Esters of succinic acid derivatives have been synthesized. The dependence of their viscosity-temperatureproperties on the structure of the side radicals has been studied. Esters of hexa-2-enylsuccinic, cyclohexa-2-enylsuccinic, and benzylsuccinic acids have been chosen for a comparison.Several esters of dicarboxylic acids (dicarboxylates) are used on industrial scale as lubricating oils in devices that operate in a wide temperature range and as hydraulic fluids [1,2].It is well known that various viscosity-temperature properties can be imparted to esters by altering their molecular structure. So, by studying the dependence of the chemical and performance properties of the esters, we can accomplish targeted synthesis with desired results.Based on dicarboxylic esters (dicarboxylates), new types of synthetic oils superior to industrial synthetic ester oils in viscosity-temperature characteristics, thermooxidative stability, and lubrication properties have been developed at INKhP NAN (Institute of Petrochemical Processes of the Azerbaijan National Academy of Sciences) on a laboratory scale. This paper is devoted to synthesis of alkenylsuccinic acid esters (alkenyl succinates) of various modifications and to studies of their viscosity-temperature properties. The synthesized esters of hexa-2-enylsuccinic (HSA), cyclohexa-2-enylsuccinic (CSA), and benzylsuccinic (BSA) acids were chosen for a comparison. The esters of HSA and CSA are proposed as the bases and components of the synthetic oils [3, 4].Anhydrides of substituted succinic acids (hexa-2-enylsuccinic and cyclohexa-2-succinic) were obtained by ene-synthesis of maleic anhydride with a-olefins (especially with hexene-1) and with cyclohexene. The physicochemical characteristics of these anhydrides are listed in Table 1.Benzylsuccinic anhydride was obtained by reacting maleic anhydride with toluene [5].Based on these anhydrides and C 4 -C 10 aliphatic alcohols, esters of the following general formula were synthesized:
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