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 Isovanillin
621-59-0

Isovanillin synthesis

14synthesis methods
Synthesis of isovanillin: 4-Hydroxybenzaldehyde is used as raw material, firstly react with bromine to obtain 3-bromo-4-hydroxybenzaldehyde, then react with methyl iodide to obtain 3-bromo-4-methoxybenzaldehyde, and then hydrolyzed under the action of sodium hydroxide and cuprous chloride to produce isovanillin. The yield was 64.1%.
-

Yield:621-59-0 97.2%

Reaction Conditions:

with water at 65; for 3 h;Large scale;Reagent/catalyst;Time;

Steps:

1.2; 2.2

(2) Add 728kg of intermediates, 150kg of SO42-/ZrO2-TiO2 catalyst, and 1500kg of water to the reactor, and react at 65°C for 3 hours to complete the reaction. Press filter the reaction solution, dissolve the filter cake with 2000kg ethanol, keep stirring at 60°C for 4h; press filter, transfer the filtrate to the crystallization kettle, lower the temperature to 0°C, keep stirring for 4h; Press filtration to obtain 631.23 kg of wet product, the filtrate is transferred to a rectification device, and the obtained solid is vacuum dried to a constant weight to obtain 593.21 kg of isovanillin.

References:

CN113185391,2021,A Location in patent:Paragraph 0019; 0031-0039; 0041-0051

Isovanillin Related Search:

彝良县| 昌吉市| 兰西县| 珲春市| 扶风县| 开鲁县| 茌平县| 张家口市| 荣昌县| 灵台县| 酒泉市| 瓮安县| 保亭| 山西省| 洛南县| 南康市| 漠河县| 巴林左旗| 将乐县| 海安县| 安宁市| 文成县| 邢台县| 广水市| 深州市| 黄石市| 敖汉旗| 新郑市| 南开区| 阜阳市| 鱼台县| 莎车县| 曲周县| 昆山市| 玉林市| 青神县| 印江| 天台县| 尼勒克县| 福鼎市| 余江县|