FIELD: petrochemical industry. SUBSTANCE: claimed method comprises contacting initial mixture composed of isobutane, preferably butylenes in 1 to 40 ratio at 50 to 160 C, pressures from 1 to 40 atm with heterogeneous acid catalyst the active of which is metal complex or metal oxopolymeric compound of general formula Hk(Me1)l(Me2)mOnXp, wherein K=1-6; l=1-3; m=1-5; n=1-10, p=2-10, dispersed in porous organic or inorganic matrix followed by extractive regeneration of the deactivated catalyst with organic or inorganic solvent. EFFECT: more efficient preparation method. 13 cl, 1 tbl
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