The absolute configurations of (+)-usnic and (+)-isousnic acid. X-ray analyses of the (−)-α-phenylethylamine derivative of (+)-usnic acid and of (−)-pseudoplacodiolic acid, a new dibenzofuran, from the lichen Rhizoplaca chrysoleuca.

Geometry and Conformation of the α-Amino

Geometry and Conformation of the α-Aminoisobutyric Acid Residue in Simple Derivatives and Dipeptides. Four New X-ray Structural Analyses and a Statistical Analysis from Known Crystal Data

✍ Valle, Giovanni ;Crisma, Marco ;Formaggio, Fernando ;Toniolo, Claudio ;Jung, Gün 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 673 KB

The results of X-ray diffraction analyses on two m-aminoisobutyric acid (Aibl derivativcs, methyl u-(acetylamino)isobuknoate (Ac-Aib-OMc. I ) and bcnzyl a-[(beazyloxycarbonyl)arnino]isobutanoate (2-Aib-OBA, 2), and two terminally blocked, Aib-conlining dipcptides, methyl cr-[(acctyl-~-alanyl)nmino]i