DE1249262B - Process for the preparation of sodium cyclohexylamidosulfonate - Google Patents

Process for the preparation of sodium cyclohexylamidosulfonate

Info

Publication number
DE1249262B
DE1249262B DE1966F0050356 DEF0050356A DE1249262B DE 1249262 B DE1249262 B DE 1249262B DE 1966F0050356 DE1966F0050356 DE 1966F0050356 DE F0050356 A DEF0050356 A DE F0050356A DE 1249262 B DE1249262 B DE 1249262B
Authority
DE
Germany
Prior art keywords
sodium
cyclohexylamidosulfonate
preparation
cyclohexylamine
cyclohexylammonium
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.)
Pending
Application number
DE1966F0050356
Other languages
German (de)
Inventor
Frankfurt/M. Dr. Rudolf Kohlhaas Frankfurt/M.-Höchst Dr. Dieter Wick Frankfurt/M Dr Ernst Dönges
Original Assignee
Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius S. Brüning, Frankfurt/M
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius S. Brüning, Frankfurt/M filed Critical Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius S. Brüning, Frankfurt/M
Priority to DE1966F0050356 priority Critical patent/DE1249262B/en
Priority to DEP1268A priority patent/DE1268141B/en
Publication of DE1249262B publication Critical patent/DE1249262B/en
Priority to NL6713209A priority patent/NL6713209A/xx
Priority to AT891267A priority patent/AT276349B/en
Priority to GR670137066A priority patent/GR37066B/en
Priority to FR123109A priority patent/FR1539415A/en
Priority to BE704651D priority patent/BE704651A/xx
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C303/00Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
    • C07C303/34Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfuric acids
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L27/00Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
    • A23L27/30Artificial sweetening agents

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

(UNDESREPUBLIK DEUTSCHLAND(UNDESREPUBLIC OF GERMANY

DEUTSCHESGERMAN

PATENTAMTPATENT OFFICE

AUSLEGESCHRIFTEDITORIAL

Int Cl ·Int Cl

C07cC07c

Deutsche Kl. 12 ο-2:German class 12 ο-2:

Nummer 1249262Number 1249262

Aktenzeichen. F 50356 IV b/12 οFile number. F 50356 IV b / 12 ο

Anmeldetag 4 Oktober 1966 Filing date October 4, 1966

Auslegetag 7 September 1967Opening day 7 September 1967

Gegenstand der Erfindung ist ein verbessertes Verfahren zum Herstellen von Natnumcyclohexylamidosulfonat durch Umsetzen von Cyclohexylamin und Amidosulfonsaure und Hydrolysieren des erhaltenen Cyclohexylammonium - N - cyclohexylamidosulfonats Natnumcyclohexylanunosulfonat dient als SüßstoffThe invention relates to an improved method for the production of sodium cyclohexylamidosulfonate by reacting cyclohexylamine and Amidosulfonic acid and hydrolyzing the resulting cyclohexylammonium-N-cyclohexylamidosulfonate Natnumcyclohexylanunosulfonat serves as a sweetener

Es sind Verfahren zum Herstellen von Natnumcyclohexylamidosulfonat bekannt bei denen Amidosulfonsaure bei 130 bis 1600C mit Cyclohexylamin neutralisiert, das so erhaltene Cyclohexylammoniumamidosulfonat mit weiterem Cyclohexylamm unter Abspaltung von Ammoniak zu Cyclohexylammomum-N-cyclohexylamidosulfonat bei 180 bis 1900C kondensiert und dieses mit wäßriger Natronlauge in Natrmmcyclohexylamidosulfonat und Cyclohexylamin hydrolytisch zerlegt wirdThere are where neutralizing sulfamic acid at 130 to 160 0 C with cyclohexylamine method for producing Natnumcyclohexylamidosulfonat known, the Cyclohexylammoniumamidosulfonat thus obtained with further Cyclohexylamm with elimination of ammonia to Cyclohexylammomum-N-cyclohexylamidosulfonat at 180 to 190 0 C condenses and this with aqueous sodium hydroxide is hydrolytically decomposed into sodium cyclohexylamidosulfonate and cyclohexylamine

Bei diesen bekannten Verfahren wird die Neutralisation entweder in Gegenwart eines hochsiedenden organischen Losungsmittels oder mit aquimolaren Mengen Cyclohexylamin und Amidosulfonsaure ohne Verwendung eines Losungsmittels oder mit überschüssigem Cyclohexylamin als Losungsmittel durchgeführt Wegen der erforderlichen Temperatur fuhrt die Umsetzung zu einer Reihe von Nebenprodukten, so daß das Endprodukt gelblich bis braun gefärbt ist und mehreren Reinigungsoperationen unterworfen werden muß Die Bildung von Ν,Ν'-Dicyclohexylsulfamid m Mengen von 7 bis 10 % fuhrt zu erbeblichen Ausbeuteverlusten Das Cyclohexylamm muß trocken und rein sein, so daß das nach der Hydrolyse beim Eindampfen des Endprodukts zurückgewonnene Cyclohexylamm getrocknet und durch Destillieren gereinigt werden mußIn these known processes, the neutralization either in the presence of a high-boiling organic solvent or with equimolar Amounts of cyclohexylamine and sulfonic acid without using a solvent or with excess Cyclohexylamine carried out as a solvent because of the required temperature leads the conversion to a number of by-products, so that the end product is yellowish to brown in color and must be subjected to several cleaning operations. The formation of Ν, Ν'-dicyclohexylsulfamide m amounts of 7 to 10% leads to hereditary problems Loss of yield The cyclohexylamm must be dry and pure, so that after the hydrolysis Evaporation of the final product, recovered cyclohexylamm, dried and purified by distillation must become

Es wurde nun überraschenderweise gefunden, daß man zu einem sehr reinen Natnumcyclohexylamido- 3b sulfonat gelangt, wenn man die Umsetzung des Cyclohexylamine mit Amidosulfonsaure in der ersten Verfahrensstufe in wäßriger Losung vornimmt, die erhaltene wäßrige Losung von Cyclohexylammonrumamidosulfonat zur Trockne eindampft, in bekannter Weise das Cyclohexylammoniumamidosulfonat mit Cyclohexylamin kondensiert und das erhaltene Cyclohexylammonium-N-cyclohexylammo&ulfonat mit wäßriger Natronlauge hydrolysiertIt has now surprisingly been found that a very pure sodium cyclohexylamido-3b sulfonate arrives if you react the cyclohexylamine with sulfamic acid in the first stage of the process makes the obtained in aqueous solution aqueous solution of cyclohexylammonrumamidosulfonate evaporated to dryness, in known Send the cyclohexylammonium amido sulfonate with Cyclohexylamine condenses and the resulting cyclohexylammonium-N-cyclohexylammonate hydrolyzed with aqueous sodium hydroxide solution

Die Neutralisation kann bei Zimmertemperatur vorgenommen werden Zur Erhöhung der Löslichkeit des Cyclohexylamm oniumamidosulfonats ist es jedoch zweckmäßig, die Umsetzung bei 30 bis 500C vorzunehmen Eine weitere Temperaturerhöhung ist möglich, bringt aber im allgemeinen keine Vorteile mehrThe neutralization can be carried out at room temperature to increase the solubility of the Cyclohexylamm oniumamidosulfonats however, it is expedient to carry out the reaction at 30 to 50 0 C a further temperature increase is possible, but will generally afford no advantages more

Bei einer besonders vorteilhaften Ausfuhrungsform des erfindungsgemaßen Verfahrens verwendet man als Verfahren zum Herstellen /on Natriumcyclohexylam'idosulfonatIn a particularly advantageous embodiment of the method according to the invention is used as Process for the preparation of sodium cyclohexyl amidosulfonate

AnmelderApplicant

Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius & Efruning, Frankfur /MFarbwerke Hoechst Aktiengesellschaft formerly Meister Lucius & Efruning, Frankfur / M

i i

Als Erfindet benannt iNamed as inventor i

Di Ernst Donges, Frankfurt/M , Dr Rudolf Kohlhaas, Frankfurt/M.-Hochst, Dr Dieter Wick, Frankfurt/Di Ernst Donges, Frankfurt / M, Dr Rudolf Kohlhaas, Frankfurt / M.-Hochst, Dr Dieter Wick, Frankfurt /

1M 1 M.

