206
to conjugated ketone
209
followed by cyclization furnished the product
207
with
recovery of the catalyst, PbO NPS (Scheme 95).
Scheme 95. Proposed mechanism for formation of
xanthenedione derivative.
9.4. Perlite @IL/ZrCl
4
mediated synthesis of Xanthenes
Moradi
et al.
employed perlite nanoparticles modified with
Lewis acidic ionic liquid (perlite NP@IL/ZrCl
4
) as
heterogeneous nanocatalyst for the one-pot synthesis of
xanthene derivatives.
[66]
Perlite, an volcanic glass containing
silica (70-75%), alumina (12-15%), and traces of oxides of
sodium, potassium, iron, magnesium and calcium. As shown
in scheme 96, ionic liquid Si(pmim)Cl
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