33456-99-4

Upstream product

• 73789-86-3 4-i-propylbenzyl bromide 
• 603-35-0 triphenylphosphine 

Downstream Products

• 92908-97-9 isopropylbenzylidene(triphenyl)phosphorane 
• 1027504-68-2 1-benzyl-4-(4-isopropyl-benzylidene)-piperidine 
• 284047-07-0 (S)-4-[1-(4-Isopropyl-phenyl)-meth-(E)-ylidene]-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester 
• 81826-23-5 5-(4'-isopropylphenyl)-2E,4E-pentadiene 
• 37163-82-9 (E)-1,2-bis(4-isopropylphenyl)ethene 

Relevant academic research and scientific papers

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.