US4436668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of carbonates
Assignee: BASF SE
•
Filing: 1981-05-28
•
Granted: 1984-03-13
•
Expires: 2001-05-28
Abstract
Abstract Carbonates are prepared by reacting carbamic acid esters with alcohols at above 140° C., the ammonia formed being stripped from the reaction mixture during the reaction by passing an inert gas or vapor therethrough. The carbonates obtainable by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents and plastics.
Inventors
- 👤 Wolfgang Harder
- 👤 Franz Merger
- 👤 Friedrich Towae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:24
CPC Classifications
C; C07; C07C; C07C68/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
In a process for the preparation of a carbonate of the formula ##STR4## where R 1 and R 2 are identical or different and each is an aralkyl group of 7 to 12 carbon atoms, an alkenyl group of 2 to 12 carbon atoms, a cycloalkyl group of 5 to 8 carbon atoms or an alkyl group of 1 to 18 carbon atoms, by reacting a carbamic acid ester with an alcohol, the improvement which comprises: reacting a carbamic acid ester of the formula ##STR5## where R 2 has the above meanings, with an alcohol of the formula R.sup.1 --OH III where R 1 has the above meanings, at a temperature above 140° C., the ammonia formed being stripped from the reaction mixture during the reaction by passing an inert gas therethrough.
Claim 2
Dependent Claim
132 words
In a process for the preparation of a carbonate of the formula ##STR4## where R 1 and R 2 are identical or different and each is an aralkyl group of 7 to 12 carbon atoms, an alkenyl group of 2 to 12 carbon atoms, a cycloalkyl group of 5 to 8 carbon atoms or an alkyl group of 1 to 18 carbon atoms, by reacting a carbamic acid ester with an alcohol, the improvement which comprises: reacting a carbamic acid ester of the formula ##STR5## where R 2 has the above meanings, with an alcohol of the formula R.sup.1 --OH III where R 1 has the above meanings, at a temperature above 140° C., the ammonia formed being stripped from the reaction mixture during the reaction by passing an inert gas therethrough.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1, wherein the reaction is carried out in the presence of a tertiary amine or amidine as the catalyst.
Claim 4
Dependent Claim
50 words
A process as claimed in claim 1, wherein the reaction is carried out in the presence of a catalytic amount of a compound of a metal chosen from the elements of groups Ia, Ib, IIa, IIb, IIIa, IIIb, IVa, IVb, Va, Vb, VIb, VIIb and VIIIb of the periodic table.
Claim 5
Dependent Claim
29 words
A process as claimed in claim 1, wherein the reaction is carried out with from 0.9 to 50 moles of starting material III per mole of starting material II.
Claim 6
Dependent Claim
19 words
A process as claimed in claim 1, wherein the reaction is carried out at from 140° to 260° C.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 1, wherein the reaction is carried out at from 140° to 230° C.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 1, wherein the reaction is carried out under a pressure of from 0.1 to 60 bar.
Claim 9
Dependent Claim
34 words
A process as claimed in claim 1, wherein the reaction is carried out in the presence of a solvent which is inert under the reaction conditions and in which ammonia is only sparingly soluble.
Claim 10
Dependent Claim
37 words
A process as claimed in claim 1, wherein the reaction is carried out using as the stripping medium an inert gas in an amount of 0.01-10 mole% per minute, based on ammonia present in the reaction mixture.
Claim 11
Dependent Claim
48 words
A process as claimed in claim 1, wherein the reaction is carried out in the presence of a tertiary amine or amidine as a catalyst having from 0.0001 to 1 equivalent of amino or amidine group in the molecule of the catalyst, per mole of starting material II.
Claim 12
Dependent Claim
67 words
A process as claimed in claim 1, wherein the reaction is carried out with from 0.0001 to 1 equivalent of a compound of a metal selected from the elements of groups Ia, IB, IIa, IIb, IIIa, IIIb, IVa IVb, Va, Vb, VIb, VIIb and VIIIb of the periodic table as a catalyst, providing from 0.0001 to 1 equivalent of metal cation per mole of carbamic acid ester.
Claim 13
Dependent Claim
16 words
A process as claimed in claim 1 wherein nitrogen is used as the inert stripping gas.
References Cited (Backward Citations)
US2834799A
Cited
US4331610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |