CH290781A - Process for preparing cycloheptadecene-2,3-one-1. - Google Patents
Process for preparing cycloheptadecene-2,3-one-1.Info
- Publication number
- CH290781A CH290781A CH290781DA CH290781A CH 290781 A CH290781 A CH 290781A CH 290781D A CH290781D A CH 290781DA CH 290781 A CH290781 A CH 290781A
- Authority
- CH
- Switzerland
- Prior art keywords
- cycloheptadecene
- sub
- cycloheptadecanol
- heated
- absence
- Prior art date
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
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/65—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by splitting-off hydrogen atoms or functional groups; by hydrogenolysis of functional groups
- C07C45/66—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by splitting-off hydrogen atoms or functional groups; by hydrogenolysis of functional groups by dehydration
-
- 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
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
- C07C45/673—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by change of size of the carbon skeleton
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Procédé de préparation de la cycloheptadécène-2,3-one-1. Le présent brevet additionnel a pour objet un procédé de préparation de la cyclohepta- décène-2,3-one-1, composé nouveau, bouillant entre 120 et 125 C sous 0,1 mm de Hg; s d4 = 0,918, utilisable en particulier dans l'in dustrie des parfums et répondant, à la for mule
EMI0001.0005
Le procédé du présent brevet est basé sur les mêmes constatations et considérations que celles exposées au brevet principal.
Il est caractérisé en ce que l'on soumet un composé de formule
EMI0001.0007
à une décomposition thermique provoquant l'élimination d'un corps H-0-X avec for mation d'une double liaison entre les atomes de carbone a et P.
Ce procédé peut être exécuté: soit en chauffant de la cycloheptadécanol- 2-one-1 de manière à en provoquer la dés hydratation; soit en soumettant à une pyrolyse un ester de ce cétol.
La déshydratation du cétol est avantageu sement exécutée en présence d'A1203 et en ].'absence d'oxygène, par exemple dans un vide de 0,01 à 4 torr. à une température comprise entre 325 et 352 C.
Les rendements dépassent 80 % du .rende- ment théorique, dès que les meilleures condi tions de travail sont atteintes. Celles-ci consis- tent essentiellement dans un travail à l'abri de l'oxygène, sous un bon vide, en dilution, etc.
Au lieu d'utiliser une cycloheptadécanol- 2-one-1 purifiée, on peut partir du produit brut obtenu par le procédé du brevet N 285682.
Voici, à titre d'exemple, une forme d'exé cution du procédé de la présente invention: On place 3,5 g de cycloheptadécanol-2- one-1 (F. 52 à 53 ) dans un ballon à distiller, muni d'une courte colonne verticale qui peut être chauffée électriquement. On la remplit de petits grains d'oxyde d'aluminium. Le thermo mètre mesure la température au centre du catalyseur. Le ballon à distiller, une fois muni de son tube récepteur, est relié à une pompe à diffusion et plongé dans un bain .d'huile. On chauffe alors la colonne contenant le cataly seur à 340 C par un courant électrique de 1,0 A/220 V. La pression dans le ballon est maintenue à 0,2 à 0,3 torr.
Le bain d'huile est chauffé à 185 . La cycloheptadécanolone dis tille ainsi lentement et les vapeurs, en passant sur le catalyseur, sont déshydratées. La vitesse de distillation est d'environ une goutte par 20 secondes. Le produit déshydraté cristallise dans le ballon récepteur.
On obtient 3,1 g, soit 95 % de la théorie. Dans la trappe avant la pompe, refroidie à -80 , se condense 0,23 g d'eau (au lieu de 0,24 g).
La cycloheptadécène-2,3-one-1 brute fond à 25 à 30 C. Elle possède une bonne odeur musquée et est légèrement jaune.
Process for preparing cycloheptadecene-2,3-one-1. The subject of the present additional patent is a process for preparing cycloheptadecene-2,3-one-1, a new compound, boiling between 120 and 125 C under 0.1 mm of Hg; s d4 = 0.918, usable in particular in the perfume industry and corresponding to the formula
EMI0001.0005
The process of the present patent is based on the same findings and considerations as those set forth in the main patent.
It is characterized in that a compound of formula
EMI0001.0007
to thermal decomposition causing the elimination of an H-0-X body with the formation of a double bond between the a and P carbon atoms.
This process can be carried out: either by heating cycloheptadecanol-2-one-1 so as to cause dehydration thereof; or by subjecting an ester of this ketol to pyrolysis.
The dehydration of the ketol is advantageously carried out in the presence of A1203 and in the absence of oxygen, for example in a vacuum of 0.01 to 4 torr. at a temperature between 325 and 352 C.
The yields exceed 80% of the theoretical yield, as soon as the best working conditions are reached. These consist essentially in working in the absence of oxygen, under a good vacuum, in dilution, etc.
Instead of using a purified cycloheptadecanol-2-one-1, one can start from the crude product obtained by the process of patent No. 285682.
Here is, by way of example, one embodiment of the process of the present invention: 3.5 g of cycloheptadecanol-2-one-1 (F. 52 to 53) are placed in a distillation flask fitted with a 'a short vertical column which can be heated electrically. It is filled with small grains of aluminum oxide. The thermometer measures the temperature at the center of the catalyst. The distillation flask, once fitted with its receiving tube, is connected to a diffusion pump and immersed in an oil bath. The column containing the catalyst is then heated to 340 ° C. with an electric current of 1.0 A / 220 V. The pressure in the flask is maintained at 0.2 to 0.3 torr.
The oil bath is heated to 185. The cycloheptadecanolone thus slowly dissolves and the vapors, passing over the catalyst, are dehydrated. The distillation rate is about one drop per 20 seconds. The dehydrated product crystallizes in the receiving flask.
3.1 g is obtained, ie 95% of theory. In the hatch before the pump, cooled to -80, condenses 0.23 g of water (instead of 0.24 g).
Crude cycloheptadecene-2,3-one-1 melts at 25-30 C. It has a good musky odor and is slightly yellow.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH680994X | 1947-10-07 | ||
CH290781T | 1947-10-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH290781A true CH290781A (en) | 1953-05-15 |
Family
ID=25733061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH290781D CH290781A (en) | 1947-10-07 | 1947-10-07 | Process for preparing cycloheptadecene-2,3-one-1. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH290781A (en) |
-
1947
- 1947-10-07 CH CH290781D patent/CH290781A/en unknown
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