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Table 1 Product yield and molecular weight as a function of metallocene.

From: Ability of Group IVB metallocene polyethers containing dienestrol to arrest the growth of selected cancer cell lines

Metallocene % Yield dn/dc Mw DP
Titanocene 43 -3.5 3.3 × 107 70,000
Zirconocene 42 -1.0 6.7 × 106 14,000
Hafnocene 47 -0.40 2.1 × 105 400
  1. Note. While the solubility in DMSO is too low to permit NMR and LS in DMSO it is sufficient to allow for biological testing employing DMSO stock solution.