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 Phosphorous acid
13598-36-2

Phosphorous acid synthesis

3synthesis methods
Phosphorus acid can be prepared by the reaction of phosphorus trichloride with water:
PCl3 + 3H2O → H3PO4 + 3HCl
The reaction is violent. Addition of PCl3 should be extremely cautious and slow. The addition can be carried out safely in the presence of concentrated HCl. Alternatively, a stream of air containing PCl3 vapor is passed into icecold water and solid crystals of H3PO4 form.
Alternatively, phosphorus acid can be prepared by adding phosphorus trichloride to anhydrous oxalic acid:
PCl3 + 3(COOH）2 → H3PO3 + 3CO + 3CO2 + 3HCl
In this reaction, all products except H3PO3 escape as gases leaving the liquid acid.
Dissolution of phosphorus sesquioxide in water also forms phosphorus acid. When shaken with ice water, phosphorus acid is the only product .
P4O6 + 6H2O → 4H3PO3
However, in hot water part of the phosphorus acid disproportionates to phosphoric acid and phosphorus or phosphine.
-

Yield:13598-36-2 84%

Reaction Conditions:

with Ni-doped silica for 18 h;Reflux;

Steps:



0056] Phosphorous acid: (Table 2, entry 12). After concentration of water, 1.72 g (84%) of clear liquid was obtained. 1H NMR (400 MHz, CDCl3) δ 6.72 (d, 1JHP=663.2 Hz, 1H); 31P NMR (161.97 MHz, CDCl3) δ 4.37 (d, JPH=664 Hz).

References:

US2014/303394,2014,A1 Location in patent:Paragraph 0036; 0056

Phosphorous acid Related Search:

普格县| 兴海县| 临江市| 阳西县| 江北区| 澄城县| 高要市| 普安县| 明星| 洞头县| 固阳县| 乐亭县| 寻甸| 鄂尔多斯市| 广饶县| 浏阳市| 赤壁市| 日照市| 都昌县| 乌鲁木齐市| 永靖县| 阳江市| 瓦房店市| 红河县| 尤溪县| 辽阳县| 新乡市| 虎林市| 宁明县| 佛学| 宁都县| 遂昌县| 增城市| 莱芜市| 城步| 乐安县| 葵青区| 邹平县| 水城县| 禄丰县| 潼南县|