US4895961A
Expired / Lapsed
US
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Preparation of esterified rhodamine dyes
Assignee: BASF SE
•
Filing: 1988-03-11
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Granted: 1990-01-23
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Expires: 2008-03-11
Abstract
Abstract Completely esterified rhodamine dyes of the formula ##STR1## where R, R 2 and R 4 are independently of one another methyl or ethyl, R 1 and R 3 are independently of one another hydrogen, methyl or ethyl, R 5 and R 6 are independently of one another hydrogen or methyl and A.sup.⊖ is an anion, are prepared from compounds of the formula II ##STR2## or from the corresponding water addition products by esterification with dialkyl sulfates in solvents by using γ-butyrolactone, alkylene carbonates, dialkyl carbonates, methoxypropyl acetate or dialkyl phthalates as solvent and working in the presence of an excess of a base, based on dialkyl sulfate.
Inventors
- 👤 Karl Schmeidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:59
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
134 words
A process for preparing a completely esterified rhodamine dye of the formula I where R, R 2 and R 4 are identical or different and each is independently of the others methyl or ethyl, R 1 and R 3 are identical or different and each is independently of the other hydrogen, methyl or ethyl, R 5 and R 6 are identical or different and each is independently of the other hydrogen or methyl, and A.sup.⊖ is an anion, from a compound of the formula II or from a corresponding water addition product by esterification with a dialkyl sulfate in a solvent, which comprises using γ-butyrolactone, alkylene carbonate, dialkyl carbonate, methoxypropyl acetate or a dialkyl phthalate as solvent and working in the presence of a molar excess of a base, based on the dialkyl sulfate.
Claim 2
Dependent Claim
134 words
A process for preparing a completely esterified rhodamine dye of the formula I where R, R 2 and R 4 are identical or different and each is independently of the others methyl or ethyl, R 1 and R 3 are identical or different and each is independently of the other hydrogen, methyl or ethyl, R 5 and R 6 are identical or different and each is independently of the other hydrogen or methyl, and A.sup.⊖ is an anion, from a compound of the formula II or from a corresponding water addition product by esterification with a dialkyl sulfate in a solvent, which comprises using γ-butyrolactone, alkylene carbonate, dialkyl carbonate, methoxypropyl acetate or a dialkyl phthalate as solvent and working in the presence of a molar excess of a base, based on the dialkyl sulfate.
Claim 3
Dependent Claim
38 words
A process as claimed in claim 1, wherein the solvent used is γ-butyrolactone, ethylene carbonate, 1,2-propylene carbonate, 1,2-n-butylene carbonate, 1,2-isobutylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate, dimethyl phthalate, diethyl phthalate, dipropyl phthalate, dibutyl phthalate or dioctyl phthalate.
Claim 4
Dependent Claim
13 words
A process as claimed in claim 1, wherein the solvent used is γ-butyrolactone.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1, wherein the solvent used is an alkylene carbonate.
Claim 6
Dependent Claim
15 words
A process as claimed in claim 1, wherein the solvent used is a dialkyl carbonate.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is methoxypropyl acetate.
Claim 8
Dependent Claim
15 words
A process as claimed in claim 1, wherein the solvent used is a dialkyl phthalate.
Claim 9
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is ethylene carbonate.
Claim 10
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is 1,2-propylene carbonate.
Claim 11
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is 1,2-n-butylene carbonate.
Claim 12
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is 1,2-iso-butylene carbonate.
Claim 13
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is dimethyl carbonate.
Claim 14
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is diethyl carbonate.
Claim 15
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is dipropyl carbonate.
Claim 16
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is dimethyl phthalate.
Claim 17
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is diethyl phthalate.
Claim 18
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is dipropyl phthalate.
Claim 19
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is dibutyl phthalate.
Claim 20
Dependent Claim
14 words
A process as claimed in claim 1, wherein the solvent used is dioctyl phthalate.
Claim 21
Dependent Claim
43 words
A process as claimed in any of claims 1, 2 or 3, wherein the base used is an alkali metal hydroxide or oxide, an alkaline earth metal hydroxide or oxide, a basic aluminum oxide or a tertiary organic amine containing sterically hindered nitrogen.
Claim 22
Dependent Claim
16 words
A process as claimed in claim 20, wherein the base used is an alkali metal hydroxide.
Claim 23
Dependent Claim
16 words
A process as claimed in claim 20, wherein the based used is an alkali metal oxide.
Claim 24
Dependent Claim
17 words
A process as claimed in claim 20, wherein the base used is an alkaline earth metal hydroxide.
Claim 25
Dependent Claim
17 words
A process as claimed in claim 20, wherein the base used is an alkaline earth metal oxide.
Claim 26
Dependent Claim
16 words
A process as claimed in claim 20, wherein the base used is a basic aluminum oxide.
Claim 27
Dependent Claim
21 words
A process as claimed in claim 20, wherein the base used is a basic tertiary organic amine containing sterically hindered nitrogen.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |