EP1377546A2 - Procede de production de thiosemicarbazides - Google Patents

Procede de production de thiosemicarbazides

Info

Publication number
EP1377546A2
EP1377546A2 EP02716977A EP02716977A EP1377546A2 EP 1377546 A2 EP1377546 A2 EP 1377546A2 EP 02716977 A EP02716977 A EP 02716977A EP 02716977 A EP02716977 A EP 02716977A EP 1377546 A2 EP1377546 A2 EP 1377546A2
Authority
EP
European Patent Office
Prior art keywords
thiosemicarbazide
producing
diisopropyl
mtsc
dithiocarbamate
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.)
Withdrawn
Application number
EP02716977A
Other languages
German (de)
English (en)
Inventor
Colette De Klerk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Corteva Agriscience LLC
Original Assignee
Dow AgroSciences LLC
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 Dow AgroSciences LLC filed Critical Dow AgroSciences LLC
Publication of EP1377546A2 publication Critical patent/EP1377546A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D285/00—Heterocyclic compounds containing rings having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by groups C07D275/00 - C07D283/00
    • C07D285/01—Five-membered rings
    • C07D285/02—Thiadiazoles; Hydrogenated thiadiazoles
    • C07D285/04—Thiadiazoles; Hydrogenated thiadiazoles not condensed with other rings
    • C07D285/12—1,3,4-Thiadiazoles; Hydrogenated 1,3,4-thiadiazoles
    • C07D285/125—1,3,4-Thiadiazoles; Hydrogenated 1,3,4-thiadiazoles with oxygen, sulfur or nitrogen atoms, directly attached to ring carbon atoms, the nitrogen atoms not forming part of a nitro radical
    • C07D285/135—Nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C337/00—Derivatives of thiocarbonic acids containing functional groups covered by groups C07C333/00 or C07C335/00 in which at least one nitrogen atom of these functional groups is further bound to another nitrogen atom not being part of a nitro or nitroso group
    • C07C337/06—Compounds containing any of the groups, e.g. thiosemicarbazides

Definitions

  • This invention relates to a process for producing thiosemicarbazides.
  • MTSC 4-Methyl-3-thiosemicarbazide
  • BTDA 5- t-butyl-2-methylamino-1 ,3,4-thiadiazole
  • Tebuthiuron has the chemical name 1-(5-tert-butyl- 1 ,3,4-thiadiazol-2-yl)-1 ,3 dimethylurea.
  • the current production process for MTSC entails the hydrazinolysis of ammonium N-methyl-dithiocarbamate.
  • Methyl isothiocyanate (MITC) is believed to be formed in situ from ammonium N-methyldithiocarbamate when heated in the presence of bases. It reacts with hydrazine monohydrate to give MTSC.
  • This process affords MTSC of 93-94% purity.
  • the purity of MTSC is a critical factor in the manufacturing of BTDA of high purity (98 + %) and yield.
  • the MTSC produced by this process is of insufficient quality to produce high quality BTDA.
  • This process also generates effluents containing high concentrations of ammonium salts.
  • the large volume of effluent produced during this process is a major problem (approximately four tons of effluent are produced for every ton of MTSC produced on plant scale).
  • a process for producing a thiosemicarbazide includes the steps of reacting an alkylamine with carbon disulphide in the presence of a base selected from N,N-diisopropylethylamine (DIPEA) and N,N,-diisopropylmethylamine (DIPMA) to produce an intermediate and converting the intermediate into the thiosemicarbazide. It is preferred that the reaction of the alkylamine with the carbon disulphide takes place in the presence of an excess of the base.
  • DIPEA N,N-diisopropylethylamine
  • DIPMA N,N,-diisopropylmethylamine
  • the intermediate is an N,N-diisopropyl-ethylammonium dithiocarbamate or a N,N-diisopropyl-methylammonium dithiocarbamate. Both intermediates are believed to be new and form another aspect of the invention.
  • the structure of N.N-diisopropylethyl ammonium N-alkyl dithiocarbamate is:
  • the invention further provides a method of producing an N,N-diisopropyl- ethylammonium dithiocarbamate or an N,N-diisopropyl-methylammonium dithiocarbamate by reacting an alkylamine with carbon disulphide in the presence of DIPEA or DIPMA.
  • the alkylamine which is used in the process of the invention has the formula alkyl-NH 2 , i.e. a primary alkylamine.
  • the preferred alkyl is methyl.
  • the thiosemicarbazide which is produced by the process of the invention may have the formula:
  • the invention has particular application to producing MTSC and an intermediate therefor, N,N-diisopropyl-ethylammonium dithiocarbamate, following steps 1 and 2 set out hereinafter:
  • step 1 The reaction of step 1 is highly exothermic and cooling is generally necessary to maintain the temperature of the reaction medium below 30°C.
  • DIPEA DIPEA
  • the intermediate (A) has been shown to have significant stability resulting in a decrease in the formation of by-products such as thiocarbohydrazide and dimethylthiourea.
  • MTSC in yields of 70 to 76% and purities of 97,5 to 98,5% are attainable.
  • Methylamine (77, 5g; 40% solution) and DIPEA (142, 2g) were charged to a 1 litre reactor equipped with a reflux condenser and a stirrer.
  • CS 2 (76g) was added dropwise with stirring during 30 minutes.
  • the reaction temperature was maintained below 30°C by external cooling during the addition of CS 2 .
  • the mixture was stirred for an additional 3 hours after which distillate (60g) from a previous batch was added.
  • the reaction mixture was diluted with water to obtain a DTC (dithiocarbamate) concentration of 24%.
  • Methylamine (38.7g; 40% solution) and DIPEA (82.4g) were charged to a 0,5 litre reactor equipped with a reflux condenser and a stirrer.
  • CS 2 (38.1g) was added dropwise with stirring during 30 minutes.
  • the reaction temperature was maintained below 30°C by external cooling during the addition of CS 2 .
  • the mixture was stirred for an additional 3 hours after which distillate (30g) from a previous batch was added.
  • the reaction mixture was diluted with water to obtain a DTC (dithiocarbamate) concentration of 24%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Nitrogen- Or Sulfur-Containing Heterocyclic Ring Compounds With Rings Of Six Or More Members (AREA)

