SU456521A1 - Method of preparing 5-amino-benzodioxane-1,4 - Google Patents
Method of preparing 5-amino-benzodioxane-1,4Info
- Publication number
- SU456521A1 SU456521A1 SU7201838850A SU1838850A SU456521A1 SU 456521 A1 SU456521 A1 SU 456521A1 SU 7201838850 A SU7201838850 A SU 7201838850A SU 1838850 A SU1838850 A SU 1838850A SU 456521 A1 SU456521 A1 SU 456521A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- amino
- benzodioxane
- preparing
- benzene
- ethanol
- Prior art date
Links
Landscapes
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
Description
в воде, мало растворимое в холодном спирте или эфире/ лучше в бензоле.in water, slightly soluble in cold alcohol or ether / better in benzene.
Б. 5-Амино6ензодиоксан-1,4-.B. 5-amino 6-benzodioxan-1,4-.
6 г 5-нитробензодиоксана-1,4 раствор ют в 70 мл нагретого до 80%-го этанола, прибавл ют.10 г железа в порошке и 0,5 г медной стружки (катализатор), перемешивают при еще 15 мин, в течение которых прибавл ют по капл м 1,5 мл концентрированной сол ной кислоты. Затем реакционную смесь кип т т и перемешивают Д ч, гор чий раствор фильтруют, филь. .трат охлаждают до 20 С,подкисл ют сол ной кислотой (индикатор конго) отгон ют этанол, остаток подщелачивают концентрированным раствором едкого натра, экстрагируют бензолом, перзгонкой бензольного экстракта вьщел ют 3,8 г (75%) продукта; т.кип. l28130°С (5 мм рт.ст); 1,6 g of 5-nitrobenzodioxane-1,4 are dissolved in 70 ml of heated to 80% ethanol, 10 g of iron in the powder and 0.5 g of copper chips (catalyst) are added, stirred for another 15 minutes, during which 1.5 ml of concentrated hydrochloric acid is added dropwise. Then the reaction mixture is boiled and stirred for D h, the hot solution is filtered, filter. The mixture is cooled to 20 ° C, acidified with hydrochloric acid (Congo indicator), ethanol is distilled off, the residue is made alkaline with concentrated sodium hydroxide solution, extracted with benzene, 3.8 g (75%) of the product is extracted with percolation of the benzene extract; bp l28130 ° C (5 mm Hg); one,
212,279 нм, 4,60; 2,92 (в этаноле ) .212.279 nm, 4.60; 2.92 (in ethanol).
Продукт представл ет собой густое 5 бесцветное масло, желтеющее на воздухе , нерастворимое в воде, растворимое в спирте, эфире и бензоле.The product is a thick, 5 colorless oil yellowing in air, insoluble in water, soluble in alcohol, ether and benzene.
формула изобретени invention formula
Способ получени 5-аминобензодиоксана-1 ,4, о тличающийс тем, что, с целью повышени продукта, 3-нитропирокатехин подвергают взаимодействию с 1,2-дибромэтаном в присутствии карбоната натри в органическом растворителе с последующим восстановлением образующегос при этом 5-нитрсбензодиоксана железом-в спиртовом растворе сол ной кислоты.The method of obtaining 5-aminobenzodioxan-1, 4, which is characterized by the fact that, in order to increase the product, 3-nitropyrocatechin is reacted with 1,2-dibromoethane in the presence of sodium carbonate in an organic solvent, followed by reduction of the 5-nitroxybenzodioxane formed by iron to in an alcoholic solution of hydrochloric acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7201838850A SU456521A1 (en) | 1972-10-20 | 1972-10-20 | Method of preparing 5-amino-benzodioxane-1,4 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7201838850A SU456521A1 (en) | 1972-10-20 | 1972-10-20 | Method of preparing 5-amino-benzodioxane-1,4 |
Publications (1)
Publication Number | Publication Date |
---|---|
SU456521A1 true SU456521A1 (en) | 1978-01-05 |
Family
ID=20529995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU7201838850A SU456521A1 (en) | 1972-10-20 | 1972-10-20 | Method of preparing 5-amino-benzodioxane-1,4 |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU456521A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100422169C (en) * | 2006-11-20 | 2008-10-01 | 烟台万润精细化工股份有限公司 | Preparation method of 1, 4-benzodioxan-5-amine |
-
1972
- 1972-10-20 SU SU7201838850A patent/SU456521A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100422169C (en) * | 2006-11-20 | 2008-10-01 | 烟台万润精细化工股份有限公司 | Preparation method of 1, 4-benzodioxan-5-amine |
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