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atome de carbone insaturé

Treponemycin, a nitrile antibiotic active against treponema hyodysenteriae.... A sharp infrared absorption band for nitrile at 2,220 cm-1 and the presence of an unsaturated group indicated that the nitrile function may be attached to an unsaturated carbon atom....

général - core.ac.uk - PDF: www.pubmedcentral.nih.gov

The regio- and stereospecific synthesis of diarylpropenyllithium compounds from dimethylamino- and dimethylaminomethyl-substituted diarylacetylenes viatransmetallation reactions involving diarylpropenylmagnesium and tin compounds...arylacetylenes.Reaction of the asymmetric diarylacetylenes with methylmagnesium bromide in the presence of NiCl{2}(PPh{3}){2} gave stereo- and regio-selectively cis addition products in which the aryl group bearing the built-in ligand (Me{2}N or Me{2}NCH{2}) and the magnesium atom are bonded to the same unsaturated carbon atom....

PDF: www.loc.gov