1λ3σ2,6λ3σ2-Diphospha-1,2,4,5-hexatetraen aus 1,6-Di-H-1,6-diphosphino-2,4-hexadiin
摘要:
1,6-Di-H-1,6-diphosphino-2,4-hexadiyne 5 undergoes base-catalyzed heteropropargylic rearrangement to give 1,6-diphosphahexatetraene 3a, which forms stereoselective 3,4-diphosphamethylencyclobutene 4a by valence isomerisation.