2155-94-4Relevant articles and documents
218. INTRAMOLECULAR CYCLIZATION OF AN AMMONIUM SALT CONTAINING AN ALLYL SUBSTITUENT IN POSITION 1 OF THE DIENE FRAGMENT
Chukhadzhyan, E. O.,Chukhadzhyan, El. O.,Shakhatuni, K. G.,Manasyan, L. A.,Babayan, A. T.
, p. 192 - 195 (1994)
It has been shown that, under basic catalytic conditions, dimethylpropargylallyl-(1-allyl-3-phenylpropargyl)- and -(1-allyl-3-α-naphthylpropargyl)ammonium salts undergo diene synthesis type intramolecular cyclization to form condensed analogs of isoindolenium and dihydroindolenium salts with an allyl substituent at position 1.
High-yield preparation method of high-purity dimethyl diallyl ammonium chloride monomer
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Paragraph 0060-0068; 0072-0080, (2019/03/31)
The invention belongs to the technical field of organic synthesis, and specifically relates to a high-yield preparation method of a high-purity dimethyl diallyl ammonium chloride monomer. According tothe preparation method provided by the invention, a segmented type chloropropene and sodium hydroxide solution alternative and dropwise adding method is adopted, the most suitable alternative and dropwise adding amount and the most suitable reaction time of the chloropropene and the sodium hydroxide solution can be found through a large amount of small-scale tests and by adopting an acid-base indicator, the chloropropene can be prevented from being located in strong base environment, a large amount of byproducts such as allyl alcohol can be effectively prevented from being generated, the utilization rate of the chloropropene can be effectively increased, and by adopting a pressure-proof closed reaction kettle, dimethylamine is enabled not to leak and can completely take part in reaction.A dimethyl diallyl ammonium chloride monomer solution obtained through the preparation method is light in color and less in impurities, activated carbon is not used for decoloring and removing the impurities, the purity is high, the contents of amine salt and chlorine ions are extremely low, the yield is approximate to ideal value, a product is used for homopolymerization experiments, a colorless,transparent and clear polymer solution is obtained, and the viscosity and the molecular weight of the colorless, transparent and clear polymer solution are far higher than those of like products.
Gold-Ligand-Catalyzed Selective Hydrogenation of Alkynes into cis-Alkenes via H2 Heterolytic Activation by Frustrated Lewis Pairs
Fiorio, Jhonatan L.,López, Núria,Rossi, Liane M.
, p. 2973 - 2980 (2017/05/31)
The selective hydrogenation of alkynes to alkenes is an important synthetic process in the chemical industry. It is commonly accomplished using palladium catalysts that contain surface modifiers, such as lead and silver. Here we report that the adsorption of nitrogen-containing bases on gold nanoparticles results in a frustrated Lewis pair interface that activates H2 heterolytically, allowing an unexpectedly high hydrogenation activity. The so-formed tight-ion pair can be selectively transferred to an alkyne, leading to a cis isomer; this behavior is controlled by electrostatic interactions. Activity correlates with H2 dissociation energy, which depends on the basicity of the ligand and its reorganization on activation of hydrogen. High surface occupation and strong Au atom-ligand interactions might affect the accessibility and stability of the active site, making the activity prediction a multiparameter function. The promotional effect found for nitrogen-containing bases with two heteroatoms was mechanistically described as a strategy to boost gold activity. (Graph Presented).
