¬
E. Fernandez et al.
FULL PAPER
Heterogenised catalytic hydroboration/oxidation of styrene: Styrene
(2 mmol) was added to a suspension of supported catalyst (1 mol%
immobilised in 0.5 g of clay) in THF (2 mL) under nitrogen. The solution
was stirred for 5 min and freshly distilled catecholborane (2 mmol) was
then added. The mixture was stirred at ambient temperature for 2 h. The
solution was filtered off under vacuum and the filtrates were then quenched
with EtOH (2 mL). Workup must be carried out carefully due to the risk of
explosion when using peroxides with ether and THF. The quenched filtrates
were treated with NaOH (2m, 2 mL) and H2O2 (2 mL) and the mixture was
stirred for several hours. The mixture was finally extracted into Et2O,
washed with NaOH (2m), H2O and saturated brine and dried over MgSO4.
The products were then characterised by chromatography. The solid that
contained the complex was dried under vacuum for 10 min and introduced
into the Schlenk for another run.
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Acknowledgement
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The authors are grateful to the Ministerio de Educacion y TecnologÌa for
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Received: May 16, 2002 [F4096]
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