Tag: M.W:100-200

A balanced equation for a chemical reaction indicates what is reacting and what is produced, but it reveals nothing about how the reaction actually takes place. The reaction mechanism is the process, or pathway, by which a reaction occurs.80841-78-7. An updated downstream synthesis route of 80841-78-7 as follows., 80841-78-7

Example 2; 36.0 g (50.3 mmol) ethyl 4-(l -hydroxy- 1-methy lethyl)-2-propy 1-1- {4-[2-(trityltetrazol-5-y I)- phenyl]phenyl} -methyl imidazole-5-carboxylate (Va) and 3.0 g (75.4 mmol) of NaOH were suspended in 413 ml dimethylacetamide. The suspension was then stirred at room temperature for 20 h and after that 6.9 g (50.3 mmol) of K2CO3, were added. The mixture was cooled to 00C and solution of 15.4 g (70.4 mmol) 4-chloromethyl-5-methyl-2-oxo-l,3- dioxolene in 39 ml of dimethylacetamide were slowly added. The mixture was slowly heated to 500C and stirred at this temperature for 2 h. After esterification was completed, the mixture was cooled to 10 0C and poured into a mixture of 625 ml of ethyl acetate and 625 ml of 10 % NaCl, and stirred at 25 0C for 15 min. The phases were separated and organic phase was washed 2chi with 500 ml of 10 % NaCl, dried over Na2SO4 and filtered. The filtrate was concentrated up to 14 (approximately 270 g) at reduced pressure.To the resulting solution, 80 ml of ethanol and 8.3 ml (100 mmol) of cone. HCl were added EPO and stirred at 24-26C for 3h. To the cooled mixture 600 ml of water was added and pH of the suspension was estimated to 5 by addition of 5 M NaOH. The phases were stirred for 15 min and separated. Water phase was reextracted with 150 ml of ethyl acetate. Collected organic phases were dried over Na2SO4, filtered and concentrated under reduced pressure. 560 ml of ethyl acetate were added and the mixture was evaporated again. After that, 300 ml of ethyl acetate were added and the mixture was cooled to 20 0C and stirred for Ih, filtered off and washed with 20 ml of fresh ethyl acetate. The yield of the product (I) was 21 g (75 %).

The chemical industry reduces the impact on the environment during synthesis, 4-(Chloromethyl)-5-methyl-1,3-dioxol-2-one, , I believe this compound will play a more active role in future production and life.

Reference£º
Patent; KRKA; WO2007/17135; (2007); A2;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

80841-78-7, A balanced equation for a chemical reaction indicates what is reacting and what is produced, but it reveals nothing about how the reaction actually takes place. The reaction mechanism is the process, or pathway, by which a reaction occurs.80841-78-7. An updated downstream synthesis route of 80841-78-7 as follows.

To a solution of the compound of Formula IV (5.0 g) in toluene (40 mL), dimethylacetamide (10 mL) is added, followed by addition of sodium hydroxide (1.2 g) and N,N-diisopropylamine (3.7 g) at 25-35C. The mixture is stirred at 40- 45C for 4 hours. 5-Methyl-2-oxo-(1 ,3-dioxolene-4-yl)methyl chloride (1.5 g) and tetrabutylammonium bromide (0.5 g) are added at 40-450C. The mixture is stirred at 60-70C for 8 hours. The mass is cooled to 25-35C, water (50 mL) is added, and the pH is adjusted to about 6-7 by adding 10% aqueous HCI. The layers are separated. The aqueous layer is extracted with toluene (25 mL). The organic layers are combined and washed with water (25 mL). The solvent is distilled under reduced pressure. Methanol (25 mL) is added to the residue. The mixture is cooled to 0-50C and stirred at that temperature for 45 minutes. The formed solid is filtered, washed with methanol (10 mL) and dried for 45 minutes under vacuum (yield 3.0 g).

A chemical reaction often occurs in steps, although it may not always be obvious to an observer.

Reference£º
Patent; DR. REDDY’S LABORATORIES LTD.; DR. REDDY’S LABORATORIES, INC.; KOLLA, Naveen Kumar; MANNE, Nagaraju; NAREDLA, Anitha; SHINDE, Sachin Gulabrao; WO2011/14611; (2011); A2;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

We know that the rate of many reactions can be accelerated by catalysts. A catalyst speeds up the rate of a reaction by lowering the activation energy; in addition, the catalyst is regenerated in the process. 80841-78-7, molecula formula is C5H5ClO3, below Introduce a new synthetic route., 80841-78-7

Toluene (180 L) is placed into a reactor and water (3.17 L) is added, followed by addition of ethyl-4-(1 -hydroxy-1 -methylethyl)-2-propylimidazole-5- carboxylate (18.0 Kg). The mass is stirred for about 10 minutes, heated to about 45C, and potassium carbonate (25.85 Kg) is added. The temperature of the mass is raised to about 65C and maintained for about 45 minutes. N-(triphenylmethyl)- 5-[4′-(bromomethyl)biphenyl-2-yl]tetrazole (48.9 Kg) and tetrabutylammonium bromide (4.82 Kg) are added at the same temperature and the mixture is stirred at 60-700C for 10 hours. Reaction completion is verified using thin layerchromatography (TLC). After the reaction is complete, the mass is washed with water (3*120 L) at about 500C. The mass is cooled to about 25C and toluene (468 L) and potassium tertiary-butoxide (12.6 Kg) is added, then the mass is maintained at the same temperature for about 1 hour. Water (0.85 L) is added and the mass is maintained at the same temperature for about 2 hours. Reaction completion is verified using TLC, then 5-methyl-2-oxo-(1 ,3-dioxolene-4-yl)methyl chloride (20 Kg), tetrabutylammonium bromide (4.82 Kg), and sodium carbonate (3.96 Kg) are added at 40-450C. The mass is stirred at about 55C for about 11 hours. After the reaction is complete, the mass is cooled to about 20C, water (540 L) is added and the pH is adjusted to about 6-7 by adding 10% aqueous HCI. The layers are separated. The aqueous layer is extracted with toluene (240 L). The organic layers are combined and washed with water (270 L). The solvent is distilled under reduced pressure. Acetone (189 L) is added to the residue and the mixture is heated to about 45C to produce a solution, then the solution is cooled to about 300C and maintained for about 20 minutes, followed by cooling to about 2C and maintaining for about 3 hours. The formed solid is filtered, washed with acetone (54 L), and dried for about 4 hours. The material obtained is re- crystallized from acetonitrile to yield 34.0 Kg of the title compound.

The chemical industry reduces the impact on the environment during synthesis, 4-(Chloromethyl)-5-methyl-1,3-dioxol-2-one, , I believe this compound will play a more active role in future production and life.

Reference£º
Patent; DR. REDDY’S LABORATORIES LTD.; DR. REDDY’S LABORATORIES, INC.; KOLLA, Naveen Kumar; MANNE, Nagaraju; NAREDLA, Anitha; SHINDE, Sachin Gulabrao; WO2011/14611; (2011); A2;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

Rate laws may be derived directly from the chemical equations for elementary reactions. This is not the case, however, for ordinary chemical reactions.80841-78-7, molecula formula is 4-(Chloromethyl)-5-methyl-1,3-dioxol-2-one, below Introduce a new synthetic route., 80841-78-7

188.0kg of tetrahydrofuran was added to a glass-lined reactor, 54.0kg 4- (1- hydroxy-1-methylethyl) -2-propyl-1- {4- [2- (trityl-tetrazol -5 – yl) phenyl] phenyl} methylimidazole-5-carboxylate, 92.0.0kg 4.0kg purified water and lithium hydroxide monohydrate.After complete addition, 20 stirred for 18 hours, once every 2 hours the reaction temperature recording, tracking and detection TLC starting material to substantially complete the reaction.After completion of the reaction, 240.0kg Ethyl acetate and sodium chloride solution (20.0 kg of sodium chloride was added to 180.0kg purified water, and dissolved with stirring), stirred for 10 minutes, allowed to stand for 20 minutes stratification.The organic phase was washed with sodium chloride solution (32.0 kg of sodium chloride was added to 288.0kg purified water, stirred and dissolved) Average washed twice, each wash was stirred for 10 minutes and allowed to stand for 20 minutes.The organic phase was collected, dried over anhydrous sodium sulfate and stirred for 4 hours.Filtered, and the filtrate was concentrated under reduced pressure to remove ethyl acetate (water bath temperature controlled at 45 ¡À 5 , the degree of vacuum at -0.1 ~ -0.06MPa), a solution 188.0kg N, N- dimethylformamide, is added 15.3kg anhydrous potassium carbonate, 2.7kg of potassium iodide was stirred at 20 ¡À 10 was slowly added 14.5kg 4- chloro-5-methyl-1,3-dioxol-2-one, addition was completed, heating, feed temperature control reaction was stirred for 2 hours at 40 ¡À 2 .After completion of the reaction, the material was cooled to 15 ¡À 5 rejection filter, and the filtrate was added to a solution of sodium chloride (338.0kg sodium chloride to 940.0kg purified water, and dissolved with stirring), the following -5 ~ 0 stirred for 4h, rejection was filtered, the filter cake was charged to an oven baking pan blast drying oven at a temperature of 40 ¡À 5 8 hours.To give 58.2kg of trityl olmesartan medoxomil, a yield of 96.5%.

A chemical reaction often occurs in steps, although it may not always be obvious to an observer.

Reference£º
Patent; Lianyungang Runzhong Pharmaceutical Co., Ltd.; Zhong Zhaobo; Cheng Jinrong; He Shaojie; Tang Zhaocheng; (6 pag.)CN110396084; (2019); A;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

An elementary termolecular reaction involves the simultaneous collision of three atoms, molecules, or ions.4,5-Dimethyl-1,3-dioxol-2-one, cas is 37830-90-3. Here is a downstream synthesis route of the compound 37830-90-3, 37830-90-3

(1) 4-Bromomethyl-5-methyl-1,3-dioxolen-2-one [compound of formula (III) in which R is methyl and X is bromine] 3.42 g of 4,5-dimethyl-1,3-dioxolen-2-one [compound of formula (III’) in which R is methyl, prepared in accordance with the procedure described in Tetrahedron Letters, pages 1701-1704, (1972)] was dissolved in 150 ml of carbon tetrachloride. To the solution were added 5.34 g of N-bromosuccinimide and a catalytic amount of alpha,alpha’-azobisisobutyronitrile. The mixture was heated under reflux for 15 minutes. The reaction mixture was cooled with ice, and the insoluble materials were removed by filtration. The filtrate was concentrated under reduced pressure to give a syrupy residue. The residue was distilled under reduced pressure, and a fraction having a boiling point of 115¡ã to 120¡ã C./5 mmHg was recovered. Thus, 4.2 g (yield 73percent) of the captioned compound having the following properties was obtained as a colorless liquid. Elemental analysis for C5 H5 BrO3: IR (neat) nu(cm-1): near 18 25 (carbonyl). NMR (CCl4) delta(ppm): 2.10 (3H, –CH3, s), 4.10 (2H, –CH2 Br, s).

Elementary reactions that involve the simultaneous collision of more than three molecules are highly improbable and have never been observed experimentally.

Reference£º
Patent; Kanebo Ltd.; US4448769; (1984); A;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

80841-78-7, A balanced equation for a chemical reaction indicates what is reacting and what is produced, but it reveals nothing about how the reaction actually takes place. The reaction mechanism is the process, or pathway, by which a reaction occurs.80841-78-7. An updated downstream synthesis route of 80841-78-7 as follows.

To the flask was added 2000 g of acetone, 160 g of ethyl 4- (1-hydroxy-1-methylethyl) -2-propylimidazole-5-carboxylate (II), 150 g of K2CO3, 460 g of 4- [2- (Trityltetrazol-5-yl) phenyl] benzyl bromide (III), 20g KI, the temperature was raised to reflux, the reaction was incubated for 34-38 hours under stirring.Then add 102g KOH, reflux reaction 6 ~ 8h. Cool to 10 ~ 20 , add 170g DMDO-Cl, incubated for 30 ~ 60min.Heating to reflux, the reaction 22 to 26 hours.After the reaction was added 40g of diatomaceous earth, stirring for 30 to 60 minutes, suction filtration, 200g acetone rinse cake. To the filtrate was added 800g of drinking water and 200g of refined hydrochloric acid, the reaction at room temperature for 2 to 4 hours, filtered to remove by-product triphenylcarbinol. Dropping 10% K2CO3 aqueous solution, adjusting feedstock pH to 4, cooling to 10 ~ 20 , stirring crystallization 2h, filtration, the filter cake with a mixture of pre-cooled 45g acetone and 230g of drinking water washing and drying, to obtain Olmesartan Medoxomil 309 g, total yield 83.1% (relative to ethyl-4- (1-hydroxy-1-methylethyl) -2-propylimidazole-5- carboxylate (II)), purity: 99.27% of the main peak, 0.08% of the olmesartan acid, 0.14% of the triphenylmethanol, and 0.13% of the largest unidentified one.

There are, however, a few established termolecular elementary reactions. The reaction of nitric oxide with oxygen appears to involve termolecular steps.

Reference£º
Patent; Zhejiang Huahai Zhicheng Pharmaceutical Co., Ltd.; Zhejiang Huahai Pharmaceutical Co., Ltd.; Jin Congyang; Wang Jiquan; Zhang Wenling; Wang Peng; (10 pag.)CN107311990; (2017); A;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

37830-90-3, A balanced equation for a chemical reaction indicates what is reacting and what is produced, but it reveals nothing about how the reaction actually takes place. The reaction mechanism is the process, or pathway, by which a reaction occurs.37830-90-3. An updated downstream synthesis route of 37830-90-3 as follows.

[01658] A solution of 4,5-dimethyl-2-oxo-1,3-dioxolene (1 mmole) and selenium dioxide (2.5 mmole) in dioxane was heated at reflux for 1 h. Evaporation, extraction and chromatography gave 5-methyl-4-hydroxymethyl-2-oxo-1,3-dioxolene as a yellow oil. TLC: RPf=0.5, 5percent MeOH-dichloromethane. [01659] A solution of 5-methyl-4-hydroxymethyl-2-oxo-1,3-dioxolene (1 mmole) in DMF was treated with tert-butyldimethylsilane (1.2 mmole) and imidazole (2.2 mmole) at 25 C. for 24 h. Extraction and chromatography gave 5-methyl-4-tert-butyldimethylsilyloxymethyl-2-oxo-1,3-dioxolene. [01660] A solution of 5-methyl-4-tert-butyldimethylsilyloxymethyl-2-oxo-1,3-dioxolene (1 mmole) and Lawesson’s reagent (1.2 mmole) in toluene was heated to 120 C. for 12 h. Extraction and chromatography gave 5-methyl-4-tert-butyldimethylsilyloxymethyl-2-thio-1,3-dioxolene. [01661] A solution of 5-methyl-4-tert-butyldimethylsilyloxymethyl-2-thio-1,3-dioxolene in methanolic hydrogen chloride was stirred at 0 C. for 1 h and 25 C. for 12 h. Extraction and chromatography gave 5-methyl-4-hydroxymethyl-2-thio-1,3-dioxolene.

There are, however, a few established termolecular elementary reactions. The reaction of nitric oxide with oxygen appears to involve termolecular steps.

Reference£º
Patent; Metabasis Therapeutics, Inc.; US6756360; (2004); B1;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

One of the major reasons is to use measurements of the macroscopic properties of a system, the rate of change in the concentration of reactants or products with time, to discover the sequence of events that occur at the molecular level. 37830-90-3, introduce a new downstream synthesis route. 37830-90-3

(1) Synthesis of 4-bromomethyl-5-methyl-1,3-dioxolen-2-one[the compound of formula (III) in which X is a bromine atom]: 3.42 g of 4,5-dimethyl-1,3-dioxolen-2-one (synthesised in accordance with Tetrahedron Letters, (1972), pages 1701-1704) was dissolved in 150 ml of carbon tetrachloride, and 5.34 g of N-bromosuccinimide and a catalytic amount of alpha,alpha’-azobisisobutyronitrile were added. The mixture was heated under reflux for 15 minutes. The reaction mixture was concentrated to half of its volume and the resulting insoluble matter was removed by filtration. Concentrating the filtrate gave a syrupy residue. The residue was distilled under reduced pressure to give a fraction boiling at 115¡ã to 120¡ã C./5 mm Hg which was 4.2 g (yield 73percent) of the captioned compound., 37830-90-3

This molecular description is the mechanism of the reaction; it describes how individual atoms, ions, or molecules interact to form particular products. The stepwise changes are collectively called the reaction mechanism.

Reference£º
Patent; Kanebo Ltd.; US4455310; (1984); A;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

80841-78-7, A balanced equation for a chemical reaction indicates what is reacting and what is produced, but it reveals nothing about how the reaction actually takes place. The reaction mechanism is the process, or pathway, by which a reaction occurs.80841-78-7. An updated downstream synthesis route of 80841-78-7 as follows.

130 ml of N,N-dimethylacetamide, 14.0 g (20 mmol) of ethyl 4-(2-hydroxypropan-2-yl)-2-propyl-1-((2′-(1-trityl-1H-tetrazol-5-yl)biphenyl-4-yl)methyl)-1H-imidazole-5-carboxylate and 2.2 g (16 mmol) of KOH were charged into reaction vessel at room temperature under inert atmosphere. The mixture was stirred at room temperature for 2 h, and then the sample of reaction mixture was analysed (HPLC; starting material 0.2 %, hydrolysed starting material 98.11 %). Then 3.0 g (2.2 mmol) of potassium carbonate powder and 1.4 g (8.4 mmol) of potassium iodide were added. The reaction mixture was cooled to 0 C and 5.0 g (33 mmol) of 4-(chloromethyl)-5-methyl-1,3-dioxol-2-one was added at 0 to 5C. After the addition, the reaction mixture was warmed to 40-45 C within one hour, then the mixture was stirred at this temperature for 2h. The sample of reaction mixture was analysed (HPLC; tritylolmesartan medoxomil 97.22 %, 4-(2-hydroxypropan-2-yl)-2-propyl-1-((2′-(1-trityl-1H-tetrazol-5-yl)biphenyl-4-yl)methyl)-1H-imidazole-5-carboxylate 0.09 %). The mixture was cooled to 10 to 20 C and then 250 ml of ethyl acetate was added. The mixture was cooled again to 5-10 C and then 200 ml of 10 % NaCl was added slowly. The temperature should not be higher than 25 C during the addition. The phases were mixed separated and organic phase was washed with 100 ml of 10 % NaCl (2*) and dried over anhydrous sodium sulphate. After the filtration filtrate was evaporated under reduced pressure at temperature under 45C to oily residue. To the residue 30 ml of acetonitrile was added at temperature not more than 45C. The mixture was stirred at this temperature for 10 minutes then was cooled to 20 to 25C and stirred at this temperature for 0.5 h and after that 3h at 0 to 5C. The suspension was filtered, the cake washed with cold acetonitrile and dried at 40 to 50C. Yield: 17.0 g (94%) HPLC: 99.72 % of the product, all impurities are under 0.1%. IR: 3408, 1818, 1805, 1741, 1681, 1529, 1147, 1003, 699 XRD:

A chemical reaction often occurs in steps, although it may not always be obvious to an observer.

Reference£º
Patent; Krka Tovarna Zdravil, D.D., Novo Mesto; EP2334668; (2011); A1;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem

Rate laws may be derived directly from the chemical equations for elementary reactions. This is not the case, however, for ordinary chemical reactions.37830-90-3, molecula formula is 4,5-Dimethyl-1,3-dioxol-2-one, below Introduce a new synthetic route., 37830-90-3

(1) 4-Bromomethyl-5-methyl-1,3-dioxolen-2-one [compound of formula (III) in which R is methyl and X is bromine] 3.42 g of 4,5-dimethyl-1,3-dioxolen-2-one [compound of formula (III’) in which R is methyl, prepared in accordance with the procedure described in Tetrahedron Letters, pages 1701-1704, (1972)] was dissolved in 150 ml of carbon tetrachloride. To the solution were added 5.34 g of N-bromosuccinimide and a catalytic amount of alpha,alpha’-azobisisobutyronitrile. The mixture was heated under reflux for 15 minutes. The reaction mixture was cooled with ice, and the insoluble materials were removed by filtration. The filtrate was concentrated under reduced pressure to give a syrupy residue. The residue was distilled under reduced pressure, and a fraction having a boiling point of 115¡ã to 120¡ã C./5 mmHg was recovered. Thus, 4.2 g (yield 73percent) of the captioned compound having the following properties was obtained as a colorless liquid. Elemental analysis for C5 H5 BrO3: IR (neat) nu(cm-1): near 18 25 (carbonyl). NMR (CCl4) delta(ppm): 2.10 (3H, –CH3, s), 4.10 (2H, –CH2 Br, s).

A chemical reaction often occurs in steps, although it may not always be obvious to an observer.

Reference£º
Patent; Kanebo Ltd.; US4448769; (1984); A;,
1,3-Benzodioxole – Wikipedia
Dioxole | C3H4O2 – PubChem