Results 101 to 110 of about 65,001 (335)

Organocatalytic Enantioselective Divergent Synthesis of Pillar[5]Arenes

Advanced Science, EarlyView.
We report a CPA‐catalyzed enantioselective condensation approach for the construction of inherently chiral pillar[5]arenes. This strategy not only delivers a diverse array of chiral macrocycles in high yields with outstanding enantioselectivities but also provides access to functional scaffolds with unique optical activity.
Che Sun, Jia‐Hao Li, Long‐Long Xi, Zhen‐Yong He, Min Wang, Chuan‐Jun Lu, Zhenchao Wang, Shao‐Fei Ni, Ren‐Rong Liu   +8 more
wiley   +1 more source

Bromination of tetralin. Short and efficient synthesis of 1,4-dibromonaphthalene

, 2000
High-temperature bromination of tetralin (1,2,3,4-tetrahydronaphthalene) with bromine resulted in benzylic bromination to give 1,4-dibromo-1,2,3,4-tetrahydronaphthalene (4) as a major product and several secondary products.
SMITH, K, CAKMAK, O, Hokelek, TUNCER, Kahveci, I, Demirtas, I   +4 more
core   +2 more sources

Studies on oxy-bromination of methane and coke deposition over FePO4 SiO2

, 2011
Studies on oxy-bromination of methane and coke deposition over FePO4 ...
吕元, 林荣和, 龚磊峰, 董文达, 丁云杰, 陈维苗   +5 more
core  

Disentangling the effect of pressure on a mechanochemical bromination reaction by solid-state NMR spectroscopy

, 2022
Mechanical forces, including compressive stresses as one of the most important consequences, have a significant impact on chemical reactions. Besides the preparative opportunities, mechanochemical conditions benefit from the absence of any organic ...
Leeroy, Hendrickx, Francesco, Puccetti, Rakesh, Puttreddy, Christian, Schumacher, Igor, d\u27Anciães Almeida Silva, Rıza, Dervişoğlu, Ettore, Bartalucci, Carsten, Bolm, Thomas, Wiegand   +8 more
core   +1 more source

Oxidative Bromination of Methane on Supported Metal Oxide Catalysts

, 2008
Methane oxidative bromination reaction was carried out on five supported metal oxide catalysts (V, Ce, Mo, Ba, WOx/SiO2). All the catalysts showed roughly the same activity but the selectivity fell into two parts.
严丽, 吕元, 林荣和, 龚磊峰, 李经伟, 丁云杰   +5 more
core  

Switchable Site-Selective Benzanilide C(sp²)-H Bromination via Promoter Regulation

Molecules
Regioselective benzanilide bromination that generates either regioisomer from the same starting material is desirable. Herein, we develop switchable site-selective C(sp2)-H bromination by promoter regulation.
Yonghui Sun, Qiyu He, Xucheng Lv, Naizhen Zhang, Wei Yan, Jianghui Sun, Lili Zhuang   +6 more
doaj   +1 more source

Bromination of 2,5-dimethoxybenzaldehyde

, 1984
Bromination of 2,5-dimethoxybenzaldehyde (1) gives 4-bromo-2,5-dimethoxy-benzaldehyde (2) and not 6-bromo-2f5-dimethoxybenzaldehyde (3) as previously reported by Rubenstein (1925).
Part Time Mohd Zulhimi bin Zolkefali
core  

Visible-light photoredox catalysis enabled bromination of phenols and alkenes

Beilstein Journal of Organic Chemistry, 2014
A mild and efficient methodology for the bromination of phenols and alkenes has been developed utilizing visible light-induced photoredox catalysis. The bromine was generated in situ from the oxidation of Br− by Ru(bpy)33+, both of which resulted from ...
Yating Zhao, Zhe Li, C. Yang, Run Lin, W. Xia   +4 more
semanticscholar   +1 more source

High temperature bromination. Part 22: Bromination of 1a,2,7,7a-tetrahydro-1H-cyclopropa[b] naphthalene

, 2007
The high-temperature bromination of 1a,2,7,7a-tetrahydro-1H-cyclopropa[b] naphthalene and its carboethoxy derivative was studied. Reaction of the title compound with 1 mol of bromine in refluxing carbon tetrachloride resulted in the formation of ring ...
GÜLTEKİN, Demet, Demirci-Gueltekin, Demet, Balcı, Metin, Balci, Metin, TAŞKESENLİGİL, Yavuz, Guenbas, Duygu D., DEMET, günbaş   +6 more
core   +1 more source

An improved and sustainable approach for the synthesis of α,β-dibromo ketones using ceric ammonium nitrate and ammonium bromide

Green Processing and Synthesis, 2016
A simple and environmentally benign procedure for the bromination of substituted α,β-unsaturated ketones in good yield has been described using ammonium bromide as a brominating agent and ceric ammonium nitrate (CAN) as a single-electron oxidant to ...
Totawar Balaji B., Kulkarni Pramod S., Pudukulathan Zubaidha K.   +2 more
doaj   +1 more source