Abstract: In our previous work (see ECSOC-12, 2008) we found some interesting dependencies of ortho-protons chemical shift (δ_o^H) in monoalkylbenzenes NMR ¹H spectra upon the place and degree of branching of alkyl chain. If the branching takes place at the α-carbon atom, the downfield shift of basic spectral parameter - δ_o^H - (α-effect) is observed and entitled as "α-effect"; the branching at β-carbon atom leads to the shift toward upfield ("β-effect"). α-Effect has a positive value because δ_o^H value increases with the increase of amount of methyl groups in α-position, contrary, β-effect has a negative value. The natural question emerges: which other classes of aromatic compounds (in addition to monoalkylbenzenes) the founded regularities apply to? We obtain the answer while studying NMR ¹H spectra of 17 especially selected rows of monoalkylbenzenes with functional groups in alkyl substituent. Extended interpretation of the term "functional groups" allows to examine alkyl groups with multiple bonds C=C, CºC and C=O as a functionalized fragment. Depending upon the place of alkyl chain branching all compounds are divided into two types. In the compounds of A type the branching takes place at α-carbon atom and in the compounds of B type – at β-carbon atom. The variable fragments may be only hydrogen atom or methyl group. The use of differential spectral parameters (Δδ^Н_о) instead of basic ones (δ_о^Н) is more advisable because of the great scattering of δ_о^Н,N(n) values. The differential spectral parameter is a difference between the value of ortho-protons chemical shift δ_о^Н,N(n) of the investigated compound N_n and the same value δ_о^Н,N(0) of the standard compound, when all variable substituents R¹ = R² = R³ = Н. The δ^Н_о and Δδ^Н_о values of all A and B type compounds are demonstrated in 2 tables and 2 diagrams. The new regular "structure-property" dependencies which were determined for nonfunctionalized monoalkylbenzenes are observed for all values of basic spectral parameters δ₀^{H, N(n)} in the investigated rows of monoalkylbenzenes substituted by functional substituents in the side chain. α- and β-Effects (change of chemical shift of ortho-protons δ₀^H in NMR¹H spectra) are explained by changes of saturation of definite spatial areas near phenyl ring by methyl groups. It should be stressed that for the investigated compounds 1-17 there are no facts contradicting with the existing of "α-effect" at the branching of alkyl chain near α-carbon atom and "β-effect" observed at the branching near β-carbon atom. The similar regular "structure-property" dependencies are reported for monosubstituted para-alkylaromatic compounds in two our accompanied communications, which we also intend to sent to ECSOC-15.