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DOI: 10.1055/s-2007-965909
Synthesis of Arylcalcium Halides - General Procedure, Scope and Limitations
Publikationsverlauf
Publikationsdatum:
25. Januar 2007 (online)
Abstract
A general procedure for the synthesis of a wide variety of arylcalcium halides by activation of the alkaline earth metal as well as bromo- or iodoarenes is reported. Chloro- and fluoroarenes are not suitable substrates for an insertion of calcium into the carbon-halogen bond. Furthermore, ortho-fluoro substitution prevents the formation of the corresponding heavy calcium organometallics. The ipso-carbon atoms show a strong low-field shift in the 13C NMR spectra. The arylcalcium iodides crystallize monomeric as tetrakis(THF) complexes. Naphthylcalcium iodide shows a Ca-C bond length of 255.2(6) pm which lies in the characteristic region.
Keywords
Grignard reaction - arylcalcium halides - direct synthesis - calcium - metal activation
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CCDC-627216 contains the supplementary crystallographic data for compound 12. These data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336 033; or deposit@ccdc.cam.ac.uk).