Abstract

L'invention concerne un procédé de production d'un thiosemicarbazide, consistant à faire réagir une alkylamine avec du sulfure de carbone en présence d'une base, choisie entre la N,N-diisopropyléthylamine et la N,N,-diisopropylméthylamine, pour obtenir un produit intermédiaire, puis à convertir ce produit intermédiaire en thiosemicarbazide. Ce procédé peut être mis en oeuvre en particulier pour produire du 4-méthyl-3-thiosemicarbazide, un produit intermédiaire utile dans la production de l'herbicide à large spectre tebuthiuron.
EP02716977A 2001-04-09 2002-04-02 Procede de production de thiosemicarbazides Withdrawn EP1377546A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA200102904 2001-04-09
ZA200102904 2001-04-09
PCT/IB2002/001023 WO2002081438A2 (fr) 2001-04-09 2002-04-02 Procede de production de thiosemicarbazides

Publications (1)

Publication Number Publication Date
EP1377546A2 true EP1377546A2 (fr) 2004-01-07

Family

ID=25589131

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02716977A Withdrawn EP1377546A2 (fr) 2001-04-09 2002-04-02 Procede de production de thiosemicarbazides

Country Status (10)

Country Link
EP (1) EP1377546A2 (fr)
JP (1) JP2004536795A (fr)
KR (1) KR20030086351A (fr)
CN (1) CN1518539A (fr)
BR (1) BR0208743A (fr)
CA (1) CA2446918A1 (fr)
HU (1) HUP0303844A2 (fr)
IL (1) IL158288A0 (fr)
MX (1) MXPA03009215A (fr)
WO (1) WO2002081438A2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102584661A (zh) * 2012-01-19 2012-07-18 中国科学院海洋研究所 一种取代苯胺基硫脲化合物的制备方法
CN103709081B (zh) * 2013-12-13 2016-01-06 黄河三角洲京博化工研究院有限公司 一种氨基硫脲的制备方法
CN104860857B (zh) * 2015-04-09 2017-03-08 山东华阳农药化工集团有限公司 甲基氨基硫脲合成工艺
CN105854940B (zh) * 2016-04-06 2018-05-15 上海应用技术学院 (R)-1-(1-苯乙基)硫脲修饰的Cr-Anderson型杂多酸催化剂、制备方法及其应用
CN105833909B (zh) * 2016-04-06 2018-05-15 上海应用技术学院 (S)-1-(2-羟基-1-苯乙基)硫脲修饰的Cr-Anderson型杂多酸催化剂、制备方法及其应用
CN105772086B (zh) * 2016-04-06 2018-03-30 上海应用技术学院 (S)‑1‑(1‑羟乙基‑1‑异丙基)硫脲修饰的Mn‑Anderson型杂多酸催化剂、制备方法及其应用
CN105854952B (zh) * 2016-04-06 2018-05-15 上海应用技术学院 (S)-1-(2-羟基-1-苯乙基)硫脲修饰的Mn-Anderson型杂多酸催化剂、制备方法及其应用
CN105772101B (zh) * 2016-04-06 2018-03-30 上海应用技术学院 1‑苯乙基硫脲修饰的Mn‑Anderson型杂多酸催化剂、制备方法及其应用
CN105797770B (zh) * 2016-04-06 2018-03-30 上海应用技术学院 (S)‑1‑(3‑羟基‑1‑苯丙基)硫脲修饰的Cr‑Anderson型杂多酸催化剂、制备方法及其应用
CN105797769B (zh) * 2016-04-06 2018-03-30 上海应用技术学院 (R)‑1‑(2‑羟基‑1‑苯乙基)硫脲修饰的Mn‑Anderson型杂多酸催化剂、制备方法及其应用
CN105772100B (zh) * 2016-04-06 2018-05-15 上海应用技术学院 (R)-1-(1-(2-萘基)乙基)硫脲修饰的Cr-Anderson型杂多酸催化剂、制备方法及其应用
CN105772085B (zh) * 2016-04-06 2018-04-13 上海应用技术学院 (S)‑1‑(1‑羟乙基‑1‑异丙基)硫脲修饰的Cr‑Anderson型杂多酸催化剂、制备方法及其应用

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA931961A (en) * 1970-04-17 1973-08-14 Gulf Research And Development Company Combating unwanted vegetation with 1,3,4-thiadiazolylureas
EP0339964B1 (fr) * 1988-04-27 1994-12-14 DowElanco Synthèse de 4-methyl-3-thiosemicarbazide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02081438A2 *

Also Published As

Publication number Publication date
WO2002081438A2 (fr) 2002-10-17
WO2002081438A3 (fr) 2002-11-28
MXPA03009215A (es) 2004-03-10
CN1518539A (zh) 2004-08-04
HUP0303844A2 (hu) 2004-03-29
IL158288A0 (en) 2004-05-12
JP2004536795A (ja) 2004-12-09
CA2446918A1 (fr) 2002-10-17
BR0208743A (pt) 2004-06-22
KR20030086351A (ko) 2003-11-07

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