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The crystal structures of chenodeoxycholic acid (CDCA), ursodeoxycholic acid (7β isomer of CDCA) and their other two epimers (3β,7α- and 3β,7β-isomers) have been resolved. The four isomers were recrystallized from p-xylene. CDCA crystal is hexagonal P6 5 while the crystals of the other three isomers are orthorhombic (P2 1 2 1 2 1 space group). Only the 3β,7β isomer...
Thallium(I) bis(mercaptoimidazolyl)borates Tl(Bm R ) (R=Me, Bz, Bu t , p-Tol) have been conveniently obtained in a one-pot reaction by metathesis of thallium(I) acetate and the corresponding sodium derivatives Na(Bm R ), in turn generated in high yield from NaBH 4 and the appropriate 2-mercapto-1-alkylimidazoles. In contrast to polymeric Tl(Bm Me ), the...
The paramagnetic nickel(II) complexes [(dppe)Ni(L)]X (L=Bm R or Tm R ) have been readily prepared from the appropriate 1,2-bis(diphenylphosphino)ethane adducts Ni(dppe)X 2 (X=Cl, Br) and the thallium(I) reagents Tl(Bm R ) (R=Me, Bu t ) or Tl(Tm R ) (R=Me, Bu t , p-Tol), and isolated as carmine to deep purple solids in 75-95% yield. X-ray diffraction...
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