Patent US3822065A successfully refreshed from Google Patents.
Patent US2734066A successfully refreshed from Google Patents.
US2734066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of dfflydro-
Assignee: —
•
Filing: —
•
Granted: 1956-02-07
•
Expires: 1973-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:10
CPC Classifications
C; C07; C07J; C07J1/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS FOR THE PREPARATION OF 4-DIHYDROTESTOSTERONE WHICH COMPRISES OXIDIZING WITH CHROMIC ACID THE CYANOHYDRIN OF ANDROSTAN-3-OL-17-ONE TO FORM ANDROSTAN17-CYAN-17-OL-3-ONE; TREATING THIS INTERMEDIATE IN THE PRESENCE OF AN ACID CATALYST WITH AN ACETALYSING AGENT, SELECTED FROM THE GROUP CONSISTING OF ORTHOFORMIC ACID ESTERS, ARYL ALCOHOLS AND ALIPHATIC GLYCOLS, THEREBY OBTAINING AS A SECOND INTERMEDIATE A 3-KETAL DERIVATIVE OF THE ANDROSTAN-17-CYAN-17-OL-3-ONE; SUBJECTING THE SECOND INTERMEDIATE COMPOUND TO THE CNCOMITANT ACTION OF A BOILING ALIPHATIC ALCOHOL OF THE SERIES CONTAINING 2 TO 5 CARBON ATOMS AND AN ALKALI METAL TO ELIMINATE THE CN GROUP IN 17-POSITION AND TO FORM IN THE ALKALINE ALCOHLIC SOLUTION A 3-KETAL DERIVATIVE OF 4-DIHYDROTESTOSTERONE, ACIDIFYING THE SAID BOILING ALKALINE ALCOHOLIC SOLUTION WITH A MINERAL ACID AND DILUTING THE SAME WITH BOILING WATER TO OBTAIN 4-DIHYDROTESTOSTERONE.
Claim 2
Dependent Claim
128 words
A PROCESS FOR THE PREPARATION OF 4-DIHYDROTESTOSTERONE WHICH COMPRISES OXIDIZING WITH CHROMIC ACID THE CYANOHYDRIN OF ANDROSTAN-3-OL-17-ONE TO FORM ANDROSTAN17-CYAN-17-OL-3-ONE; TREATING THIS INTERMEDIATE IN THE PRESENCE OF AN ACID CATALYST WITH AN ACETALYSING AGENT, SELECTED FROM THE GROUP CONSISTING OF ORTHOFORMIC ACID ESTERS, ARYL ALCOHOLS AND ALIPHATIC GLYCOLS, THEREBY OBTAINING AS A SECOND INTERMEDIATE A 3-KETAL DERIVATIVE OF THE ANDROSTAN-17-CYAN-17-OL-3-ONE; SUBJECTING THE SECOND INTERMEDIATE COMPOUND TO THE CNCOMITANT ACTION OF A BOILING ALIPHATIC ALCOHOL OF THE SERIES CONTAINING 2 TO 5 CARBON ATOMS AND AN ALKALI METAL TO ELIMINATE THE CN GROUP IN 17-POSITION AND TO FORM IN THE ALKALINE ALCOHLIC SOLUTION A 3-KETAL DERIVATIVE OF 4-DIHYDROTESTOSTERONE, ACIDIFYING THE SAID BOILING ALKALINE ALCOHOLIC SOLUTION WITH A MINERAL ACID AND DILUTING THE SAME WITH BOILING WATER TO OBTAIN 4-DIHYDROTESTOSTERONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-06 | 1959-08-08 | 1960-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-06 | 1963-08-08 | 1964-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-06 | 1967-08-08 | 1968-02-07 | $7700.00 | Window Closed / Lapsed |