Metal Ion Induced Rearrangements

2,2′-Bi-1,3-thiazolidine

“…The condensation of glyoxal with -amino--thiols results in the formation of 2,2 0 -bisthiazolidine (Jadamus et al, 1964). Thiazolidines, compounds containing N and S in a fivemembered ring, are of great interest because of the presence of this ring in the important antibiotic penicillin (Fife et al, 1991).…”

“…Thiazolidines, compounds containing N and S in a fivemembered ring, are of great interest because of the presence of this ring in the important antibiotic penicillin (Fife et al, 1991). These types of derivatives have been used for the preparation of nickel(II) chelates (Jadamus et al, 1964), and N,N 0 -methylene-bisthiazolidine analogues are also potentially useful as chiral auxiliaries and ligands for asymmetric synthesis (Díaz et al, 2001). These types of derivatives have been used for the preparation of nickel(II) chelates (Jadamus et al, 1964), and N,N 0 -methylene-bisthiazolidine analogues are also potentially useful as chiral auxiliaries and ligands for asymmetric synthesis (Díaz et al, 2001).…”

“…In addition, there are few X-ray diffraction studies for sulfur-nitrogen-containing ligands. These types of derivatives have been used for the preparation of nickel(II) chelates (Jadamus et al, 1964), and N,N 0 -methylene-bisthiazolidine analogues are also potentially useful as chiral auxiliaries and ligands for asymmetric synthesis (Díaz et al, 2001). Against this background, we present here the crystal structure of the title compound, (I).…”

“…I) was prepared from glyoxal and -amino--thiol (m.p.438-440 K; literature value 452-454 K;Jadamus et al, 1964). Crystals suitable for X-ray crystallography were grown from chloroform at room temperature by slowevaporation.…”

Formation of New Tetradentate Schiff Base Metal Chelates

“…Evidence (1)(2)(3)(4)(5)(6)(7)(8)(9) has accumulated in recent \ , years to show that metal ions change the nature of the condensation product of a-diketones with either o-hydroxy, or o-mercaptoamines and Pmercaptoethylamine. In the absence C£ metal ions, the condensation product is usually heterocyclic 1 where L is oxygen or sulfur.…”