(1,2 di-0-acetyl-glycero-3-phosphoryl)choline in optically active or racemic mixture form by treatment with water absorbs a molecule of water and is easily crystallized by medium-polarity organic solvents. The hydrated form of the aforesaid compounds is in the form of a white, crystalline, ...
reacting said 4,4'-dimethoxy-5,6,5',6'-di(methylenedioxy) biphenyl-2,2'-dicarboxylic acid with a chiral α-alkylbenzyl alcohol to obtain a mixture of ester products; separating said mixture into (S)(2R,2'R)di(α-alkyl)benzyloxycarbonyl-4,4'-dimethoxy-5,6,5',6'-di( methylenedioxy...
4 In contrast, the polymer derived fromrac-lactide, a 1:1 mixture ofDand L-lactide, yields amorphous polymers with glass transitions near room temperature. AlthoughL-lactide can be prepared with relatively high enantiopurity from corn fermentation, the requirement for an enantiopure monomer places ...
efforts since the 1960s, the chemical synthesis of P3HB with isotacticityPm(defined as the probability ofmesolinkages between monomer units) >0.85 from the ROP ofrac-β-BL has proven elusive. For example, the ROP ofrac-β-BL by alkyl aluminoxanes produced a mixture of iso-enriched P3HB p...
The racemic lactic acid was then converted into the mixture of lactide isomers, followed by purification process to afford racemic lactide (rac-LA). Purity of the obtained rac-LA was more than 99%. It demonstrates that glycerol can be a good feedstock of rac-LA for the first time....
The diene can be reduced with NaBH4 under basic conditions to give a mixture of C-meso Me6[18]aneN4 (melting point (m.p.) 119–120 °C) and C-racemic Me6[18]aneN4 (m.p. 79 °C) which can be separated by fractional crystallisation from xylene (Me6[18]aneN4=2,4,4,11,13, ...
Compound (RS) has shown different XRD pattern from that of enantiomerically pure (R/R), indicating a preferential formation of a 1:1 mixture of (/) and (/) or rather a racemate compound of (/-) ammonium carbamate salt ( (RS)) from racemate. For thermal stability, the compounds have...
Compound 2 (rac RS) has shown different XRD pattern from that of enantiomerically pure 1 (R/R), indicating a preferential formation of a 1:1 mixture of (R/S-) and (S/R-) or rather a racemate compound of (RS/SR-) ammonium carbamate salt (2 (rac RS)) from racemate. For thermal...
The vessel was allowed to cool down to room temperature, and the yellowish mixture was transferred into an Erlenmeyer flask. The mixture was stirred vigorously and a solution of sodium carbonate (60 g, 0.57 mol) in water (350 mL) was slowly added. The mixture was stirred for an additional...
The racemic lactic acid was then converted into the mixture of lactide isomers, followed by purification process to afford racemic lactide (rac-LA). Purity of the obtained rac-LA was more than 99%. It demonstrates that glycerol can be a good feedstock of rac-LA for the first time....