Hafnocene complexes synthesis

Fluorenyl- /-fluorenyl complexes, with Ti(IV), 4, 406 Fluorenyl hafnocene dichlorides, synthesis, 4, 943 Fluorenyl zirconocene dichlorides, synthesis, 4, 943 Fluorescence resonance energy transfer, in high-throughput catalyst discovery, 1, 358 Fluorescent sensors, Pt acetylenes as, 12, 472... 

Kaminsky, W. Hopf, A. Piel, C. Q-symmetiic hafnocene complexes for synthesis of syndiotactic polypropene. J. Orgaromet. Chem. 2003, 684, 200-205. 

Jany, G Fawzi, R. Steimann, M. Rieger, B. Synthesis of enantiomerically pure ethylene-bridged ansa-zirconocene and -hafnocene complexes bearing fluorenyl, indenyl, octahydroflnorenyl, and tetrahydroindenyl ligands. Organometallics 1997,16,544-550. 

So far, the only examples of O-C migrations have applied to pyranose sugars or derivatives thereof. However, it should be noted that such reactions are applicable to furanose sugars. One particular example, reported by Matsumoto, et al.,101 was used in the total synthesis of gilvocarcin M. The specific reaction, shown in Scheme 2.4.25, utilized the acetoxy activated furanoside shown. Treating this compound with the phenol and using the hafnocene dichloride-silver perchlorate complex as the Lewis acid, the desired C-arylglycoside was obtained in 87% yield with the a anomer favored in a ratio of 8 1. 

Fischer R, Zimgast M, Flock M, Baumgartner J, Marschno- C (2005) Synthesis of a hafnocene disilene complex. J Am Chem Soc 127 70... 

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