1,3-Diphosphole derivatives, cationic
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
1λ5,3λ5-Diphosphole Derivatives from Bis(diphenylphosphino)methane and Propargyl BromidesThe two title reagents 2 and 3 form a five-membered 1,3-diphosphole ring by nucleophilic interaction of the two phosphino groups of 2 with the methylene carbon atom and the adjacent acetylenic carbon atom of 3. (Phosphinomethyl)propargylphosphonium, diphosphafulvenium and diphospholium bromides (4, 6, and 1) result and can be isolated from consecutive steps of this reaction. By hydrolysis the diphospholium rings of 1 and 6 are selectively opened at the PCP unit to yield four different isomeric (phosphinoylpropenyl)phosphonium bromides 8 - 11.
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