63512-35-6

Upstream product

• 123-38-6 propionaldehyde 
• 1754-88-7 ethylenetriphenylphosphorane 

Downstream Products

• 92017-16-8 4-acetoxy-2,6-diethyl-5-methyl-[1,3]dioxane 
• 615-30-5 3-hydroxyl-2-methylpentanal 
• 149-31-5 2-methyl-1,3-pentanediol 
• 123-38-6 propionaldehyde 

Relevant academic research and scientific papers

Kinetic Treatments for Catalyst Activation and Deactivation Processes based on Variable Time Normalization Analysis

Progress reaction profiles are affected by both catalyst activation and deactivation processes occurring alongside the main reaction. These processes complicate the kinetic analysis of reactions, often directing researchers toward incorrect conclusions. We report the application of two kinetic treatments, based on variable time normalization analysis, to reactions involving catalyst activation and deactivation processes. The first kinetic treatment allows the removal of induction periods or the effect of rate perturbations associated with catalyst deactivation from kinetic profiles when the quantity of active catalyst can be measured. The second treatment allows the estimation of the activation or deactivation profile of the catalyst when the order of the reactants for the main reaction is known. Both treatments facilitate kinetic analysis of reactions suffering catalyst activation or deactivation processes.

Untersuchungen im Wittig-System nach einem ordnenden Konzept auf der Basis alternativer Prinzipien

Our results show that the stereoselectivity of the Wittig-reaction can be controlled by the variation of substituents in accord with the ORDERING CONCEPT OF ALTERNATIV PRINCIPLES (individual pairs, known and unknown classes of alternatives).The "all-phenyl Wittig-system" having three phenyl groups on phosphorous two in ylid- and aldehyd-position was chosen as a standard for our investigations.Differentiation in ylid-position and compensation on phosphorous and aldehyd-position were observed by the comparison of "patterns".Consequently, most of the selectivity rules of Wittig-reactions can be explained by the differentiation through alternatives in the ylid-position.Inversion or conservation of the "patterns" of measured data points to the variation in structure of starting materials, reaction rates and selectivities.Amount-controls were also described in certain systems.