Alkene Epoxidation catalysed by Camphor-derived β-Ketophosphonate Complexes of Molybdenum(VI)

DOI: 10.1039/DT9950001221

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1221 - 1226 (1995)

Update date:2022-08-12

Topics:

Authors:

Clarke, Russell

Gahagan, Michael

Mackie, Raymond K.

Foster, Douglas F.

Cole-Hamilton, David J.

et al. et al.

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Article abstract of DOI:10.1039/DT9950001221

New β-ketophosphonates (L) have been prepared from (R)- or (S)-camphor with various substituents on the phosphorus atom and reacted with to form complexes .These complexes have been used to give highly active catalysts for epoxidation of alkenes by t-BuOOH.Very fast initial rates (ca. 400 catalyst turnovers in the first minute) gave way to much slower rates because the hemi-labile β-ketophosphonate is displaced by a diol ligand.In the presence of molecular sieves, the fast initial stage of the reaction is extended and for styrene, which gives low conversions followed by degradation in the absence of molecular sieves, styrene oxide can be formed with 98percent conversion and 94percent selectivity.It is demonstrated that both the t-BuOOH and the catalyst bind to the molecular sieves, the latter with loss of the β-ketophosphonate ligand.

Full text of DOI:10.1039/DT9950001221

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