Process for selective preparation of hydroxybenzaldehydes

Details Process for selective preparation of hydroxybenzaldehydes Process for selective preparation of hydroxybenzaldehydes

1993-11-18

1995-03-07

Reamer, James H.

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

Organic compounds

Oxygen containing

C07C 4549

Patent

active

053959787

ABSTRACT:
Process for preparing hydroxybenzaldehydes of the formula (1) ##STR1## in which R.sup.1 -R.sup.4 are hydrogen, fluorine, chlorine, bromine, alkyl, alkoxy, phenyl, naphthyl, phenylalkyl, naphthylalkyl, phenoxy or saturated or unsaturated cyclopentane or cyclohexane radicals, and R.sup.1 -R.sup.4 may with the hydroxybenzene ring carbon atoms on which they are located form 1 or 2 saturated or unsaturated isocyclic or heterocyclic rings, by admixing 1 mol of a phenol of the formula (2) ##STR2## in which R.sup.1 -R.sup.4 have the stated meanings, in a pressure vessel with from 5 to 100 mol of hydrogen fluoride and from 0.5+x to 1.5+x mol of boron trifluoride, where x is the number of oxygen atoms contained in the starting compound (formula (2)), setting the mixture to from -10.sup..degree. to 100.degree. C. and then passing carbon monoxide into this mixture until a pressure of from 10 to 150 bar is reached and allowing the mixture to react at the desired pressure reached.

REFERENCES:
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patent: 3098875 (1963-07-01), Schmerling
patent: 3948998 (1976-04-01), Fujiyama et al.
patent: 4368336 (1983-11-01), Fujiyama et al.
patent: 4460794 (1984-07-01), Fujiyama et al.
patent: 5208383 (1993-05-01), Takefumi et al.
patent: 5235109 (1993-08-01), Langi et al.
Chemical Abstracts, vol. 070, No. 7, "Reaction of phenol with carbon monoxide under high pressure in the medium of hydrogen fluoride and boron fluoride", Feb. 17, 1969.

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