The trans diastereoisomers of 2-oxo-4(S)-phenyl-1,3,2-dioxathiolane and meso-2-oxo-4,5-diphenyl-1,3,2-dioxathiolane have been unambiguously identified by X-ray analysis; both adopt the half-chair conformation an differential endocyclic S–O bond lengths provide evidence for a stereoelectronic interaction with the SO group.
X射线明确确定了2-oxo-4(S)-苯基-1,3,2-二氧杂
硫杂
环戊烷和内消旋-2-oxo-4,5
-二苯基-1,3,2-二氧杂
硫杂
环戊烷的反式非对映异构体分析; 两者均采用半椅子构型,不同的环内S-O键长度为与S O基团进行立体电子相互作用提供了证据。