Keywords
1,3,2-dioxaphospholanes
aldol reaction
cage phosphoranes
hexafluoroacetone
PCO/POC-rearrangement
spirophosphoranes
Abstract
Reaction of 2-[(2-methylcarbonyl)phenyloxy]-4,4,5,5-tetra-methyl-1,3,2-dioxaphospholane with hexafluoroacetone leads to the simultaneous formation of two P–C/P–O-cage phosphoranes. The P–C-cage species does not convert to the P–O-cage one neither under the kinetically (3 years, 20–25 °C, dichloromethane) nor under the thermo-dynamically controlled conditions (110 °C, toluene, 8 h).
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