The influence of high hydrostatic pressure on magnetic properties of layered copper compounds Cu₂(OH)₃(C_nH_2n+1CO₂) was studied. The temperature dependences of the magnetization under pressure of these compounds for n = 10 and 12 were measured and spin interactions were calculated. As a result, it was established that the temperature of ferromagnetic ordering and intralayer spin interactions in beta - Cu₂(OH)₃(C_nH_2n+1CO₂) are decreased linearly with pressure increasing. The decrease of T_c under pressure is determined by decrease of intralayer spin interactions, which can be realised by variation of interaction angles or due to the competition of interactions of different types in the layer.

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