天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

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 3,4-DIMETHYLTHIENO[2,3-B]THIOPHENE
175202-58-1

3,4-DIMETHYLTHIENO[2,3-B]THIOPHENE synthesis

5synthesis methods
-

Yield:175202-58-1 99.2%

Reaction Conditions:

with 5% rhodium-on-charcoal;potassium tert-butylate at 150; under 6080.41 Torr; for 25 h;Inert atmosphere;Temperature;Pressure;Reagent/catalyst;Concentration;

Steps:

2.1; 2.2 Example 2One-step synthesis of 3,4-dimethylthieno [2,3-b] thiophene, comprising the steps of:

1) Thieno [2,3-b] thiophene, nitromethane, potassium tert-butoxide and5% rhodium carbon mixture, purged with argon, warmed to 150 ,Pressurized to 8 atmospheres, the reaction 25h; wherein thieno [2,3-b] and thiophene,The molar amounts of nitromethane and potassium tert-butoxide were 0.1 mol,4.5 mol and 0.7 mol, the amount of rhodium carbon is 3.2% of the weight of thieno [2,3-b] thiophene;2) After the reaction, the solid rhodium carbon was recovered by filtration, the filtrate was washed with water,Concentration by distillation gave an excess of the substituted methane and 16.68 g of solid 3,4-dimethylthieno [2,3-b] thiophene in 99.2% yield. Recycling of solid rhodium carbon with chloroform after drying can be reused.

References:

CN106986882,2017,A Location in patent:Paragraph 0023; 0024; 0025; 0026; 0027; 0028-0036

3,4-DIMETHYLTHIENO[2,3-B]THIOPHENE Related Search: