnetism. Mors c l b : pyrazine-2.3-dicarboxylates mCtalliques, synthbse, structure par diffraction des rayons X, antiferrornagnitisme.[Traduit par la rCdaction]

Cu-catalyzed decarboxylative alkynylation of quaternary α-cyano acetate salts with alkynyl bromides and alkynyl chlorides is described. This new reaction can be used for preparing functionalized butynenitrile derivatives.

Manganese and cadmium complexes of singly and doubly deprotonated 2,3-pyrazinedicarboxylic acid (pyzdcH,) have been prepared and studied. Crystal data: [H,O], [Mn(pyzdc) ,

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