Process for the preparation of quaternary imidazoline derivatives
Abstract
Abstract QUATERNARY IMIDAZOLINE DERIVATIVES ARE PREPARED IN HIGH YIELD BY QUATERNIZING A BASIC TERTIARY IMIDAZOLINE WITH A HALOGEN-SUBSTITUTED ALIPHATIC ORGANIC CARBOXYLIC OR SULFONIC ACID OR A SULTONE, AT A TEMPERATURE WITHIN THE RANGE OF 40*C. TO 90*C., UNDER MILDLY ALKALINE CONDITIONS, BY ADDING ALKALI IF NECESSARY AT SUCH A RATE AS TO MAINTAIN THE PH OF THE REACTION MIXTURE AT A VALUE SUCH THAT SAMPLES THEREOF DILUTED WITH WATER TO 10%-SOLIDS FALL WITHIN THE PH RANGE OF 7-9, AND PREFERABLY 7 TO 7.5, ANY REMAINING AMOUNT OF THE PREDETERMINED AMOUNT OF ALKALI BEING ADDED SUBSEQUENTLY WITHOUT REGARD TO ITS EFFECT UPON THE PPH VALUE, BUT THE REACTION BEING CONTINUED WITHIN THE AFORESAID TEMPERATURE RANGE UNTIL A CONSTANT PH VALUE IS ATTAINED. IN THIS WAY UNDER OPTIMUM CONDITIONS YIELDS EVEN IN EXCESS OF 90% CAN FREQUENTLY BE SECURED.
Inventors
- 👤 M Bloch
- 👤 A Koebner
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |