天堂网亚洲,天天操天天搞,91视频高清,菠萝蜜视频在线观看入口,美女视频性感美女视频,95丝袜美女视频国产,超高清美女视频图片

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 2,7-DIBROMO-9H-CARBAZOLE
136630-39-2

2,7-DIBROMO-9H-CARBAZOLE synthesis

11synthesis methods
-

Yield:136630-39-2 82.5%

Reaction Conditions:

with triphenylphosphine in 1,2-dichloro-benzene at 180; for 3 h;

Steps:

6.3.6 2,7-Dibromo-9H-carbazole (11)

A solution of compound 10 (24.13g, 67.54mmol) and PPh3 (44.27g, 168.88mmol) in o-dichlorobenzene (120mL) was stirred at 180°C for 3h. After cooled down to r.t., the reaction mixture was purified by column chromatography on silica gel using dichloromethane-hexane (1:5) as the eluent to give the final purified product as white-off solids with yield of 82.5% (18.09g). 1H NMR (300MHz, (CD3)2SO) δ: 11.55 (s, 1H, -NH), 8.13-8.10 (d, J=8.4Hz, 2H, H5), 7.75-7.74 (d, J=1.5Hz, 2H, H2), 7.37-7.34 (dd, J1=8.4Hz, J2=1.8Hz, 2H, H4); 13C NMR (75MHz, (CD3)2SO) δ: 141.74 (C1), 123.05 (C4), 122.89 (C5), 121.95 (C6), 119.66 (C3), 114.81 (C2); HRMS-EI (m/z): [M]+ calcd for C12H7Br2N, 322.8945; found 322.8938 [(79Br) (79Br)M]+, 324.8950 [(79Br) (81Br)M]+, 326.8954 [(81Br) (81Br)M]+.

References:

Lin, Tzu-Chau;Chien, Wei;Dai, Shu-Wen;Lin, Hao-Wu;Liu, Yueh-Ching [Dyes and Pigments,2019,vol. 168,p. 140 - 150]

2,7-DIBROMO-9H-CARBAZOLE Related Search: