成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
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-Pyridinecarbonitrile,4-hydroxy-(9CI)
475057-86-4

2-Pyridinecarbonitrile,4-hydroxy-(9CI) synthesis

1synthesis methods
-

Yield:-

Reaction Conditions:

with hydrogen bromide

Steps:

5.B (B)

(B) 4-Hydroxy-2-pyridinecarbonitrile 4-Methoxy-2-pyridinecarbonitrile (544 mg, 4.055 mmol) was added with 47% hydrobromic acid (6 ml) and refluxed by heating at 130° C. The reaction solution was stirred for 22 hours, returned to room temperature, and then concentrated under reduced pressure. The residue was subjected to azeotropy with toluene and diethyl ether to remove excessive hydrobromic acid. The resulting white crystals were washed with diethyl ether to obtain 1.47 g of the title compound containing hydrogen bromide without purification. 1H-NMR (CD3OD) δ: 7.48 (1H, dd, J=2.44, 6.83 Hz), 7.81 (1H, d, J=2.44 Hz), 8.63 (1H, d, J=6.83 Hz)

References:

US2003/92720,2003,A1

2-Pyridinecarbonitrile,4-hydroxy-(9CI) Related Search: