GB442120A - A process for manufacturing novel cyclic ketones - Google Patents
A process for manufacturing novel cyclic ketonesInfo
- Publication number
- GB442120A GB442120A GB12605/34A GB1260534A GB442120A GB 442120 A GB442120 A GB 442120A GB 12605/34 A GB12605/34 A GB 12605/34A GB 1260534 A GB1260534 A GB 1260534A GB 442120 A GB442120 A GB 442120A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cyclic ketones
- novel cyclic
- acid
- manufacturing novel
- concentrated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/56—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds
- C07C45/57—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom
- C07C45/59—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom in five-membered rings
Abstract
Alkylcyclopentenones are prepared by treating alkylated butyrolactones with concentrated inorganic acids, preferably at elevated temperature. If desired, the corresponding unsaturated acids or esters are employed as starting material, being first converted by the acid treatment into the lactone. The products are useful as perfumes. Examples are given of the preparation of hexylcyclopentenone (dihydroisojasmone) by heating undecalactone, undecylenic acid or its ethyl ester with concentrated sulphuric acid, to which sulphur trioxide or phosphorus pentoxide may be added. The production of butylcyclopentenone from amylbutylrolactone is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR765515T | 1933-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB442120A true GB442120A (en) | 1936-02-03 |
Family
ID=10007724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12605/34A Expired GB442120A (en) | 1933-12-15 | 1934-04-26 | A process for manufacturing novel cyclic ketones |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE667156C (en) |
| FR (1) | FR765515A (en) |
| GB (1) | GB442120A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1058052B (en) * | 1956-08-13 | 1959-05-27 | Hoffmann La Roche | Process for the preparation of cyclopentenyl- or cyclopentyl-substituted ketones |
| IT1200400B (en) * | 1985-03-05 | 1989-01-18 | Montedison Spa | PROCEDURE FOR THE PREPARATION OF 2-ALCHIL CICLOPENT-2-ENONI |
-
1933
- 1933-12-15 FR FR765515D patent/FR765515A/en not_active Expired
-
1934
- 1934-01-27 DE DEM126309D patent/DE667156C/en not_active Expired
- 1934-04-26 GB GB12605/34A patent/GB442120A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR765515A (en) | 1934-06-11 |
| DE667156C (en) | 1938-11-07 |
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