92908-97-9Relevant 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.
Synthesis of 5-(4'-Isopropylphenyl)-2E-pentene and 5-(4'-Isopropylphenyl)-2E,4E-pentadiene
Vig, O. P.,Vig, R.,Dua, D. M.,Rani, Veena
, p. 274 - 275 (2007/10/02)
3-(4'-Isopropylphenyl)propanal (IIa) on modified Wittig reaction with ethyl α-(diethylphosphono)acetate gives the conjugated ester, ethyl 5-(4'-isopropylphenyl)-2E-pentenoate (IIIa), which on LAH reduction yields the allylic alcohol (IVa).The mesylate der
