Abstract: In our previous works (see ECSOC-15, 2008 and also 2 our accompanied communication) we found interesting dependencies of ortho- and meta-protons chemical shift (δ_o^H) in monoalkylbenzenes and disubstituted para-alkylaromatic compounds NMR ¹H spectra upon the place and degree of branching of alkyl chain. If this branching takes place at the α-carbon atom, the shift of basic spectral parameter – δ_i^H (δ_o^H or δ_m^H) - is observed and entitled as "α-effect"; the branching at β-carbon atom leads to another type shift ("β-effect"). The positive value of α- or β-effect means that δ_i^H value increases with the increasing of amount of methyl groups in α- or β-position; contrary, negative value of such effect mean decrease δ_i^H value. The natural question emerges: are α- and β-effects for phenyl ring carbon atoms existed too? We obtain the answer while studying NMR ¹H spectra of 26 especially selected rows of disubstituted para-alkylaromatic compounds N_n of the general formula p-Y-C₆H₄-(CH₂)_r-CR¹R²R³ (where r=0 or r=1). We examined as substituents "Y" 26 the most widespread groups from most electronegative (NO₂) to most electropositive (NMe₂). The variable fragments (R¹, R², R³) given in general formula are only hydrogen atom or methyl group. Depending upon the place of alkyl chain branching all compounds we divide into two types: the compounds of A type (r=0 in general formula), where the branching takes place at α-carbon atom and compounds of B type branched at β-carbon atom (r=1). The differential spectral parameters (Δδ_i^C) were used instead of basic ones (δ_i^C). The Δδ_i^C parameter means a difference between the value of studied carbon chemical shift δ_i^C,N(n) of the examined compound N_n and the same value δ_i^C,N(0) of the standard compound, where all variable substituents R¹ = R² = R³ = Н. The δ_i^C,N(0) and Δδ_i^C parameter values of all A and B type compounds are demonstrated in 5 tables. Averaged values of differential parameters were calculated, tabulated in additional 4 tables and pictured on 4 diagrams. In our communication we have a broad discussion of values and signs calculated for all types averaged differential parameters. The regular "structure-property" dependencies (α- and β-effects) which were founded only for δ₀^H,N(n) parameters, are also detected for 4 types of δ_i^C,N(n) parameters of studied disubstituted para-alkylaromatic compounds. Such α- and β-effects were observed for all examined differential spectral parameters Δδ_i^C,N(n) in all investigated rows of disubstituted para-alkylaromatic compounds. It should be stressed that for the investigated rows of compounds 1-26 there are no facts contradicting with the predicting values and signs of both α- and β-effects. The similar regular "structure-property" dependencies are also examined for ¹H NMR spectra parameters of other aromatic compounds in our accompanied communication, which we also want to sent now to ECSOC-15.