WebFeb 1, 2000 · Temperature‐dependent selectivity in nucleophilic additions is affected by the solvent. The inversion temperature (marked with arrows in the graph) that appears in the nonlinear Eyring plots of ln (anti/syn ) versus temperature for the addition of butyllithium to an O‐protected α‐hydroxy aldehyde 1 does not depend on nucleophiles (n BuLi ( ), t BuLi … WebNov 6, 2024 · diastereofacial selectivity under both conditions (entries 10-1 1). However, for R -12 , w hen the diol is installed in the 2-position we observed excellent diastereosel …
Very high diastereofacial selectivities in convenient …
WebJul 28, 2024 · The π-diastereofacial selectivity of these additions is also very high, in all but one case with dienophile addition controlled by the steric demands imposed by the aryl substituent in monoadduct 3 (i.e. the 3′ … WebA group of people need to get into the house, and can take either stair case. Most of the time both stair cases are used, but sometimes something happens causing one stair … pop forward knives
A Structure‐Reactivity Relationship of the Tandem …
WebJan 1, 1986 · 1,3-Syn diastereofacial selectivity (>12 : 1) has been achieved in a facile reduction of β-hydroxyketones with DIBAL-H. Tributyltin hydride also has shown 1,3-syn selectivity. ... The diols were obtained in good yields in the reduction with zinc chloride. The 1 yn selectivity on the reaction is acceptable (7-5 : 1) as room temperature reaction ... WebMay 7, 2024 · Ortho regioselectivity and anti diastereofacial selectivity are predicted in complete agreement with the experimental outcomes. The [3+2] cycloaddition (32CA) reaction of benzonitrile oxide to α-methylene cyclopentanone and propionitrile oxide to γ-methyl-α-methylene- WebFeb 1, 2008 · The sterically more demanding FGs ethylsulfonyl, ethoxysulfonyl, and diethoxyphosphonyl induced diastereofacial selectivity in favor of the corresponding syn products, with diethoxyphosphonyl being the most effective. The substrate with FG = PO(OEt)2 delivered, with eight different arenes, the corresponding syn substitution … share record using apex