Hydrogenation of unsaturated dicarboxylic acids by dicarbonylbis(.eta.5-cyclopentadienyl)titanium(II) and molecular structure of (.mu.-acetylenedicarboxylato)bis[bis(.eta.5-methylcyclopentadienyl)titanium(III)]

1986 ◽  
Vol 25 (1) ◽  
pp. 98-102 ◽  
Author(s):  
David R. Corbin ◽  
J. L. Atwood ◽  
Galen D. Stucky
Keyword(s):  
Molecular Structure ◽  
Dicarboxylic Acids

scholarly journals Influence of organic compound functionality on aerosol hygroscopicity: dicarboxylic acids, alkyl-substituents, sugars and amino acids

2017 ◽  
Vol 17 (9) ◽  
pp. 5583-5599 ◽  
Author(s):  
Aleksandra Marsh ◽  
Rachael E. H. Miles ◽  
Grazia Rovelli ◽  
Alexander G. Cowling ◽  
Lucy Nandy ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Amino Acids ◽  
Organic Compounds ◽  
Accurate Determination ◽  
Dicarboxylic Acids ◽  
Original Data ◽  
Set Up ◽  
Complex Organic ◽  
Selection Of

Abstract. Hygroscopicity data for 36 organic compounds, including amino acids, organic acids, alcohols and sugars, are determined using a comparative kinetics electrodynamic balance (CK-EDB). The CK-EDB applies an electric field to trap-charged aqueous droplets in a chamber with controlled temperature and relative humidity (RH). The dual micro dispenser set-up allows for sequential trapping of probe and sample droplets for accurate determination of droplet water activities from 0.45 to > 0.99. Here, we validate and benchmark the CK-EDB for the homologous series of straight-chain dicarboxylic acids (oxalic–pimelic) with measurements in better agreement with Universal Quasichemical Functional Group Activity Coefficients (UNIFAC) predictions than the original data used to parametrise UNIFAC. Furthermore, a series of increasingly complex organic compounds, with subtle changes to molecular structure and branching, are used to rigorously assess the accuracy of predictions by UNIFAC, which does not explicitly account for molecular structure. We show that the changes in hygroscopicity that result from increased branching and chain length are poorly represented by UNIFAC, with UNIFAC under-predicting hygroscopicity. Similarly, amino acid hygroscopicity is under-predicted by UNIFAC predictions, a consequence of the original data used in the parametrisation of the molecular subgroups. New hygroscopicity data are also reported for a selection of alcohols and sugars and they show variable levels of agreement with predictions.

scholarly journals Use of Carboxylic Acid Ester as Lubricant Component

2021 ◽  
Vol 135 (4) ◽  
pp. 7-9
Author(s):  
V. A. Zavorotny ◽  
◽  
I. V. Podkovyrova ◽  
Keyword(s):  
Molecular Structure ◽  
Carboxylic Acid ◽  
Viscosity Index ◽  
Dicarboxylic Acids ◽  
Caproic Acid ◽  
High Viscosity ◽  
Mineral Oil ◽  
Effect Of Temperature ◽  
Esterification Reaction ◽  
Theoretical Foundations

This paper discusses the use of esters of dicarboxylic acids as components of lubricants. Influence of molecular structure on the properties of ester compositions and the course of the esterification reaction. The theoretical foundations for the production of esters, the synthesis of the ester of caproic acid and butyldiglycol are considered, and the effect of temperature on the esterification process is reflected. Samples of a semi-synthetic oil were prepared, consisting of mineral oil and an ester of various concentrations. The viscosity and density were determined, the viscosity index of the samples under study was calculated. An oil with an optimal concentration of an ester and a high viscosity index was selected.

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