Methyl -3-hexenoate, preparation

R)-Hydroxy-4-pentenoic44,322 (R-94) and 3(R)-hydroxy-3(R)-methyl-4-hexenoic (R-99, R = H)4S acids were obtained from the racemic acids by recrystallization of their quinine salts. Compound R-94 served322 as the substrate for the synthesis of 2-deoxy-L-eri/t/iro-pen-tose as in 94 —> 98. The enantiomeric acid R-99 was employed46 for the preparation of D-everniicose (see 99 — 105). 

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