Methanetriacetic and methylmethanetriacetic acids, their precursors and derivatives: NMR and X-ray diffraction studies

The NMR spectra and crystal structures of triacid 2b, triamide 4b and diastereomers 7, 8 were studied; the crystal structure of 2b is the first example of an H-bonded totally interlocked and percatenated homochiral structure.