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2000aldehydes aldehydes (acyclic compounds) P 0170 -070Novel Arsine Ligands for Selective Hydroformylation of Alk-1-enes Employing Platinum/Tin Catalysts.-Wide bite angle arsine based ligands can constitute very efficient catalysts for the selective hydroformylation of terminal alkenes, e.g. (I). The arsine modified platinum/tin systems can compete with the best rhodium catalysts, especially in reactions where very high linear:branched ratios are necessary. -(VAN DER VEEN, LARS A.; KEEVEN, PETER K.; KAMER, PAUL C.