Dinaphtazepinium salts useful as enantioselective epoxidation catalysts
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United States of America Patent
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May 16, 2000
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N/A
app pub date -
Jun 1, 1998
filing date -
Aug 9, 1995
priority date (Note) -
Expired
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Abstract
A compound of formula (Ia) of (Ib), wherein A and B each independently represents hydrogen or one, two or three naphthylidene substituents, which substituents are selected from C.sub.1-6 alkyl, C.sub.1-6 alkoxy, aryl, aryloxy, silyl and silyloxy; R.sup.1 represents phenyl, C.sub.1-6 alkyl, phenyl C.sub.1-6 alkyl or a moiety of formula (a): wherein R.sup.2 represents C.sub.1-6 alkyl, phenyl or benzyl, R.sup.3 represents H or OR.sup.4 wherein R.sup.4 is C.sub.1-6 alkyl or C.sub.1-6 alkylsilyl and n is zero or an integer 1 or 2; and X.sup.- is a counter ion; a process for the preparation of such compounds and the use of such compounds for enantioselectively epoxidising a prochiral olefin.
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