scispace - formally typeset
Search or ask a question
Topic

Acetone

About: Acetone is a research topic. Over the lifetime, 9458 publications have been published within this topic receiving 120867 citations. The topic is also known as: propanone & dimethylketone.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors investigated the short and long-term effect of adding water to acetone and methanol extracts from two marine phytoplankton species, Emiliania hyxleyi and Dunaliella tertiolecta.
Abstract: RPHPLC methods for analysis of photosynthetic pigments (chlorophylls and carotenoids) usually require addition of water to methanol or acetone extracts to prevent distortion of early-eluting peaks corresponding to the more polar compounds. In this work we have investigated the short-(<2 min) and long-term (up to 48 h) effect of adding water to acetone and methanol extracts from two marine phytoplankton species,Emiliania hyxleyi andDunaliella tertiolecta. Solvent extracts were prepared and separated into fractions that were subsequently diluted with water to 90%, 80%, 70%, 60%, 50%, and 40% for methanol, and the same range extended to 30% and 20% for acetone. Changes in pigment concentration with time were followed spectrophotometrically and chromatographically. Losses of pigments as a result of precipitation were clearly observed immediately after dilution of acetone extracts to 60% or less and methanol extracts to 80% or less. For chlorophyll a the most substantial losses were recorded for 50% acetone (up to 27% decrease) and for 70% methanol (31% decrease). This effect increased considerably with time. Only for 90% and 80% acetone were the initial concentrations of all the pigments unchanged after 24h, and even up to 48 h. In contrast, more than 60% and 57% of the initial amounts of chlorophyll a were lost after 24 h in 50% acetone and 70% methanol extracts, respectively. These losses increased to 83% and 60% after 48 h. There was a clear correlation between the polarity of a pigment and the polarity of the solvent at which maximum precipitation occurred. Losses of pigment from pure acetone and methanol extracts with time were also observed, although we attribute these to pigment degradation rather than precipitation. Some of the losses occurring with time can be avoided by use of autosamplers in which the sample can be mixed with water immediately before injection.

61 citations

Journal ArticleDOI
TL;DR: In this article, the products of the reaction of OH with acetone were investigated using a discharge flow tube coupled to a chemical ionization mass spectrometer, and the rate coefficients for the reaction were measured with this system to be the same as those reported in part 1 (J. Phys. A 2003, 107, 5014).
Abstract: The products of the reaction of OH with acetone (OH + CH3C(O)CH3 → products) were investigated using a discharge flow tube coupled to a chemical ionization mass spectrometer. It was shown that the yield of acetic acid from the reaction was less than 1% between 237 and 353 K. The yield of acetonyl radical was measured to be (96 ± 11)%, independent of temperature, between 242 and 350 K. The rate coefficients for the reaction were measured with this system to be the same as those reported in part 1 (J. Phys. Chem. A 2003, 107, 5014). The rate coefficients for the removal of OH (v = 1) by acetone and acetone-d6 were shown to be (2.67 ± 0.15) × 10-11 and (3.45 ± 0.24) × 10-11 cm3 molecule-1 s-1, respectively, at 295 K. It was shown that the enthalpy of reaction for the formation of an OH−acetone adduct is more than −8 kcal mol-1 (i.e., the adduct is bound by at most 8 kcal mol-1) at 203 K. On the basis of these observations and those from part 1, we deduce that the reaction of OH with acetone occurs through a ...

61 citations

Journal ArticleDOI
TL;DR: In this paper, a method for the aldol condensation of acetone with aromatic and aliphatic aldehydes, using morpholinium trifluoroacetate as a catalyst, is described.
Abstract: We report a highly efficient, general and practical method for the aldol condensation of acetone with aromatic and aliphatic aldehydes, using morpholinium trifluoroacetate as a catalyst.

61 citations


Network Information
Related Topics (5)
Aqueous solution
189.5K papers, 3.4M citations
91% related
Reagent
60K papers, 1.2M citations
89% related
Alkyl
223.5K papers, 2M citations
88% related
Adsorption
226.4K papers, 5.9M citations
87% related
Ionic liquid
57.2K papers, 1.6M citations
86% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023663
20221,301
2021169
2020193
2019259
2018226