6-A3(R)-3-Hydroxybuttersauremethylester aus Poly-[(R)- 3-hydroxybuttersaure oO CICH,CH,CI/CH,OHOH O H H2SO4 OMe O OH O OH Meoh (PH 2 Me Me -H2O OH O OMe 6-A4 2-Methy l-2, 5-decandiol aus y-Pentyl-y-butyrolacton nCsH1 MeMel OH 6-A46-A3 (R)-3-Hydroxybuttersäuremethylester aus Poly-[(R)- 3-hydroxybuttersäure] ClCH2CH2Cl / CH3OH H2 SO4 O O H OH n OMe OH O 6-A3 O OH H OH n MeOH O OH H OH OH n Me ~H O OH H OH2 O n Me O OMe OH O O H OH n-1 - -H2O 6-A4 2-Methyl-2,5-decandiol aus -Pentyl- -butyrolacton O nC5H11 O HO OH nC5H11 MeMgI 6-A4