Process for the preparation of cycloaliphatic aldehydes

Details Process for the preparation of cycloaliphatic aldehydes Process for the preparation of cycloaliphatic aldehydes

1989-01-04

1990-05-01

Gray, Bruce

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

Organic compounds

Oxygen containing

568420, C07C 4545

Patent

active

049220276

ABSTRACT:
The cycloaliphatic aldehydes of formula ##STR1## wherein R.sup.0, R.sup.1 and R.sup.2 represent independently a hydrogen atom or a lower alkyl from C.sub.1 to C.sub.6 and X stands for a group of formula ##STR2## wherein R.sup.3 and R.sup.4 represent independenly a lower alkyl radical from C.sub.1 to C.sub.3 and R.sup.5 represents a lower alkyl radical or hydrogen, provided that R.sup.1, R.sup.3 and R.sup.4 do not represent simulataneously a methyl radical whenever R.sup.0 and R.sup.2 represent each a hydrogen atom, are prepared from enol esters of formula ##STR3## wherein the wavy line stands for a --C--O-- bond of cis or trans configuration, Y represents an acyl group or P(O)(OR).sub.2, wherein R stands for a lower alkyl monovalent radical or an aryl, and Z defines a group of formula ##STR4## wherein R.sup.3, R.sup.4 and R.sup.5 are defined as above, by cyclisation carried out by means of an acidic cyclisation agent.

REFERENCES:
patent: 4800233 (1989-01-01), Simmons

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