- Chlorinating preparation method for low-carbon olefins
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The invention discloses a chlorinating preparation method for low-carbon olefins. According to the method, chlorine gas is diluted with inert gas and then reacts with low-carbon olefins, thus, influence caused by microscopic mixing can be obviously reduced, namely, a too high local temperature can be avoided, thus, side reactions including a decarbonization phenomenon caused by the too high localtemperature can be obviously reduced, and a relatively good chloride yield can be obtained.
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Paragraph 0037; 0039
(2020/01/12)
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- Method for co-producing methyl chloropropene and 2-chloro-2-methylpropane by chlorination of isobutene
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The invention discloses a method for co-producing methyl chloropropene and 2-chloro-2-methylpropane by chlorination of isobutene. According to the method, a chlorination reaction is carried out on chlorine or a mixture of chlorine and inert gas and excessive isobutene to obtain products, namely methyl chloropropene and 2-chloro-2-methylpropane. The method can reduce influence of micro-mixing on arapid chlorination reaction of isobutene, decarburization and coking do not occur easily, and 2-chloro-2-methylpropane can be co-produced while the yield of methyl chloropropene is improved.
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Paragraph 0025; 0026
(2020/01/12)
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- Visible Light-Induced Oxidative Chlorination of Alkyl sp3 C-H Bonds with NaCl/Oxone at Room Temperature
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A visible light-induced monochlorination of cyclohexane with sodium chloride (5:1) has been successfully accomplished to afford chlorocyclohexane in excellent yield by using Oxone as the oxidant in H2O/CF3CH2OH at room temperature. Other secondary and primary alkyl sp3 C-H bonds of cycloalkanes and functional branch/linear alkanes can also be chlorinated, respectively, under similar conditions. The selection of a suitable organic solvent is crucial in these efficient radical chlorinations of alkanes in two-phase solutions. It is studied further by the achievement of high chemoselectivity in the chlorination of the benzyl sp3 C-H bond or the aryl sp2 C-H bond of toluene.
- Zhao, Mengdi,Lu, Wenjun
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supporting information
p. 4560 - 4563
(2017/09/11)
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- Direct chlorination of alcohols with chlorodimethylsilane catalyzed by a gallium trichloride/tartrate system under neutral conditions
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The reaction of secondary alcohols 1 with chlorodimethylsilane (HSiMe 2Cl) proceeded in the presence of a catalytic amount of GaCl 3/diethyl tartrate to give the corresponding organic chlorides 3. In the catalytic cycle, the reaction of diethyl tartrate 4a with HSiMe 2Cl 2 gives the chlorosilyl ether 5 with generation of H2. Alcohol-exchange between the formed chlorosilyl ether 5 and the substrate alcohol 1 affords alkoxychlorosilane 6, which reacts with catalytic GaCl 3 to give the chlorinated product 3. The moderate Lewis acidity of GaCl3 facilitates chlorination. Strong Lewis acids did not give product due to excessive affinity for the oxy-functionalities. Although tertiary alcohols were chlorinated by this system even in the absence of diethyl tartrate, certain alcohols that are less likely to give carbocationic species were effectively chlorinated using the GaCl3/diethyl tartrate system. The Royal Society of Chemistry.
- Yasuda, Makoto,Shimizu, Kenji,Yamasaki, Satoshi,Baba, Akio
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supporting information; experimental part
p. 2790 - 2795
(2009/02/03)
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- Quaternary ammonium polychlorides as efficient reagents for chlorination of unsaturated compounds
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Chlorination of unsaturated compounds by benzyltributylammonium polychlorides results in higher yields of addition products compared to those obtained with molecular chlorine.
- Zelikman,Tyurin,Smirnov,Zyk
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p. 1541 - 1546
(2007/10/03)
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- Trimethylchlorosilane and water. Convenient reagents for the regioselective hydrochlorination of olefins
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The hydrochlorination of a series of simple and functionalized olefins in high yields was readily accomplished using a mixture of trimethylchlorosilane and water. Hydrochlorination by this procedure is chemoselective and regioselective.
- Boudjouk, Philip,Kim, Beon-Kyu,Han, Byung-Hee
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p. 3479 - 3484
(2007/10/03)
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- Bromochlorination of Alkenes with Dichlorobromate (1-) ion. IV. Regiochemistry of Bromochlorinations of Alkenes with Molecular Bromine Chloride and Dichlorobromate (1-) Ion
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The regioselectivity of the addition of molecular bromine chloride to alkenes is dependent on both the steric and electronic effects of the alkyl substituent.In contrast, the regioselectivity of the addition of dichlorobromate (1-) ion to alkenes is controlled mainly by the steric effect of the substituent.
- Negoro, Takeshi,Ikeda, Yoshitsugu
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p. 2547 - 2552
(2007/10/02)
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- Synthesis and Characterization of Polychlorinated Isobutenes
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The preparation of polychlorinated methallylic chlorides by continuous chlorination of isobutene with different ratios of chlorine and following HCl-elimination is described.The structure is proved by reaction of the polychlorinated isobutenes with sodium thiolacetate and potassium thiocyanate and by spectroscopic methods.
- Schulze, K.,Hartmann, S.,Krueger, H.,Muehlstaedt, M.,Richter, C.,Richter, H.
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p. 433 - 442
(2007/10/02)
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- Three Component Reactions. XVI. Halogenation of Alk-1-enes in the Presence of Ethylene Oxide and Propylene Oxide
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The products of the chlorination of alk-1-enes in the presence of ethylene oxide and propylene oxide were investigated in relation to products of the chlorination in the presence of corresponding chloroalcohols 4 and 5.Isomers dominating in the Markovnikov orientation were found in all cases.Two of the three pairs of diastereomeric bischloropropylethers expected for the chlorination of propene in the presence of propylene oxide were identified by capillar GLC and 13C n.m.r. spectroscopy.
- Beger, J.,Schiefer, H.,Scheller, D.
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p. 719 - 728
(2007/10/02)
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