A Non-Stereospecific Diels–Alder Reaction

✍ Scribed by Prof. Dr. Herbert Meier; Dipl.-Chem. Heinz-Ludwig Eckes; Dr. Hans-Peter Niedermann; Dipl.-Chem. Heinz Kolshorn

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 341 KB
• Volume: 26
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.198710461

✦ Synopsis

in high yields by this reaction1'] and to characterize it by elemental analysis, manganometric titration of the V'", DTA/TG analysis, IR spectroscopy,141 magnetic measurements, and single-crystal X-ray structure analysis.151

The spherical anion [V15036]so (Fig. I), which has the high crystallographic symmetry 6m2(D3,,), is formed by linkage of fifteen tetragonal V 0 5 pyramids. The different

in the expected range. The 15 V atoms are arranged on the surface of a sphere at a distance of 343k 10 pm from the center of the cluster, where the CI' ion resides. Eighteen V-V distances in the range 293 to 300pm indicate spinspin interactions. Owing to significant spin coupling and the delocalized electronic ground state, the 8-electron cluster can only formarly be referred to as a V~V~"v-system161 (pert =3.9pB at room temperature). Probably the electronic interaction of the metal centers is optimized on a spherical surface.