US3875226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acid halides
Assignee: Dow Chemical Co
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Filing: 1969-10-17
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Granted: 1975-04-01
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Expires: 1989-10-17
Abstract
Abstract halides comprising reacting by contacting in the liquid phase (a) sulfur dioxide and (b) an organic compound bearing at least one allylic or benzylic trihalomethyl group; the halogen of said trihalomethyl group being fluoro, chloro, bromo or mixtures thereof; said process being conducted in the presence of a small but catalytic amount of BF3, BF3.etherate, SnCl4 or ZnCl2 and at a temperature of from about 50*C. to about 125*C.
Inventors
- 👤 Harold E Doorenbos
- 👤 Darell D Toner
- 👤 Linda G Calhoun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:21
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A PROCESS FOR PREPARING ORGANIC ACID HALIDES COMPRISING REACTING BY CONTACTING IN THE LIQUID PHASE (A) SULFUR DIOXIDE AND (B) AN ORGANIC COMPOUND BEARING AT LEAST ONE ALLYLIC OR BENZYLIC TRIHALOMETHYL GROUP; THE HALOGEN OF SAID TRIHALOMETHYL GROUP BEING FLUORO, CHLORO, BROMO OR MIXTURES THEREOF; SAID PROCESS BEING CONDUCTED IN THE PRESENCE OF A SMALL BUT CATALYTIC AMOUNT OF BF3, BF3, ETHERATE, SNCL4 OR ZNCL2 AND AT A TEMPERATURE OF FROM ABOUT 50*C TO ABOUT 125*C.
Claim 2
Dependent Claim
76 words
A PROCESS FOR PREPARING ORGANIC ACID HALIDES COMPRISING REACTING BY CONTACTING IN THE LIQUID PHASE (A) SULFUR DIOXIDE AND (B) AN ORGANIC COMPOUND BEARING AT LEAST ONE ALLYLIC OR BENZYLIC TRIHALOMETHYL GROUP; THE HALOGEN OF SAID TRIHALOMETHYL GROUP BEING FLUORO, CHLORO, BROMO OR MIXTURES THEREOF; SAID PROCESS BEING CONDUCTED IN THE PRESENCE OF A SMALL BUT CATALYTIC AMOUNT OF BF3, BF3, ETHERATE, SNCL4 OR ZNCL2 AND AT A TEMPERATURE OF FROM ABOUT 50*C TO ABOUT 125*C.
Claim 3
Dependent Claim
19 words
The process defined in claim 1 wherein each trihalomethyl group is trifluoromethyl and the catalyst is BF3 or BF3.etherate.
Claim 4
Dependent Claim
26 words
The process defined in claim 1 wherein the catalyst is present in an amount of from 0.01 to 1 percent based on the weight of (b).
Claim 5
Dependent Claim
14 words
The process defined in claim 1 wherein the reaction is conducted in a solvent.
Claim 6
Dependent Claim
12 words
The process deFined in claim 4 wherein said solvent is sulfur dioxide.
Claim 7
Dependent Claim
12 words
The process defined in claim 1 wherein the reaction pressure is autogenous.
References Cited (Backward Citations)
US3411886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |