References
- Aime , S. , Botta , M. , Fasano , M. and Terreno , E. 1997 . Chem. Soc. Rev. , 26 : 1 For a recent review on lanthanide(III) chelates for NMR biomedical applications, see:
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- Current catalogue prices range from US 0.03–0.04/g for technical grade (60–70%), to US2–4/g for 97% triethylenetetramine.
- Fuchs , B. and Ellencweig , A. 1979 . Rec. Trav. Chim. Pays-Bas , 98 : 326
- Argese , M. , Ripa , G. , Scala , A. and Valle , V. Int. Pat. Appl. . WO97/49691-A1 . (Bracco S.p.A.) This procedure was claimed in two independent patents; b) Sandnes, R.W.; Vasilevskis, J.; Undheim, K. and Gacek, M. (Nycomed), Int. Pat. Appl., WO96/28432-A1] without any experimental procedure.
- Various attempts to isolate occasionally occurring yellow impurities were unsuccessful, due to the very tiny amount present in the product. However, the different colour of various batches of 5 influenced neither the product characteristics (m.p., spectra) nor the yields of the subsequent steps.
- Mueller , R. , Philipsborn , W. , Schleifer , L. , Aped , P. and Fuchs , B. 1991 . Tetrahedron , 47 : 1013
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