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 1-Methylpyrazole
930-36-9

1-Methylpyrazole synthesis

10synthesis methods
1-Methylpyrazole was prepared by the condensation of 1,1,3,3-tetraethoxypropane with methylhydrazine[1].
-

Yield:930-36-9 14%

Reaction Conditions:

at 115 - 140; for 8 - 9 h;

Steps:

4; 6 EXAMPLE 4; Synthesis of N-Methylpyrazole
The apparatus used is the same as that described in Example 1. 20.64 g of pyrazole, i.e. 0.3 mol, and 4.5 g of dimethyl carbonate, i.e. 0.05 mol, were introduced into the reactor. The medium was then heated to 140° C. and this temperature was maintained throughout the reaction. The dimethyl carbonate was introduced into the reactor with a flow rate of 60 mmol/h for 8 hours and the methanol produced was distilled off as it was formed. The reaction medium was then allowed to cool to ambient temperature to obtain 17.24 g of N-methyyl pyrazole i.e. 0.21 mol, which corresponded to a yield of 70%.EXAMPLE 6 Synthesis of N-Methylpyrazole Without Withdrawal of the Methanol [0028] The apparatus used is the same as that described in Example 1. 20.64 g of pyrazole, i.e. 0.3 mol, and 4.5 g of dimethyl carbonate, i,e. 0.05 mol, were introduced into the reactor. The medium was then heated to 140° C. and then the dimethyl carbonate was introduced into the reactor with a flow rate of 60 mmol/h (i.e. 5.4 g/h) for 8 hours. The methanol formed was not withdrawn. [0029] It was found that the temperature of the reaction medium remained stable at 140° C. for 1 hour and then gradually decreased to 115° C. at the end of the reaction. The reactor medium was then allowed to cool to ambient temperature to obtain only 3.53 g of N-methylpyrazole, i.e. 0.042 mol, which corresponded to a yield of 14%.

References:

Borredon, Elisabeth;Chabaud, Berhard;Gaset, Antoine;Thiebaud-Roux, Sophie;Ouk, Samedy US2004/24205, 2004, A1 Location in patent:Page 2; 3

FullText

1-Methylpyrazole Related Search:

宝清县| 鹰潭市| 贵州省| 眉山市| 灵宝市| 桦甸市| 中江县| 博兴县| 德格县| 土默特右旗| 喀喇沁旗| 安陆市| 丰县| 久治县| 无为县| 岫岩| 杨浦区| 井陉县| 余江县| 大竹县| 铜川市| 台中市| 县级市| 易门县| 罗山县| 斗六市| 揭阳市| 扎兰屯市| SHOW| 图片| 平原县| 承德县| 永靖县| 漳平市| 精河县| 日照市| 大方县| 林西县| 邹城市| 佛坪县| 明星|