54098-14-5Relevant academic research and scientific papers
Untersuchungen im Wittig-System nach einem ordnenden Konzept auf der Basis alternativer Prinzipien
Bandmann, Heinz,Bartik, Tamas,Bauckloh, Sylvia,Behler, Ansgar,Brille, Frank,et al.
, p. 193 - 204 (2007/10/02)
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.
Phosphonium-benzylide und Alkali-: Beispiele fuer salzfreie Ylide und korrespondierende Alkalikomplexe
Schmidbaur, Hubert,Deschler, Ulrich,Milewski-Mahrla, Beatrix,Zimmer-Gasser, Beate
, p. 608 - 619 (2007/10/02)
Phosphonium salts R2P(CH2C6H5)2+Br- (with R = CH3, CH2C6H5, or C6H5) were prepared from phosphane precursors with benzyl bromide and converted into the corresponding ylides R2P(CH2C6H5)=CHC6H5 (3a-c).These ylides react with lithiumal
