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Catalysis of Organic..

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Margitfalvi et al. 307Table 1. Variables and their levels in a simple optimization task.VariablesVariable levelsCatalyst 1, amount, g 0.05 0.10 0.15 0.20 0.25Catalyst 2, amount, g 0.00 0.05 0.10 0.15 0.20Hydrogen pressure, bar 25 50 75 100 125Temperature , o C 80 90 100 115 130Substrate concentration, M 0.08 0.15 0.30 0.60 0.90Stirring rate, rpm LOW HIGHTable 2. Modifiers used in selective hydrogenation or related reactions.Modifier Reaction TypeTransition metals (Pb) Triple bond M – CTransition metal salts Various M - CTransition metal oxides Various S – CQuinoline and analogues Dienes M – PTertiary amines Keto groups M – PNH 3 Reductive amination PTrialkyl and triaryl hydr<strong>of</strong>romylationM – PphosphinesAlkali hydroxides and Nitrile hydrogenation S – CcarbonatesLong chain amides For unsaturated nitriles M-PH 3 PO 3 and H 3 PO 4 Reductive aminationunsaturated compounds<strong>of</strong> M-PSulfur containing Selective hydrogenation M-Ccompounds (CS 2 ,tiophene)Metal acetyl-acetonates Selective hydrogenation M-PMetal alkyls (SnR 2 Cl 2 ,) Nitrile hydrogenation M-CMetal (Sn, Ge) tetraalkyls Unsaturated aldehydes M-CCO Triple bond M-PChiral moieties Prochiral ketones, imines M-C, M-PAlkali and alkali earth Selective hydrogenation <strong>of</strong> M-CmetalsphenolVO x Reductive amination <strong>of</strong> M-PketonesM - modifier for the metal, S - modifier for the support, C - Compositional, P -Process.The above list <strong>of</strong> modifiers unambiguously shows their large diversity. There areexamples indicating that the best results can be achieved by combination <strong>of</strong> severalmodifiers [22]. Consequently, catalyst modification is an excellent field forcombinatorial research provided a library optimization method is available.

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