US4460799A
Expired / Lapsed
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Process for the preparation of ortho-hydroxybenzyl alcohols
Assignee: Saint Gobain Isover SA France
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Filing: 1982-06-23
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Granted: 1984-07-17
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Expires: 2002-06-23
Abstract
Abstract This invention relates to a process for the selective preparation of ortho-hydroxybenzyl alcohols and, in particular, ortho-hydroxybenzyl alcohol. According to the invention, the reaction of a phenol with an aldehyde in an initially anhydrous medium and in the presence of a catalytic amount of a metal phenate, results in the selective production of ortho-hydroxybenzyl alcohols.
Inventors
- 👤 Robert Perrin
- 👤 Roger Fugier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:18
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/115
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A process for the selective preparation of ortho-hydroxy benzyl alcohol, which comprises reacting a phenol with formaldehyde in an initially anhydrous reaction medium in the presence of an aluminum or gallium phenate, with a catalyst:phenol molar ratio of at least 0.1:100, at about 50° to 150° C. to form a reaction mixture containing unreacted phenol and ortho-hydroxy benzyl alcohol, and separating the ortho-hydroxy benzyl alcohol from the remaining phenol.
Claim 2
Dependent Claim
69 words
A process for the selective preparation of ortho-hydroxy benzyl alcohol, which comprises reacting a phenol with formaldehyde in an initially anhydrous reaction medium in the presence of an aluminum or gallium phenate, with a catalyst:phenol molar ratio of at least 0.1:100, at about 50° to 150° C. to form a reaction mixture containing unreacted phenol and ortho-hydroxy benzyl alcohol, and separating the ortho-hydroxy benzyl alcohol from the remaining phenol.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein the aldehyde is formaldehyde or paraformaldehyde.
Claim 4
Dependent Claim
13 words
The process according to claim 2 wherein the formaldehyde is in gaseous form.
Claim 5
Dependent Claim
18 words
The process according to claim 1 wherein the aluminum phenate is aluminum phenate, aluminum hydroxydiphenate or aluminum triphenate.
Claim 6
Dependent Claim
15 words
The process according to claim 1 wherein the catalyst is prepared in the reaction medium.
Claim 7
Dependent Claim
17 words
The process according to claim 1 wherein the phenol and formaldehyde are used in a stoichiometric ratio.
Claim 8
Dependent Claim
13 words
The process according to claim 1 wherein the ortho-hydroxybenzyl alcohol produced is salignol.
Claim 9
Dependent Claim
23 words
The process according to claim 1 wherein the reaction products are separated from the remaining phenol by an aqueous phase-organic phase extraction process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |