Acyclic Phosphaalkenes

Phenylmethylsilanediol, synthesis, 42 155 Phenylsilanetriol, monosodium salts, 42 169 4 -Phenyl-2,2 6, 2 -terpyridine bis nickel complex, 30 74 molecular structure, 30 74 PhjtfluorenyllSiOH, 42 197 (Ph(Me2N)C-=Nli], 37 59-65 orientation of imino ligand, 37 61-63 (PhMe SiljCSiH OH, 42 244-245, 248 (PhMe SiljCsiMeHlOH), 42 191 Phosphaalkenes acyclic, 33 338-353 butadienes, 33 346-349 cumulenes, 33 352... 

The isolation of compounds containing simple C=P double bonds parallels the triple-bond work. The first stable acyclic phosphaalkene was synthesized over fifteen years ago.17 Again, base-induced dehydrohalogenation and stabilization by bulky groups is important ... 

Frequently, [3+2] cycloadditions of 1,3-dipolar reagents such as PhN3, diazoalkanes, or nitrile oxides to acyclic phosphaalkenes provides access... 

Attempts to trap P-tert-butyl substituted phosphaalkene complexes 66c-e with 2,3-dimethylbutadiene have been unsuccessful, owing to the poor reactivity of the diene at low temperatures. This limitation is circumvented when the respective f-butyl-substituted complexes are exposed to electron-rich acyclic dienes such as l-methoxy-l,3-butadiene, l-(trimethylsilyloxy)- ,3-butadiene, and l-methoxy-3-(trimethylsilyloxy)-... 

The scope of three-membered rings with two heteroatoms of heavier group 15 elements includes essentially heterocyclopropanes and heterocyclopropenes with two phosphorus atoms. This chapter also covers bicyclic and polycyclic molecules containing the structural motif of the rings under discussion. Such species frequently result from transformations of phosphaalkenes or oligomers. Monocyclic diphosphirane and diphosphirene derivatives are synthesized from acyclic precursors with a P-C-P linkage or alternatively via [2-1-1] cycloadditions. A few examples... 

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