Hiroko Kakuda, Takanori Suzuki, Yoshio Takeuchi and Motoo Shiro
X-Ray diffraction analyses of the novel structures of chiral sultams 1–3 reveal that the nitrogen atom in the N-sulfonamido sultam 1 is planar, whereas the N–H bond in the N-unsubstituted sultam 2 and the N–F bond in the N-fluoro sultam 3 are nonplanar on the side of the smaller alkyl substituent, contrary to expectation.