Tag: M.W=200-300

Adding a certain compound to certain chemical reactions, such as: 626-40-4, name is 3,5-Dibromoaniline, belongs to bromides-buliding-blocks compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 626-40-4, Computed Properties of C6H5Br2N

This example is a method for preparing 3,5-dibromo-3-methyl-4-aminoazobenzene, comprising the following steps:(1) Preparation of diazonium salt: Into a 100 mL beaker, add 5.0132 g of 3,5-dibromoaniline and 8 mL of 20% hydrochloric acid, 0Slowly add 1.5241 g of aqueous sodium nitrite solution to the suspension at 0-5 C. The suspension is cleared and urea is added to eliminate theAmount of nitrous acid, sodium acetate solids was adjusted to pH 5, and the resulting clear solution was placed in ice water for later use.(2) Preparation of sodium o-methylanilinyl methanesulfonate: Into a 50 mL round bottom flask was added 10 mL of water and 2.3534 g of AsiaAfter dissolving sodium bisulfite and sodium bisulfite, 0.7219 g of paraformaldehyde was added. After reacting at 60C for 35 minutes, 2.1413 g of the product was added dropwise.Methylaniline, the reaction was stopped after 2 h and a mixture of sodium o-anilino methanesulfonate was obtained.(3) Preparation of azobenzene compound: After the mixture obtained in step (2) is cooled to room temperature, the mixture is stirred under vigorous stirring.Slowly dropping into the diazonium salt obtained in step (1). At this time, the clarified diazonium salt solution gradually becomes dark red viscous liquid, and the temperature is controlled at 0-5 C.The reaction was completed after 6 h. Add 50 mL of 30% aqueous sodium hydroxide, the dark red viscous liquid becomes yellow turbid liquid, nitrogen gasUnder the protection of 50 C hydrolysis 7 h, after the end of the reaction with hydrochloric acid to adjust the pH value of about 8, the crude product was separated by thin layer chromatography to obtain the dye 3,5-Dibromo-3-methyl-4-aminoazobenzene 2.1402 g (yield 30%)

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 3,5-Dibromoaniline, and friends who are interested can also refer to it.

Reference:
Patent; Lingnan Normal University; Song Xiumei; Feng Zongcai; (9 pag.)CN105152963; (2017); B;,
Bromide – Wikipedia,
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In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 3972-64-3, name is 1-Bromo-3-(tert-butyl)benzene belongs to bromides-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below. Safety of 1-Bromo-3-(tert-butyl)benzene

I. 2-Bromo-4-tert-butylbenzenesulfonic acid (1)To a cooled (0¡ã C.) solution of commercially available 1-bromo-3-tert-butylbenzene (42.6 g; 199 mmol) in anhydrous dichloromethane (800 mL) was added chlorosulfonic acid (15.9 mL; 239.0 mmol) dropwise. After addition was complete, the reaction was stirred at 0¡ã C. for an additional 30 minutes, allowed to gradually warm to room temperature and further stirred overnight. The reaction mixture was concentrated under reduced pressure to about 500 mL and washed with aqueous hydrochloric acid (20 mL; 20N). The organic layer was separated and dried over magnesium sulfate which resulted in formation of a white precipitate. Methanol (200 mL) was added to dissolve the precipitate. The organic solution was filtered and concentrated under reduced pressure to yield the title product as a white solid (53.0 g).

The synthetic route of 3972-64-3 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Anderson, Eric C.; Biediger, Ronald J.; Chen, Jie; Dupre, Brian; Lory, Pedro; Market, Robert V.; Monk, Keith A.; Savage, Michael M.; Tennyson, Reginald; Young, Brandon M.; US2010/29753; (2010); A1;,
Bromide – Wikipedia,
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Adding a certain compound to certain chemical reactions, such as: 937046-98-5, name is 7-Bromopyrrolo[2,1-f][1,2,4]triazin-4-amine, belongs to bromides-buliding-blocks compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 937046-98-5, Recommanded Product: 7-Bromopyrrolo[2,1-f][1,2,4]triazin-4-amine

