GB1265255A - - Google Patents
Info
- Publication number
- GB1265255A GB1265255A GB1265255DA GB1265255A GB 1265255 A GB1265255 A GB 1265255A GB 1265255D A GB1265255D A GB 1265255DA GB 1265255 A GB1265255 A GB 1265255A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dihydro
- methyl isocyanate
- exotherm
- july
- dimethyl
- 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
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D307/78—Benzo [b] furans; Hydrogenated benzo [b] furans
- C07D307/86—Benzo [b] furans; Hydrogenated benzo [b] furans with an oxygen atom directly attached in position 7
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1,265,255. 2,3 - Dihydro - 2,2 - dimethyl - 7- benzofuranyl methyl carbamate. FMC CORP. 30 July, 1970 [30 July, 1969], No. 36858/70. Heading C2C. 2,3 - Dihydro - 2,2 - dimethyl - 7 - benzofuranyl methyl carbamate is prepared by reacting 2,3 - dihydro - 7 - hydroxy - 2,2 - dimethylbenzofuran and methyl isocyanate in proportions from roughly stoichiometric to a slight excess of methyl isocyanate, in an intensive mixing zone in the presence of an organic diluent which is liquid under ambient conditions and has a boiling point not above 80 C. and a heat of vaporization of at least 40 calories/gm.; initiating the reaction by means of a catalyst to produce an exotherm; controlling the exotherm by volatilizing the diluent and unreacted methyl isocyanate, condensing the volatile materials and returning them to the reaction zone until the reactions are substantially complete ; and thereafter continuing the volatilization of the inert liquid by the sensible heat in the reaction mixture to produce the required compound in dry powdered form. The preferred catalyst is triethylamine and suitable diluents are, for example, benzene, cyclohexane, methylcyclopentane, pentane, hexane, methylene dichloride, carbon tetrachloride, chloroform and ethyl isobutyl ether.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84606969A | 1969-07-30 | 1969-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1265255A true GB1265255A (en) | 1972-03-01 |
Family
ID=25296854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1265255D Expired GB1265255A (en) | 1969-07-30 | 1970-07-30 |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE754060A (en) |
| CH (1) | CH539034A (en) |
| DE (1) | DE2037694C3 (en) |
| FR (1) | FR2056908B1 (en) |
| GB (1) | GB1265255A (en) |
| IL (1) | IL34884A (en) |
| NL (1) | NL7011260A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102731453A (en) * | 2012-07-09 | 2012-10-17 | 湖南海利化工股份有限公司 | Production control method of 98 percent carbofuran |
-
1970
- 1970-07-09 IL IL34884A patent/IL34884A/en unknown
- 1970-07-27 FR FR707027603A patent/FR2056908B1/fr not_active Expired
- 1970-07-28 BE BE754060D patent/BE754060A/en unknown
- 1970-07-29 DE DE2037694A patent/DE2037694C3/en not_active Expired
- 1970-07-29 NL NL7011260A patent/NL7011260A/xx not_active Application Discontinuation
- 1970-07-30 GB GB1265255D patent/GB1265255A/en not_active Expired
- 1970-07-30 CH CH1153270A patent/CH539034A/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102731453A (en) * | 2012-07-09 | 2012-10-17 | 湖南海利化工股份有限公司 | Production control method of 98 percent carbofuran |
| CN102731453B (en) * | 2012-07-09 | 2015-12-02 | 湖南海利化工股份有限公司 | A kind of production control method of 98% content carbofuran |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7011260A (en) | 1971-02-02 |
| BE754060A (en) | 1971-01-28 |
| IL34884A0 (en) | 1971-02-25 |
| DE2037694B2 (en) | 1974-05-16 |
| DE2037694A1 (en) | 1971-05-06 |
| DE2037694C3 (en) | 1975-01-02 |
| CH539034A (en) | 1973-07-15 |
| IL34884A (en) | 1974-01-14 |
| FR2056908B1 (en) | 1973-01-12 |
| FR2056908A1 (en) | 1971-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |