In this work, the catalytic activity of ruthenium II and III complexes containing chloride, pyridine, phosphine and CO ligands was investigated in the hydroformylation - hydrogenation and hydroformylation - acetalization reactions. The complexes mer-tRuCl(3)(dPPb)(H2O)](1), mer-[RuCl3(dPPb)(4-VPy)](2), mer-[RuCl3(dppb)(4-tBupy)](3), mer-[RuCl3(dppb)(py)](4), mer-[RuCl3(dppb)(4-Phpy)](5), mer-[RuCl3(dppb)(4-Mepy)](6), cis-[RuCl2(CO)(2)(dPPb)1(7), trans-[RuCl2(CO)(2)(dPPb)1(8), RuCl3 center dot xH(2)O(9), [RuCl2(PPh3)(3)](10) and [RuCl2(PPh3)(2)(dppb)](11) were used as supplied or synthesized as previously described in the literature {Where PPh3 = triphenylphosphine, dppb = 1,4-bis(diphenylphosphino)butane, py = pyridine, 4-Mepy=4-methylpyridine, 4-Vpy=4-vinylpyridine, 4-tBupy=4-tert-butylpyridine and 4-Phpy=4-phenylpyridine}. These complexes were used as a pre-catalysts in a hydroformylation catalytic system to produce C C, C=O and C-O bonds, where 1-decene resulted in a formation of respective alcohol and dimethyl acetals. Several reactions were performed in order to find the best reaction conditions presenting the best conversion (64% after 24h). The 1-decene was also used as a substrate in two type tandem reactions labeled as: hydroformylation - hydrogenation (HH) and hydroformylation - acetalization (HA) reactions. The relationship between Ru - catalyst/substrate was 1:100, without free ligands or additives, in a controlled temperature and pressure. All the products of catalytic reactions HH and HA were analyzed by CG-FID with good yields. (C) 2016 Elsevier B.V. All rights reserved.