73. Structure and Reactivity of Five- and Six-Ring N,N-,N,O-, and O,O-Acetals: A Lesson in Allylic 1,3-Strain (A1,3 Strain)

Article abstract of DOI:10.1002/hlca.19920750326

The X-ray structures of fifteen 1,3-imidazolidine, 1,3-oxazolidine, 1,3-dioxan-4-one, and hydropyrimidine-4(1H)-one derivatives are described (Table 2) and compared with known structures of similar compounds (Figs. 1-20).The differences between structures