Patent US3868423A successfully refreshed from Google Patents.
US3868423A
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Process for preparing beta,beta{40 -bis-(3,5-dibromo-4-hydroxy-phenyl)-propane
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1971-12-22
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Granted: 1975-02-25
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Expires: 1991-12-22
Abstract
Abstract Beta,beta''-bis-(3,5-dibromo-4-hydroxyphenol)-propane is prepared by a bromination reaction in methanol as solvent in the presence of chlorine, the amount of chlorine being brought to excess after the addition of bromine has ceased.
Inventors
- 👤 Fernando Montanari
- 👤 Benedetto Calcagno
- 👤 Luciano Conti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:20
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/62
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A PROCESS FOR THE MANUFACTURE OF BETA, BETA''-BIS(3,5DIBROMO-4-HYDROXYPHENYL)-PROPANE BY THE BROMINATION OF BETA, BETA''-BIS-(4-HYDROXYPHENYL)-PROPANE WHICH COMPRISES THE STEPS OF (A) SUPPLYING LIQUID BROMINE AND GASEOUS CHLORINE TO A SOLUTION OF BETA, BETA''-BIS-(4-HYDROXYPHENYL)-PROPANE DISSOLVED IN METHANOL AT A RATE SUCH THAT THE TOTAL QUANTITY OF BROMINE ADDED IS MAINTAINED IN LARGE EXCESS OF THE TOTAL QUANTITY OF CHLORINE ADDED; (B) TERMINATING THE SUPPLYING OF BROMINE; (C) CONTINUING THE SUPPLYING OF CHLORINE UNTIL THE TOTAL MOLAR QUANTITY OF CHLORINE ADDED IS IN MODERATE EXCESS TO THE TOTAL MOLAR QUANTITY OF BROMINE ADDED; AND (D) RECOVERING BETA, BETA''-(3,5-DIBROMO-4-HYDROXYPHENYL(-PROPANE FROM THE PRODUCTS OF THE REACTION, WHEREIN IN STEPS (A), (B) AND (C) THE TEMPERATURE IS MAINTAINED AT LEVELS NOT EXCEEDING 30*C.
Claim 2
Dependent Claim
117 words
A PROCESS FOR THE MANUFACTURE OF BETA, BETA''-BIS(3,5DIBROMO-4-HYDROXYPHENYL)-PROPANE BY THE BROMINATION OF BETA, BETA''-BIS-(4-HYDROXYPHENYL)-PROPANE WHICH COMPRISES THE STEPS OF (A) SUPPLYING LIQUID BROMINE AND GASEOUS CHLORINE TO A SOLUTION OF BETA, BETA''-BIS-(4-HYDROXYPHENYL)-PROPANE DISSOLVED IN METHANOL AT A RATE SUCH THAT THE TOTAL QUANTITY OF BROMINE ADDED IS MAINTAINED IN LARGE EXCESS OF THE TOTAL QUANTITY OF CHLORINE ADDED; (B) TERMINATING THE SUPPLYING OF BROMINE; (C) CONTINUING THE SUPPLYING OF CHLORINE UNTIL THE TOTAL MOLAR QUANTITY OF CHLORINE ADDED IS IN MODERATE EXCESS TO THE TOTAL MOLAR QUANTITY OF BROMINE ADDED; AND (D) RECOVERING BETA, BETA''-(3,5-DIBROMO-4-HYDROXYPHENYL(-PROPANE FROM THE PRODUCTS OF THE REACTION, WHEREIN IN STEPS (A), (B) AND (C) THE TEMPERATURE IS MAINTAINED AT LEVELS NOT EXCEEDING 30*C.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the temperature is maintained at between 20* and 25*C throughout steps (a), (b) and (c).
Claim 4
Dependent Claim
28 words
A process according to claim 5, wherein the beta,beta''-bis-(3,5-dibromo-4-hydroxyphenyl)-propane is recovered from the products of reaction bh dilution with water and cooling, followed by, finally, recrystallization in isopropanol
Claim 5
Dependent Claim
29 words
A process according to claim 1 wherein the total number of moles of bromine added is twice the number of moles of beta, beta''-bis-(4-hydroxyphenyl)-propane initially present in said solution.
Claim 6
Dependent Claim
30 words
A process according to claim 1 wherein at the end of step (a) the total molar quantity of chlorine added does not exceed one-half the total quantity of bromine added.
Claim 7
Dependent Claim
24 words
A process according to claim 1 wherein said moderate excess of chlorine is up to 10percent greater than the total molar quantity of bromine.
References Cited (Backward Citations)
GB900136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |