一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List Metformin
657-24-9

Metformin synthesis

5synthesis methods
-

Yield:657-24-9 100%

Reaction Conditions:

with sodium hydroxide in water at 20; for 0.5 h;

Steps:

VI Example VI Preparation of metformin-L-glutamic acid-R (+) lipoic acid salt

Example VI Preparation of metformin-L-glutamic acid-R (+) lipoic acid salt Metformin hydrochloride (N,N-dimethylimidodicarbonimidic diamide hydrochloride, 5.25 g, 0.032 mol) was stirred in 1N sodium hydroxide (32 mL, 0.032 mol) at room temperature for 30 min. Water was removed from the mixture under vacuo. The crude mixture was treated with ethanol (100 mL) and stirred for 10 min. The white residue was filtered off and ethanol was removed under vacuum to get a white residue. The ethanol treatment was repeated again to get a white solid (quantitative), which was dried in pump and used as metformin free base. Method 1: Metformin free base (1.29 g, 0.010 mol) was taken in methanol (15 mL) and while stirring L-Glutamic acid (0.74 g, 0.050 mol) was added as solid. Lipoic acid (1.03 g, 0.050 mol) was separately dissolved in methanol (15 mL) and added to this mixture through a in-line syringe filter (to remove polymeric material, if any). The mixture was continued to stir for 30 min. Leaving the mixture in the refrigerator did not cause any precipitation of the salt, hence the solvent was removed under vacuo and dried in high vacuum pump. Metformin.L-Glutamic acid.R-Lipoic acid salt (2.9 g) was obtained as light yellow foamy solid. This solid is high hygroscopic and turns into gummy residue on exposure to air.Preparation of metformin-L-glutamic acid-R (+) lipoic acid saltVI200This solid is high hygroscopic and turns into gummy residue on exposure to air. The residue was suspended in acetonitrile (30 mL) and stirred for 18 h. Filtered the pale yellow solid and dried in vacuum for 16 h to get 2.32 g of 3. 1H NMR (200 MHz, D2O) - 1.15-2.1 (10H, m), - 2.1-2.42 (5H, m), -2.88 (12H, s), - 2.95-3.12 (18, m) - 3.48-3.62 (2H, m); 13C NMR (200 MHz, D2O) -c 25.86, 27.25.28.68, 33.81, 34.14, 37.66, 38.34, 40.51, 54.95, 56.93, 158.63, 160.28, 174.80, 181.44, 183.81. Method 2: Lipoic acid (1.03 g, 0.050 mol) was dissolved in acetonitrile (30 mL) and to this Metformin free base (1.29 g, 0.010 mol) and L-Glutamic acid (0.74 g, 0.050 mol) were added as solid.Preparation of metformin-L-glutamic acid-R (+) lipoic acid saltVI200Method 2: Lipoic acid (1.03 g, 0.050 mol) was dissolved in acetonitrile (30 mL) and to this Metformin free base (1.29 g, 0.010 mol) and L-Glutamic acid (0.74 g, 0.050 mol) were added as solid. The resulting mixture was stirred for 2 h and filtered. The pale yellow solid was dried in vacuo for 16 h to get 2.56 g of 3. 1H NMR (200 MHz, D2O) - 1.15-2.1 (10H, m), - 2.1-2.42 (5H, m), - 2.88 (12H, s), - 2.95-3.12 (1H, m) - 3.48-3.62 (2H, m); 13C NMR (200 MHz, D2O) -c 25.86, 27.25, 28.68, 33.81, 34.14, 37.66, 38.34, 40.51, 54.95, 56.93, 158.63, 160.28, 174.80, 181.44, 183.81.

References:

US2014/221467,2014,A1 Location in patent:Page/Page column 4-5

Metformin Related Search:

龙山县| 昭平县| 襄汾县| 峨边| 丰县| 龙井市| 阿克苏市| 咸丰县| 田阳县| 龙泉市| 新密市| 梓潼县| 湖北省| 萨迦县| 玛曲县| 海城市| 乌兰浩特市| 陇西县| 石屏县| 门头沟区| 太保市| 鹤山市| 承德县| 田林县| 治县。| 昭觉县| 桦川县| 黄浦区| 盱眙县| 屏边| 大竹县| 洛扎县| 宁化县| 姚安县| 沂源县| 原平市| 临猗县| 肃宁县| 察隅县| 青冈县| 隆安县|