A comparative study of the synthesis of C2-Symmetric chiral 2,2'-biaziridinyls
Two comparative synthetic routes to new enantiomeric C 2 -symmetric Boc-protected biaziridinyls from tartaric ester were studied. Simplicity, high enantiomeric purity and high chemical yield of the target compound characterize the proposed methods. Also, unprotected biaziridinyl was synthesized and fully characterized.
Abstract Solid-state 29Si NMR has been used to determine the principal values of the shielding tensors for organosilicon compounds, including cyclic silanes. Silicon atoms in three-membered rings show exceptionally large chemical shift anisotropies, similar to those of multiply-bonded Si atoms. Possible reasons for these large CSA's are discussed.