Substituenteneffekte in den13C-NMR-Spektren von diastereomeren Chalkondihalogeniden, 10. Mitt.: Erste Synthese und Konfigurationsbestimmung vonthreo-Chalkonbromhydrinen
摘要:
The first synthesis of threo chalcone bromohydrins was realized by reaction of trans chalcone epoxides with SnBr4 in molar ratios from 1:1 to 2:1. The compounds were obtained in high yields and isomeric purity. Their configuration was determined as threo by different methods based on C-13-NMR shifts of C-alpha and C-beta atoms.