Intermediate M4 7-Bromo-5-chloropyrrolo[ 1 ,2-f] [ 1 ,2,4]triazin-4-amine To a solution of 7-bromopyrrolo[2, l-fJ[l,2,4]triazin-4-amine (0.48 g, 2.253 mmol) in DMF (11.27 ml) was added NCS (0.361 g, 2.70 mmol) and the reaction mixture was stirred at room temperature for 2 days and was monitored by LCMS. The reaction mixture was partitioned between 1.5M K2HPO4 and EtOAc. The organic phase was washed with 10% LiCl, brine, dried by Na2S04, filtered, and concentrated to afford a white solid as the crude product. The crude product was then purified by ISCO column (24g, 30-50-75% of EtOAc in hexane). The desired product was obtained as a white solid (0.48g) in 86% yield. Mass spectrum m/z 246.8, 248.8, 250.8 (M+H)+. XH NMR (400MHz, DMSO-d6) delta 8.17 (d, J=8.4 Hz, 1H), 7.93 (s, 1H), 7.21 – 7.00 (m, 1H), 6.98 (s, 1H).

In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, 7-Bromopyrrolo[2,1-f][1,2,4]triazin-4-amine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; BRISTOL-MYERS SQUIBB COMPANY; BHIDE, Rajeev S.; RUAN, Zheming; CHERNEY, Robert J.; CORNELIUS, Lyndon A.M.; DHAR, T.G. Murali; GONG, Hua; MARCOUX, David; POSS, Michael A.; QIN, Lan-ying; SHI, Qing; TINO, Joseph A.; (126 pag.)WO2016/64958; (2016); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Application of 418762-26-2, The chemical industry reduces the impact on the environment during synthesis 418762-26-2, name is 4-Bromo-2-fluoro-5-methylaniline, I believe this compound will play a more active role in future production and life.

Intermediate 11 2-fluoro-5-methyl-4-(l,4-dioxaspiror4.51dec-7-en-8-vl)anirine [0092] A mixture of 4,4,4,4-tetramethyl-2-(l,4-dioxaspiro[4.5]dec-7-en-8-yl)- 1,3,2-dioxaborolane (532.0 mg, 2.0 mmol), 4-bromo-2-fluoro-5-methylaniline (406.0 mg, 2.0 mmol), tetrakis(triphenylphosphine)palladium(0) (231.1 mg, 0.2 mmol), cesium fluoride (912.0 mg, 6.0 mmol), 1,2-dimethoxyethane (4 mL) and methanol (2 niL) was degassed for 5 min and then heated at 130C in a microwave reactor for 15 min. The reaction was concentrated in vacuo, and purified by silica chromatography (EtOAC / Hexanes: 3/7) to afford 2-fluoro-5-methyl-4-(l,4-dioxaspiro[4.5]dec-7-en- 8-yl)aniline; ESMS m/z 264.1 (M + H+).

In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, 4-Bromo-2-fluoro-5-methylaniline, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; IRM LLC; WO2009/158431; (2009); A2;,
Bromide – Wikipedia,
bromide – Wiktionary

Application of 13194-73-5, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 13194-73-5 name is 3,5-Dibromo-4-methylaniline, This compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.

Step A: 2,6-Dibromo-4-iodotoluene To a solution of 3,5-dibromo-4-methylaniline (4.17 g, 15.74 mmol) in CH2I2 (10 mL) was added tert-butylnitrite (3.0 mL, 23.61 mmol) slowly at 0 C. while stirring vigorously. The ice bath was removed and the reaction mixture was stirred at rt while the reaction was very exothermic, then placed it in a 80 C. oil bath and heated for 20 min. CH2I2 was distilled off under high vacuum, and the remaining residue was purified by flash chromatography eluding with 100% hexane to gave the title compound.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 3,5-Dibromo-4-methylaniline, and friends who are interested can also refer to it.

Reference:
Patent; Doherty, James B.; Stelmach, John E.; Chen, Meng-Hsin; Liu, Luping; Hunt, Julianne A.; Ruzck, Rowena D.; Goulet, Joung L.; Wisnoski, David D.; Natarajan, Swaminathan Ravi; Rupprecht, Kathleen M.; Bao, Jianming; Miao, Shouwu; Hong, Xingfang; Sinclair, Peter J.; Kallashi, Florida; US2003/92712; (2003); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 50670-49-0, name is 4-Bromo-4′-methyl-1,1′-biphenyl, This compound has unique chemical properties. The synthetic route is as follows., name: 4-Bromo-4′-methyl-1,1′-biphenyl

The reaction mixture containing compound 3 (300 mg, 0.456 mmol,tetrahydrate), 4-methylphenylboronic acid (248 mg, 1.82 mmol), K2CO3(251 mg, 1.82 mmol), and PdCl2(PPh3)2 (38 mg, 0.055 mmol) in EtOH/H2O (5/1; 6 mL) was stirred at 50 C for 4 h under a N2 atmosphere. After cooled toroom temperature, the solution was diluted with 50 mL of EtOH and passedthorough celite and concentrated. Hexane/EtOAc (1/1) was added andextracted with water twice. To the aqueous layer, 1 M HCl was addeddropwise until the pH was approximately 2, and the resulting suspensionwas extracted twice with EtOAc. The combined organic layer was dried withNa2SO4 and passed through a short pad of silica-gel and concentrated in vacuo.To a suspension of the residue, K2CO3 (251 mg, 1.82 mmol) and Pd(PPh3)4(32 mg, 0.027 mmol) in degassed DME/H2O (9/1; 6 mL) under a N2atmosphere, bromobenzene (0.142 mL, 1.37 mmol) was added. After stirringat reflux for 6 h, the reaction solution was cooled to room temperature, dilutedwith EtOAc, and passed through celite. The filtrate was washed with water andbrine, dried with Na2SO4, and concentrated in vacuo. The residue was purifiedby silica gel column chromatography (hexane?hexane/diethylether = 98/2) togive 88 mg of 4-methyl-1,10:40,100-terphenyl (40% from 3 after 2 steps) as awhite powder. Mp: 205-207 C (lit.20a 206-208 C). The 1H and 13C NMRspectra corresponded to literature data

Chemical properties determine the actual use. Each compound has specific chemical properties and uses. We look forward to more synthetic routes in the future to expand reaction routes of 50670-49-0.

Reference:
Article; Kuno, Shinichi; Kimura, Tomoyuki; Yamaguchi, Masanori; Tetrahedron Letters; vol. 55; 3; (2014); p. 720 – 724;,
Bromide – Wikipedia,
bromide – Wiktionary

Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 14922-91-9, name is 5-Bromo-2-ethylaniline, A new synthetic method of this compound is introduced below., category: bromides-buliding-blocks

Step 2: Preparation of 4-bromo-1-ethyl-2-iodobenzeneTo a stirred mixture of 5-bromo-2-ethylaniline (3.39 g, 200 mmol) in distilled water (110 ml) is added concentrated sulfuric acid (5.60 ml), followed by brief heating at reflux until dissolution. The mixture is allowed to cool to room temperature, producing a fine precipitate, then further cooled to approximately 0 0C in an ice/salt bath. To this slurry is added an aqueous solution of sodium nitrite (1.17 g, 16.94 mmol) in distilled water (10 ml) dropwise over 15 minutes, maintaining a temperature below 5 0C, followed by additional stirring for 30 minutes. The reaction mixture is next filtered then added to a second solution of aqueous potassium iodide (8.44 g, 50.83 mmol) in distilled water (45 ml) dropwise at room temperature. After the addition is complete the solution is briefly heated to 80 0C then allowed to cool to room temperature again. The reaction mixture is extracted with ethyl acetate (3 x 50 ml), and the organic phase is washed with 1 M aqueous hydrochloric acid (30 ml) and aqueous sodium thiosulfate (2 x 30 ml). After drying over anhydrous magnesium sulfate and concentration in vacuo 4-bromo-1-ethyl-2- iodobenzene (4.90 g) is furnished as an orange liquid.

The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.

