stereoselectivity การใช้

• A model for the observed stereoselectivity can be found below.
• The additional steric bulk improves the stereoselectivity of the reduction.
• This example is somewhat more typical than those shown earlier since the stereoselectivity
• It is necessary to have this chelation effect to achieve high stereoselectivity.
• However, the mechanism of how these additives reverse stereoselectivity is still being debated.
• The quality of stereoselectivity is concerned solely with the products, and their stereochemistry.
• This stereoselectivity is explained in the scheme below.
• It is for this reason that explanations for stereoselectivity remain scarce without some modification.
• Again, the stereoselectivity of the iodolactonization plays an integral role in product formation.
• The stereoselectivity of this reaction was further investigated through study of prochiral methylene hydrogen discrimination.
• Cram s rule explains the stereoselectivity by considering the transition state depicted in figure 3.
• Even in systems without existing stereocenters, Bartlett and coworkers found that stereoselectivity was achievable.
• The addition of the isopropyl group in the chemical synthesis was achieved with complete stereoselectivity.
• Vedejs has put forth a theory to explain the stereoselectivity of stabilized and unstabilized Wittig reactions.
• Importantly, only one diastereomer is produced, with stereoselectivity being introduced in the 3rd reaction.
• This greatly improves stereoselectivity and yield.
• The stereoselectivity of the iodolactonization is very important if the desired vibralactone configuration is to be obtained.
• The quinoline and quinuclidine rings are sterically demanding groups that can induce a high degree of stereoselectivity.
• This reasonable stereoselectivity is clear through visualization of the Felkin-Ahn models of the possible chair forms.
• This reaction may be catalyzed by proline to proceed through chiral enamine intermediates which allow for good stereoselectivity.