Synthesis of (S,S)‐Diisopropyl Tartrate (E)‐Crotylboronate and Its Reaction with Aldehydes: (2R,3R,4R)‐1,2‐Dideoxy‐2‐Ethenyl‐4,5‐O‐(1‐Methylethylidene)‐Xylitol

Abstract Potassium tert ‐butoxide Trans ‐butene Triisopropylborane ( S , S )‐Diisopropyl tartrate (( S , S )‐DIPT) ( S , S )‐Diisopropyl tartrate ( E )‐crotylboronate ( R , R )‐Diisopropyl tartrate ( E )‐crotylboronate ( S , S )‐Diisopropyl tartrate ( Z )‐crotylboronate ( R , R )‐Diisopropyl tartrate ( Z )‐crotylboronate D‐( R )‐glyceraldehyde acetonide ( 3R , 4R , 5R )‐3‐Methyl‐5,6‐O‐isopropylidene‐hex‐1‐ene‐4‐ol ((2R,3R,4R)‐ 1,2‐dideoxy‐2‐ethenyl‐4,5‐O‐(1‐methylethylidene)‐xylitol ( 3S , 4S , 5R )‐3‐Methyl‐5,6‐O‐isopropylidene‐hex‐1‐ene‐4‐ol ( 3S , 4R , 5R )‐3‐Methyl‐5,6‐O‐isopropylidene‐hex‐1‐ene‐4‐ol