**1. Introduction**

Di(n‐ and isononyl)cyclohexane‐1,2‐dicarboxylate (DINCH) isomers are considered to be relatively safe substitutes of the corresponding phthalates, especially when used in the manufacturing of various medical devices and toys. For this reason there is a great interest in the analysis of their isomers by different analytical methods.

In this chapter, we present the results of the application of the different modern chromato‐ graphic and spectrometric analytical techniques, such as gas chromatography (GC), electro‐ spray‐mass spectrometry (ESI/MS), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), gas chromatography‐mass spectrometry (GC/MS), and others similar ones to the identification of the new generation additives.

They were obtained in the catalytic hydrogenation reactions in the presence of the Ni catalyst and used as plasticizers and cross‐linking agents to some polymers, such as poly(vinyl chloride) (PVC) or epoxy resins.
