A Convenient Halogenation of α,β-Unsaturated Carbonyl Compounds with<i>OXONE</i>
<sup>®</sup>and Hydrohalic Acid (HBr, HCl)
作者:Kyoung-Mahn Kim、In-Hwan Park
DOI:10.1055/s-2004-831232
日期:——
Mixtures of OXONE ® and hydrobromic acid or hydrochloric acid afford solutions of bromine or chlorine, respectively. α-Bromo- or α-chloro-α,β-unsaturated carbonyl compounds were prepared by addition of hydrobromic acid or hydrochloric acid to the mixture of α,β-unsaturated carbonyl compounds and OXONE ® in CH2Cl2 followed by treatment of Et3N in moderate to good yields.
Reaction of Benzeneseleninyl Chloride with Olefins in the Presence of a Lewis Acid. A Novel One Step Vinylic Chlorination
作者:Nobumasa Kamigata、Takeshi Satoh、Masato Yoshida
DOI:10.1246/bcsj.61.449
日期:1988.2
In the presence of aluminum chloride benzeneseleninyl chloride was found to be an excellent vinylic chlorinating reagent of olefins under mild conditions. However, such olefins as styrene, trans-stilbene, and trans-1-phenylpropene afforded dichloro adducts under similar conditions. A plausible reaction mechanism involving positive chlorine intermediate is proposed.
Use of a fluorous bridge for diffusion controlled uptake of molecular chlorine in chlorine addition to alkenesElectronic supplementary information (ESI) available: experimental. See http://www.rsc.org/suppdata/cc/b3/b305629e/
作者:Jernej Iskra、Stojan Stavber、Marko Zupan
DOI:10.1039/b305629e
日期:——
Fluorous solvent was used for passive transport of molecular chlorine from one side of the U-tube to the other, where addition of chlorine to alkenes was quantitative and diffusion controlled.
and selenenylation of selenium-stabilized ester enolates have allowed the preparation of α-phenylselanyl esters 5, 7, 8 and of α,α-bis(phenylselanyl)esters 6, respectively. The competitive selenophilic reaction, leading to an allylic phenylselenide 9, was avoided in the presence of HMPA. α-phenylselanyl α,β-unsaturated esters 15 were prepared by oxidation of compounds 6 and dehydrohalogenation of β-chloroesters
烷基化和硒稳定酯烯醇化物的selenenylation已经允许α-phenylselanyl酯的制备5,7,8 α的和,α -双(phenylselanyl)酯6分别。在HMPA存在下,避免了竞争性的亲脂性反应,导致烯丙基苯基硒化物9。通过化合物6的氧化和β-氯代酯17的脱卤化氢制备α-苯基硒基α,β-不饱和酯15。还研究了其他一些转化:氧化,酯交换和格氏反应。Z酯的H 2 O 2氧化15导致产生稳定的E -α-硒烯酸酯20。
Reactions of α,β-Unsaturated Carboxylates, Malonates and Phenylacetates with Manganese(III) Acetate in the Presence of Chloride Ions
作者:Hiroshi Yonemura、Hiroshi Nishino、Kazu Kurosawa
DOI:10.1246/bcsj.60.809
日期:1987.2
The reaction of alkyl (E)-3-phenylpropenoates with manganese(III) acetate in the presence of Cl− ions gave alkyl (Z)-2-chloro-3-phenylpropenoates and alkyl 2,3-dichloro-3-phenylpropanoates. Ethyl (E)-2,3-diphenylpropenoate yielded ethyl 2,3-dichloro-2,3-diphenylpropanoate. Alkyl 3,3-diphenylpropenoates gave mainly alkyl 2-chloro-3,3-diphenyl-propenoates. Ethyl 1-cyclohexenecarboxylate gave ethyl 1