Alkynediols are obtained by reaction of ketones with acetylene in the presence of a base, which was previously done in organic solvents such as acetaldehyde dibutyl acetal, methylal, dioxane, diisopropyl ether, tetrahydrofuran or hydrocarbons. In most cases, these suspensions are highly viscous. ...
Preparation of Fluorescent Hyperbranched Poly(aryl ether ketone)s via A_2+B_3 Reaction Hyperbranched poly(aryl ether ketone)s(HPETFDEK-F) were synthesized from the combination of 3,3′,5,5′,-tetramethyl biphenyl-4,4′-diol(A_2) and B_3,a nov... 牟建新,张春玲,王贵宾,... - 《高等...
The reaction can be scaled up to gram scale, even with a lower catalyst loading (Fig.4a). When 2 mol% Ir(COD)2BF4/(R,Ra)-L6was used, 1.675 g of chiral homoallylic amine3wwas obtained fromn-propylamine and allylic carbonate2bin 82% yield with 93% ee. The products,3, which w...
reaction completion.586Aside from this particular difference, the reaction is similar to theallylation of aldehydes, in that mostlyLewis acidssuch as boron-,587magnesium-,294lead-,588andindium560a,589have been used in the context of simple and/or stereoselective allylations. A few reports have ...
The reaction of methyl ketones such as methyl ethyl and methyl isobutyl ketones with acetylene via base-catalyzed ethynylation yields tertiary acetylenic diols. These compounds containing the 1,4-dihydroxyacetylenic grouping at carbon chain lengths of eight or higher are superior surfactants. They are...
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The DMF solution (5 ml) of dibromide 6 (123 mg, 0.1 mmol) and diol 9 (184 mg, 0.2 mmol) was then dropped at 150 1C over 6 h. The reaction mixture was stirred at 150 1C for 72 h. The solvent was reduced to 5 ml under reduced pressure. The concentrated mixture was poured ...
(1) calcium acetate is obtained from acetic acid and then decomposed to acetone;(2) Acetylene reacts with water vapor on zinc oxide catalyst to produce acetone;(3) ethanol vapor in the presence of zinc chromate catalyst, high temperature reaction to generate acetone;(4) liquefied natural gas ...
A chloroketone is a compound that is obtained by treating chroman-4-ones with PCl5, resulting in the isolation of the compound from the reaction of 2,2-dimethylchroman-4-one and phosphorus pentachloride. AI generated definition based on: Comprehensive Heterocyclic Chemistry, 1984 ...
[reaction: see text] The sesquiterpene (+/-)-herbertenolide was synthesized in seven steps from commercial 2-bromo-4-methylanisole. In the key step, two adjacent stereogenic quaternary centers were controlled by a highly chemoselective and stereospecific photodecarbonylation reaction of crystalline meth...