598-31-2Relevant articles and documents
Temperature Coefficients of the Rates of Acid-Catalyzed Enolization of Acetone and Ketonization of Its Enol in Aqueous and Acetonitrile Solutions. Comparison of Thermodynamic Parameters for the Keto-Enol Equilibrium in Solution with Those in the Gas Phase
Chiang, Y.,Kresge, A. J.,Schepp, N. P.
, p. 3977 - 3980 (1989)
Rates of hydrogen ion catalyzed enolization of acetone and ketonization of acetone enol were measured over a range of temperatures in water and in acetonitrile solution.The data give ΔH(excit.) = 20.0 +/- 0.1 kcal mol-1, ΔS(excit.) = -12.1 +/- 0.3 cal K-1 mol-1, and ΔH(excit.) = 20.1 +/- 0.5 kcal mol-1, ΔS(excit.) = -5.8 +/- 1.7 cal K-1 mol-1, for enolization in water and acetonitrile, respectively, and ΔH(excit.) = 9.7 +/- 0.4 kcal mol-1, ΔS(excit.) = -8.6 +/- 1.4 cal K-1 mol-1, and ΔH(excit.) = 11.4 +/- 0.2 kcal mol-1, Σ(excit.) = 1.6 +/-0.8 cal K-1 mol-1, for ketonization in water and acetonitrile, respectively.These values lead to ΔH0 = 10.3 +/- 0.4 kcal mol-1, ΔS0 = -3.5 +/- 1.5 cal K-1 mol-1, for the keto-enol equilibrium in water, and ΔH0 = 8.7 +/- 0.6 kcal mol-1, ΔS0 = -7.4 +/- 1.9 cal K-1 mol-1, for the equilibrium in acetonitrile.This is the first determination of thermodynamic parameters for a simple ketone-enol equilibrium in solution; the results are remarkably similar to the thermodynamic parameters for this reaction in the gas phase.A mechanism involving acid catalysis of the bromination of acetone enol by N-bromosuccinimide, the process used to monitor enolization in acetonitrile solution, is ruled out.
Effect of initial reagent concentrations on the oscillatory behavior of the BZ reaction in a batch reactor
Ganaie, Nadeem B.,Peerzada
, p. 650 - 657 (2009)
A detailed investigation on resorcinol as the Belousov-Zhabotinsky (BZ) oscillator in manganese(II) ion catalyzed reaction system with inorganic bromate (oxidant) and acetone (cosubstrate) was carried out in aqueous sulfuric acid medium (1.3 M). The aforesaid reagents were mixed with various concentrations to evolve the effective concentrations at which the reaction system exhibited better oscillations. The various oscillatory parameters such as time period (t p ), induction period (t in), frequency (v), amplitude (A), and number of oscillations (n) were derived, and the dependence of concentration of the reacting species on these oscillatory parameters was interpreted on the basis of the Field-Koros-Noyes mechanism. 2009 Wiley Periodicals, Inc.
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King et al.
, p. 5541,5542 (1970)
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Regioselective reactions on a 1,3-disubstituted dihydroxymethyl or dicarboxyl hexahydropentalene skeleton
T?nase, Constantin I.,Dr?ghici, Constantin,Shova, Sergiu,Cojocaru, Ana,Maganu, Maria,Munteanu, Cristian V.A.,Cocu, Florea
, p. 6852 - 6859 (2015)
Iodo-, bromo-, chloro-etherification and oxymercuration-demercuration of hexahydropentalene 1,3-dimethanol were regioselectively realized with formation of pentalenofurane compounds in good yields. The corresponding hexahydropentaleno diacid and its monoester react regioselectively with MCPBA to give two γ-lactones. Haloetherification of the diacid also regioselectively gives halogenolactones in good yield. A new method for synthesis of a bislactone was developed in better yield (79%) than that presented in the literature (58%).
Fluorescent azasteroids through ultrasound assisted cycloaddition reactions
Mangalagiu, Ionel,Moldoveanu, Costel,Zbancioc, Gheorghita
, (2021/08/30)
We report here the synthesis and optical spectral properties of several new azasteroid derivatives. The formation of these compounds was explained based on the most probable mechanism. The luminescent heterocycles were synthesized by 1,3‐dipolar cycloaddition reactions between benzo[f]quinoline and methylpropiolate or dimethyl acetylenedicarboxylate (DMAD). A selective and efficient way for [3+2]‐dipolar cycloaddition of benzo[f]quinolinium ylides under ultrasound (US) irradiation (20 kHz processing frequency) is presented. We report substantially higher yields under US irradiation, whereas the solvent amounts required are at least three‐fold less compared to classical heating. The azasteroid derivatives are blue emitters with λmax of fluorescence around 430–450 nm. A certain influence of the azasteroid substituents concerning absorption and fluorescent properties was observed. Compounds anchored with a bulky pivaloyl group or without a C=O carbonyl group have shown increased fluorescence intensity.
Diastereoselective Synthesis of Z-Alkenyl Disulfides from α-Thiophosphorylated Ketones and Thiosulfonates
Musiejuk, Mateusz,Doroszuk, Justyna,J?drzejewski, Bartosz,Ortiz Nieto, Gregory,Marin Navarro, Marisol,Witt, Dariusz
supporting information, p. 618 - 626 (2019/12/24)
We developed a simple and efficient method for the synthesis of functionalized unsymmetrical Z-alkenyl disulfides under mild conditions in moderate to good yields. The designed method is based on the reaction of α-thiophosphorylated carbonyl compounds with thiotosylates in the presence of a base. The developed method allows the preparation of unsymmetrical Z-alkenyl disulfides bearing additional hydroxy, carboxy, or ester functionalities. (Figure presented.).
METHOD OF CONTROLLING PLANTS
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Page/Page column 29, (2018/02/28)
The present invention provides a method of controlling plants comprising applying to the plants, or to the locus of the plants a composition comprising (A) a compound of formula (I) selected from the group consisting of: Formula(I), or an N-oxide or salt form thereof, and (B) one or more further herbicides.