Einsatzprodukt fur die erste Verfahrensstufe ein Gemisch aus gleichen Gewichtsteilen Cyclohexylamin und Wasser Dieses Gemisch bildet ein Azeotrop, es fallt beim Eindampfen der Losung von Natnumcyclohexylamidosulfonat nach der Hydrolyse zwanglaufig an, so daß das Destillat aus diesem Prozeß unmitteJbar als Einsatzgemisch fur die erste Verfahrensstufe /erwendet werden kann, wobei keine Reinigung oder Konzentrierung erforderlich ist Die beschuebene Verfahrensweise ist besonders gut durchfuhrbar, wenn man zur Hydrolyse des Cyclohexyllammonium-N-cyclohexylamidosulfonats mit Natronlauge nur so viel Wasser einsetzt, daß das Reaktionsprodukt bei 90 bis 100° C gerade gelost bleibtFeedstock for the first process stage is a mixture from equal parts by weight of cyclohexylamine and water This mixture forms an azeotrope, it falls when the solution of sodium cyclohexylamidosulfonate is evaporated inevitably after the hydrolysis, so that the distillate from this process is inevitable can be used as a feed mixture for the first process stage /, with no purification or Concentration is required The procedure can be carried out particularly well if the hydrolysis of the cyclohexyllammonium-N-cyclohexylamidosulfonate is used with sodium hydroxide solution only so much water uses that the reaction product at 90 to 100 ° C just remains dissolved

AusfuhrungsbeispielExemplary embodiment

99 g Cyclohexylamin werden
vermischt und untei Ruhren Ibei
fester Amidosulfonsaure verset Tempei atur der Losung infolge warme etwas erhöht Die Losung kuum zur Trockene eingeengt 196|f CyclohexylammoniumamidosulfoE mit 15 g Cyclohexylamin gut ver 1-1-Viel hals-Kolben unter kräftigejm Ruhren bis ζ ar Schmelze erwärmt, wobei das p|rodukt bei 135° C flussig und bei 1500C vollkommen klar wird. Bei 170° C wird dann die Schmelze unter standigem Rühre η tropfenweise mit 89 g Cyclohexylamin versetzt Im Verlauf der Reaktion wird die Temperatur auf 180 bis
99 g of cyclohexylamine will be
mixed and mixed
Solid amidosulfonic acid sets the temperature of the solution slightly higher as a result of the warmth. The solution is concentrated to dryness 135 ° C liquid and at 150 0 C is completely clear. At 170 ° C., 89 g of cyclohexylamine are then added dropwise to the melt with constant stirring η. In the course of the reaction, the temperature increases to 180 bis

709 640/574709 640/574

11t 100 ml Wasser ibis 50° C mit 97 g wobei sich die Her Neutrahsationswird dann im Va-5(1 Mol) trockenen its werden dann iihrt und in einem11t 100 ml water up to 50 ° C with 97 g whereby the heart will be Neutrahsations then in Va-5 (1 Mol) dry bits are then preserved and rolled into one

1850C erhöht Nach IV8 bis 2 Stunden hat sich das Cyclohexylamm unter Ammoniakentwicklung umgesetzt, und die Reaktionsmasse wird noch 20 Minuten bei 185CC nachgeruhrt Nach Abkühlung auf 1300C wird das vollkommen farblose, feste Reaktionsprodukt mit einer Losung von 42 g NaOH in 110 ml Wasser versetzt und 1 Stunde bei 90 bis 1000C hydrolysiert Danach kann das Cyclohexylamm-Wasser-Gemisch aus dem Reaktionskolben als Azeotrop abdestilliert und wieder fur die Herstellung der ersten Stufe eingesetzt werden Die Extraktion des rohen Natnumcyclohexylamidosulfonats mit Methylenchlond erfolgt in dem gleichen Reaktionsgefaß unter Ruhren. Nach der Druckfiltration fallt ein farbloses Produkt an, das noch mit Aktivkohle geklart und aus Wasser umkristallisiert wird. Die Ausbeute an reinem, umknstalhsiertem Natnutncyclohexylamidosulfonat betragt etwa 88%, bezogen auf die eingesetzte Amidosulfonsaure 185 0 C increased after IV 8-2 hours, the Cyclohexylamm has reacted with evolution of ammonia, and the reaction mass is still 20 minutes at 185 C C subsequently stirred After cooling to 130 0 C, the completely colorless solid reaction product with a solution of 42 g NaOH added in 110 ml of water and hydrolyzed for 1 hour at 90 to 100 ° C. Thereafter, the cyclohexylammon-water mixture can be distilled off from the reaction flask as an azeotrope and used again for the preparation of the first stage Reaction vessel with stirring. After pressure filtration, a colorless product is obtained, which is clarified with activated charcoal and recrystallized from water. The yield of pure, kneaded sodium cyclohexyl amido sulfonate is about 88%, based on the amidosulfonic acid used

Claims (2)

PatentansprücheClaims 1 Verfahren zum Herstellen von Natrmmcyclohexylamidosulfonat durch Umsetzung von Cyclohexylamm mit Amidosulfonsaure, Kondensieren des Cyclohexylammonmmamidosulfonats mit Cyclohexylamm zu Cyclohexylammonium-N-cyclohexylamidosulfonat, Hydrolyse des letzteren mit wäßriger Natronlauge und Abscheidung des Natnumcyclohexylamidosulfonats aus der erhaltenen wäßrigen Losung, dadurch gekennzeichnet, daß man die Umsetzung von Cyclohexylamm mit Amidosulfonsaure m wäßriger Losung durchfuhrt1 Process for the preparation of sodium cyclohexyl amido sulfonate by reacting cyclohexylamm with sulfamic acid, condensing of Cyclohexylammonmmamidosulfonats with Cyclohexylammonium to Cyclohexylammonium-N-cyclohexylamidosulfonat, Hydrolysis of the latter with aqueous sodium hydroxide solution and separation of the Natnumcyclohexylamidosulfonats from the aqueous solution obtained, characterized in that that the reaction of cyclohexylammon with sulfamic acid m aqueous Solution 2 Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das azeotrope Gemisch aus Cyclohexylamm und Wasser einsetzt, das beim Eindampfen der bei der Hydrolyse von Cyclohexylammomum-N-cyclohexylamidosulfonat mit Natronlauge erhaltenen Losung anfallt.2 The method according to claim 1, characterized in that the azeotropic mixture from Cyclohexylammum and water are used, which during the evaporation of the hydrolysis of Cyclohexylammomum-N-cyclohexylamidosulfonat with sodium hydroxide solution obtained. 709 640/574 8 67 © Bundesdruckerei Berlin709 640/574 8 67 © Bundesdruckerei Berlin
DE1966F0050356 1966-10-04 1966-10-04 Process for the preparation of sodium cyclohexylamidosulfonate Pending DE1249262B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE1966F0050356 DE1249262B (en) 1966-10-04 1966-10-04 Process for the preparation of sodium cyclohexylamidosulfonate
DEP1268A DE1268141B (en) 1966-10-04 1967-04-05 Process for the preparation of sodium cyclopentylamido sulfonate
NL6713209A NL6713209A (en) 1966-10-04 1967-09-28
AT891267A AT276349B (en) 1966-10-04 1967-10-02 Process for the preparation of sodium cycloalkylamido sulfonates
GR670137066A GR37066B (en) 1966-10-04 1967-10-02 METHOD FOR THE PREPARATION OF SODIOCYCLOALKYMID SULPHONE COMPOUNDS.
FR123109A FR1539415A (en) 1966-10-04 1967-10-03 Process for preparing sodium cycloalkyl amidosulfonates
BE704651D BE704651A (en) 1966-10-04 1967-10-04

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1966F0050356 DE1249262B (en) 1966-10-04 1966-10-04 Process for the preparation of sodium cyclohexylamidosulfonate
DEF0052029 1967-04-05

Publications (1)

Publication Number Publication Date
DE1249262B true DE1249262B (en) 1967-09-07

Family

ID=25977444

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1966F0050356 Pending DE1249262B (en) 1966-10-04 1966-10-04 Process for the preparation of sodium cyclohexylamidosulfonate

Country Status (5)

Country Link
AT (1) AT276349B (en)
BE (1) BE704651A (en)
DE (1) DE1249262B (en)
GR (1) GR37066B (en)
NL (1) NL6713209A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2861569B1 (en) 2012-06-08 2017-02-08 Celanese Sales Germany GmbH Process for producing acesulfame potassium
US10023546B2 (en) 2016-09-21 2018-07-17 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10029999B2 (en) 2016-09-21 2018-07-24 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10030000B2 (en) 2016-09-21 2018-07-24 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10029998B2 (en) 2016-09-21 2018-07-24 Celanese International Corporation Acesulfame potassium compositions and processes for producing same

