The reactivity of 3,5-dimethylidene-2,2,6,6-tetramethyl-4-oxopiperidin-1-oxyl and its diamagneticN-methyl analog in nucleophilic addition of amines and diels—Alder dimerization

X-ray crystal structures of 1,2,4-tri-O-

X-ray crystal structures of 1,2,4-tri-O-acetyl-5-deoxy-3-O-methyl-5-[(S)-phenylphosphinyl]-α-d-xylopyranose and its 5-[(S-phenylphosphinothioyl] derivative, and conformations of d-xylopyranose analogs having a C6H5P(R) group in the hemiacetal ring

✍ Thomas Richter; Peter Luger; Tadashi Hanaya; Hiroshi Yamamoto 📂 Article 📅 1991 🏛 Elsevier Science 🌐 English ⚖ 780 KB

X-ray crystallographic analyses are reported for the two title compounds (8 and 9), of which the former crystallized in two modifications (8n and 8b). In all three structures, the pyranose rings have the %, (D) conformation and the substituents at C-l are axial and those at C-24-4 are equatorial. Th