- Diels-Alder Adducts of the Diphosphene F3CP=PCF3
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The heterocycles 3 to 6 are formed in a one-pot procedure by reacting trifluoromethyl phosphorus diiodide F3CPI2 with tin dichloride SnCl2 in the presence of the corresponding 1,3-dienes.The reactions proceed via cycloaddition of the diphosphene intermediate F3CP=PCF3 (1) as suggested by the high yields obtained (50 to 100percent) and the formation of the cyclic tetraphosphane (F3CP)4 (2) as the only by-product.Cycloreversion occurs at moderate temperatures as demonstrated by the reaction of 6 with 2,3-dimethylbutadiene to give 3 and cyclohexadiene.The products have been characterized by NMR and mass spectra. - Key words: Perfluoromethyl Diphosphene, Preparation (in situ), Cycloaddition, Mass Spectra, NMR Spectra
- Grobe, Joseph,Van, Duc Le,Schulze, Joachim
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p. 1753 - 1755
(2007/10/02)
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