Abstract
Isotope-exchange experiments with H 2 18O proved at least the partial involvement of a P(V)-species ( 8) as an intermediate in the UV light-promoted fragmentation of phosphabicyclooctene ( 1). Selection between the alcohols of equimolar mixtures during the photochemical fragmentation of 1 also suggests a mechanism where an adduct ( 4) is formed in the rate-determining step affording the phosphorylated product ( 5) after decomposition. We were able to prove that the transient adduct ( 4) is formed in a reversible manner.
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