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 2-HYDROXYTETRAHYDROPYRAN
694-54-2

2-HYDROXYTETRAHYDROPYRAN synthesis

11synthesis methods
-

Yield:694-54-2 95 g

Reaction Conditions:

with hydrogenchloride in chloroform at 70; for 2 h;Temperature;

Steps:

1.1; 2.1; 3.1; 4.1 1) Preparation of 2-hydroxytetrahydropyran
Add 105g of 5-hydroxyvaleraldehyde and 200mL of chloroform into the three-necked flask, while continuously introducing anhydrous hydrogen chloride gas, heating to 70°C and reacting for 2h; The product after the reaction was distilled under reduced pressure, and the fraction with the mother liquor temperature of 50°C to 70°C was collected under a pressure of 300Pa. Obtain 95 g of 2-hydroxytetrahydropyran as a colorless transparent viscous oily product.

References:

Dongguan Bodun Flavors Co., Ltd.;Cai Guoxiang;Zhong Nengbang;Guan Junjian;Wu Qilin;Hu Shilin;Feng Jiao CN111303101, 2020, A Location in patent:Paragraph 0079-0125

2-HYDROXYTETRAHYDROPYRAN Related Search:

满洲里市| 崇信县| 石狮市| 遂溪县| 昌宁县| 南阳市| 开阳县| 温宿县| 泽普县| 榆社县| 吉林市| 正阳县| 萍乡市| 晋江市| 新巴尔虎左旗| 姚安县| 扎鲁特旗| 固安县| 扎鲁特旗| 文成县| 平乡县| 右玉县| 塘沽区| 呼图壁县| 呼玛县| 前郭尔| 彭山县| 金湖县| 贵州省| 邵阳县| 沁源县| 闽侯县| 冕宁县| 彰化市| 长岛县| 福泉市| 刚察县| 荣昌县| 观塘区| 曲周县| 隆化县|