Synthesis and Stereochemistry of Some New Trispiro-1,3-dioxaneswith Axial and Helical Chirality
摘要:
The stereoisomerism of some trispiro-1,3-dioxanes obtained from substituted cyclohexanones and pentaerithrytol is discussed considering the possible trispiro-6,9-syn-9,12-syn, trispiro-6,9-syn-9,12-anti, and trispiro-6,9-anti-9,12-anti structures of the spiro skeleton and the characteristic axial and helical chirality of spiranes with six-membered rings. The influence of the presence of chiral carbon atoms and of the peculiar conformational behaviour of the molecules on the stereoisomerism of the these compounds is elucidated.