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Procedure: 3-Methylseleno-2,4,4-triphenyl-2-cyclo-butenone 5a: Lithium alkyneselenolate 3 (2 equiv), generated in situ from phenylacetylene (2 equiv), n-BuLi
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14 Crystallographic data for the structural analysis have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication, CCDC No. 176955 for 5b. Copies of this information can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge, CB2 1EZ, UK (fax:+44(1233)336033 or e-mail: deposit@ccdc.cam.ac.uk).
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