Sodium hydride polymer metalation reaction

Polymer-attached Cp2TiCl2 has been reduced by sodium naphthalide, and the resultant species, which may contain a mixture of Ti(IV), Ti(III), and Ti(II), are more active hydrogenation catalysts for olefins than is the unsupported Cp2TiCl2 (72). Although distinct Ti-H-containing species were not identified, it has been suggested that the complete reaction occurs at one metal center, in contrast to earlier suggestions that such reductions involve a bimolecular reaction of an intermediate titanocene alkyl and a titanocene hydride (30). 

Certain elements (such as arsenic, antimony, mercury, selenium, and tin) can, after producing the soluble digest of the polymer, be converted to gaseous metallic hydrides by reaction of the digest with reagents such as stannous chloride or sodium borohydride ... 

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