Chiral media for asymmetric solvent inductions. (
S,S
)‐( + )‐1,4‐Bis(dimethylamino)‐2,3‐dimethoxybutane from (
R,R
)‐( + )‐diethyl tartrate
intermediate: (R,R)‐( + )‐N,N,N′,N′‐Tetramethyltartaric acid diamide
reactant: 450 mL (7 mol) of liquid, anhydrous, cold (− 78°C) dimethylamine
intermediate: (R,R)‐( + )‐2,3‐Dimethoxy‐N,N,N′,N′‐tetramethylsuccinic acid diamide
product: (S,S)‐( + )‐1,4‐Bis (dimethylamino)‐2,3‐dimethoxybutane (DDB)
reactant: (R,R)‐( + )‐diethyl tartrate
reactant: (R,R)‐( + )‐tartaric acid (Firma Benckiser, D‐Ludwigshafen, or Firma Boehringer, D‐Ingelheim)