Reference:
Patent; SYNGENTA LIMITED; MATHEWS, Christopher, John; SCUTT, James, Nicholas; WO2011/6543; (2011); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps, and cheap raw materials. 142808-15-9, name is 4-Bromo-2-fluorobenzotrifluoride, A new synthetic method of this compound is introduced below., Product Details of 142808-15-9

Into a 10000-mL 4-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed tetrahydrofuran (5000 mL), NH(i-Pr)2 (249 g, 1.20 equiv). This was followed by the addition of n-BuLi (905 mL, 1.10 equiv) dropwise with stirring in 30 min at -70C. The resulting solution was stirred for 0.5 hr at -30C. To this was added 4-bromo-2-fluoro- l-(trifluoromethyl)benzene (500 g, 2.06 mol, 1.00 equiv) dropwise with stirring at -78C in 2 hr. The resulting solution was stirred for 2 hr at -78C. The reaction was then poured into 1000 g of C02(s) at -70C. The pH value of the solution was adjusted to 3 with hydrogen chloride (2N) (1.5 mol/L). The resulting solution was extracted with 3×2000 mL of ethyl acetate and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. This resulted in 301 g (50%) of 6-bromo-2-fluoro-3-(trifluoromethyl)benzoic acid as a white solid.

The synthetic route of 142808-15-9 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; MERCK SHARP & DOHME CORP.; MANDAL, Mihir; TANG, Haifeng; XIAO, Li; SU, Jing; LI, Guoqing; YANG, Shu-Wei; PAN, Weidong; TANG, Haiqun; DEJESUS, Reynalda; HICKS, Jacqueline; LOMBARDO, Matthew; CHU, Hong; HAGMANN, William; PASTERNAK, Alex; GU, Xin; JIANG, Jinlong; DONG, Shuzhi; DING, Fa-Xiang; LONDON, Clare; BISWAS, Dipshikha; YOUNG, Katherine; HUNTER, David, N.; ZHAO, Zhiqiang; YANG, Dexi; WO2015/112441; (2015); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Application of 34950-82-8, In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 34950-82-8 as follows.

To a solution of I-69 (300 mg, 0.6 mmol) in DMF (10 mL) are added I-87 (140 mg, 0.7 mmol), tetrakis(triphenylphosphine)palladium (0) (70 mg, 0.06 mmol) and 2M Na2CO3 (1.5 mL, 3.0 mmol). The mixture is heated to 100 C. for 1 hour in a microwave reactor. The mixture is cooled down and is extracted with H2O (20 mL) and EtOAc (30 mL). The combined organic layer is dried with MgSO4 and is filtered. The filtrate is concentrated and the residue is purified by silica gel flash column chromatography with 10% MeOH in CH2Cl2 as the eluent to afford the title compound (200 mg). Example 176-180, Table 1-the reaction is run at 120 C.Example 176-180, Table 1-the reaction is run at 120 C. [0509] Example 184-185, Table 1-the reaction is run at 120 C Example 191, Table 1-the reaction is run at 120 C. Example 239-243, Table 1-the reaction is run for 6 hours at 100 C. in an oil bath

According to the analysis of related databases, 34950-82-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Boehringer Ingelheim International GmbH; BYLOCK, Lars Anders; US2013/195879; (2013); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Related Products of 15155-41-6, In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 15155-41-6 as follows.

Synthesis of 3,6-dibromobenzene-1,2-diamine: Dibromobenzo[c][1,2,5]thiadiazole (2.29 g, 10 mmol) and sodiumborohydride (5.7 g, 150 mmol) were added to ethanol at 0 Cand stirred at room temperature for 36 h. The solution wasadded water and ethyl acetate then was separated by separatoryfunnel. The organic layer was dried over MgSO4 then concentrated under reduced pressure and purified by chromatographyon a silica column eluting with petroleum ether/ethyl acetate(5:1, v/v) to afford a yellow solid (1.9 g, 71 % yield). 1H NMR(400 MHz, CDCl3, ppm) delta-aromatic H, 6.86 (d, 2H), 3.92 (s,4H); 13C NMR (100 MHz, CDCl3, ppm): 133.73,123.27, 109.70.

According to the analysis of related databases, 15155-41-6, the application of this compound in the production field has become more and more popular.

Reference:
Article; Sun, Xiaoxia; Lei, Xiaolong; Hu, Yu; Asian Journal of Chemistry; vol. 27; 7; (2015); p. 2427 – 2430;,
Bromide – Wikipedia,
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