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2861569B1 (en) 2012-06-08 2017-02-08 Celanese Sales Germany GmbH Process for producing acesulfame potassium
USRE48464E1 (en) 2012-06-08 2021-03-16 Celanese Sales Germany Gmbh Process for producing acesulfame potassium
US10590096B2 (en) 2016-09-21 2020-03-17 Celenese International Corporation Acesulfame potassium compositions and processes for producing same
US11724994B2 (en) 2016-09-21 2023-08-15 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10029998B2 (en) 2016-09-21 2018-07-24 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10208004B2 (en) 2016-09-21 2019-02-19 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10227316B2 (en) 2016-09-21 2019-03-12 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10233164B2 (en) 2016-09-21 2019-03-19 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10233163B2 (en) 2016-09-21 2019-03-19 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10590095B2 (en) 2016-09-21 2020-03-17 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10590097B2 (en) 2016-09-21 2020-03-17 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10590098B2 (en) 2016-09-21 2020-03-17 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US11731948B2 (en) 2016-09-21 2023-08-22 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10030000B2 (en) 2016-09-21 2018-07-24 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10781191B2 (en) 2016-09-21 2020-09-22 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10781190B2 (en) 2016-09-21 2020-09-22 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10759770B2 (en) 2016-09-21 2020-09-01 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10023546B2 (en) 2016-09-21 2018-07-17 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10954204B2 (en) 2016-09-21 2021-03-23 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10954203B2 (en) 2016-09-21 2021-03-23 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10961207B2 (en) 2016-09-21 2021-03-30 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10975047B2 (en) 2016-09-21 2021-04-13 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US11718594B2 (en) 2016-09-21 2023-08-08 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10759771B2 (en) 2016-09-21 2020-09-01 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US11724993B2 (en) 2016-09-21 2023-08-15 Celanese International Corporation Acesulfame potassium compositions and processes for producing same
US10029999B2 (en) 2016-09-21 2018-07-24 Celanese International Corporation Acesulfame potassium compositions and processes for producing same

Also Published As

Publication number Publication date
GR37066B (en) 1969-04-16
NL6713209A (en) 1968-04-05
AT276349B (en) 1969-11-25
BE704651A (en) 1968-04-04

Similar Documents

Publication Publication Date Title
DE1249262B (en) Process for the preparation of sodium cyclohexylamidosulfonate
DE1643275C3 (en) Process for the preparation of 1,3-diaminopropanol- (2)
DE1918253A1 (en) 3-hydroxyisoxazoles (soil fungicides) prodn
DE964590C (en) Process for the production of glycocyamine
EP0174624A1 (en) Process for the preparation of lactic-acid esters
DE69401162T2 (en) Process for the preparation of hydroxyphenylacetic acids
DE850297C (en) Process for the preparation of amidine salts
DE749643C (en) Process for the production of unsaturated carboxamides
DE2065698A1 (en) PROCESS FOR THE PREPARATION OF 2ISOPROPYL-6-METHYL-4 (3H) -PYRIMIDONE
DE819692C (en) Process for the preparation of 4-amino-2,6-dialkyl- or -diaralkylpyrimidines
DE1194852B (en) Process for the production of phosphonic acids or their salts with at least two phosphorus atoms in the molecule
DE1470441C (en) Process for producing pyridoxal phosphate
EP0084329B1 (en) Process for the production of 1,4-bis-(dicyanomethylene) cyclohexane
DE719830C (en) Process for the production of salts of higher molecular phosphatidic acids
DE486772C (en) Process for the preparation of the N-oxyaethyl derivatives of 4-amino-1-oxybenzene
DE171789C (en)
EP0244613A1 (en) Cyclopropyl amines containing a tetrafluoromethyl group
DE1643896C3 (en) Process for the production of alpha-hydroxy-gamma-methylmercaptobutyramide
DE2819798A1 (en) PROCESS FOR PRODUCING 3-PHENYL-PYRIDAZONE- (6)
DE1229080B (en) Process for the preparation of 2-methylmercapto-indandione (1, 3) derivatives
DE1263781B (en) Process for the preparation of 2-methoxy-3, 6-dichlorobenzoic acid
DE1240087B (en) Process for the preparation of omega-aminododecanoic acid
DE1145631B (en) Process for the preparation of substituted 3-methylcarbaminotetrahydrofurans
DE2403664A1 (en) Purification of naphthalene - by heating with sulphuric acid and formalde-hyde, and distilling
DE2651418A1 (en) Recovering reacted prods. from sodium dithionate prepn. - by distn., acidification, heating pptn. filtering and crystallisation