Process for the preparation of polycyclic ethers

Details Process for the preparation of polycyclic ethers Process for the preparation of polycyclic ethers

1990-06-15

1991-12-31

Dentz, Bernard

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549385, 549389, 549398, 549462, C07D30792, C07D31192

Patent

active

050774174

ABSTRACT:
Process for the preparation of polycyclic ethers of formula ##STR1## wherein X represents --(CH.sub.2).sub.n --, index n stands for integer 0 or 1, symbol R.sup.4 designates a hydrogen atom or a methyl radical, symbols R.sup.1 and R.sup.2, identical or different, represent each a hydrogen atom or a lower alkyl radical from C.sub.1 to C.sub.3 and R designates either a C.sub.1 to C.sub.6 linear or branched alkyl radical, or a substituted or unsubstituted alkylene radical having 2 or 3 carbon atoms in the main chain, said alkylene radical forming a ring such as indicated by the dotted line, which process comprises the cyclization by means of an acidic agent of an unsaturated compound:

REFERENCES:
patent: 4503240 (1985-03-01), Staiger et al.
patent: 4613710 (1986-09-01), Buchi et al.

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