Dibrominated addition and substitution of alkenes catalyzed by Mn<sub>2</sub>(CO)<sub>10</sub>
作者:Xianheng Song、Shanshui Meng、Hong Zhang、Yi Jiang、Albert S. C. Chan、Yong Zou
DOI:10.1039/d1cc04534b
日期:——
A practical method for the dibromination of alkenes without using molecular bromine is consistently appealing in organic synthesis. Herein, we report Mn-catalyzed dibrominated addition and substitution of alkenes only with N-bromosuccinimide, producing a variety of synthetically valuable dibrominated compounds in moderate to high yields.
Darstellung, NMR- und IR-spektren von 2,3-dibrom- und 2-jod-3-chlor-1,3-diphenylpropanonen-(1)
作者:F.G. Weber
DOI:10.1016/s0040-4020(01)82967-7
日期:1969.1
Reaction of IC1 with chalcones yielded 2-iodo-3-chloro-1,3-diphenylpropanones-(1) (II), which were identified by their 1H-NMR spectra as erythro isomers. The IR spectra of the II were compared with the IR spectra of the 2,3-dibromo compounds (I) in the range of 400 to 700 cm−1 and in the carbonyl frequency region.
SYNTHESIS AND C-S BOND FISSION OF 1,3-DIARYL-3-THIOGLYCOLIC ACID-1-PROPANONES
作者:Mohamed E. Elba
DOI:10.1080/10426500008043683
日期:2000.5.1
1,3-Diaryl-3-thioglycolic acid-1-propanones 3a-k have been synthesized by the reaction of either erythro-2,3-dibromo-1,3-diaryl-1-propanones 1a-k or their corresponding trans-chalcones 2(a-k) with disodio-thioglycolate in absolute ethanol. The structure of the products was proven by UV, IR, NMR spectra and elemental analysis. A reaction mechanism leading to the products, and the carbon-sulfur bond fission in alkaline medium were discussed.
Catalyst-Free 1,2-Dibromination of Alkenes Using 1,3-Dibromo-5,5-dimethylhydantoin (DBDMH) as a Bromine Source
作者:Lei Wang、Lele Zhai、Jinyan Chen、Yulin Gong、Peng Wang、Huilin Li、Xuegong She
DOI:10.1021/acs.joc.1c02906
日期:2022.3.4
source. This reaction proceeds under mild reaction conditions without the use of a catalyst and an external oxidant. Various sorts of alkene substrates are transformed into the corresponding 1,2-dibrominated products in good to excellent yields with broad substrate scope and exclusive diastereoselectivity. This method offers a green and practical approach to synthesize vicinaldibromide compounds.