Synthesis and Properties of New Stacked Metallocene Polymers

Autor:	Myron Rosenblum, Bruce M. Foxman, Richard D. A. Hudson
Rok vydání:	1999
Předmět:	chemistry.chemical_classification Cyclopentadiene Organic Chemistry chemistry.chemical_element Polymer Catalysis Inorganic Chemistry chemistry.chemical_compound Monomer chemistry Polymer chemistry Copolymer Organic chemistry Lithium Physical and Theoretical Chemistry Metallocene Alkyl
Zdroj:	Organometallics. 18:4098-4106
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om9902939
Popis:	The substituted cyclopentadienes 5a,b are readily prepared in two steps from benzyloxybenzaldehyde and 4-dimethylaminobenzaldehyde by condensation with cyclopentadiene followed by lithium aluminum hydride reduction of the fulvenes 4a,b. Coupling of the zinc salts of 5a,b with 1,8-diiodonaphthalene in the presence of a catalytic amount of CuI gives the cyclopentadienylated iodonaphthalenes 6a,b. This new protocol represents a significant improvement over earlier procedures for the preparation of such compounds. Conversion of 6a,b to the ferrocenes 7a,b, followed by a second cyclopentadienylation step, affords 8a,b or 9a. These serve as monomers for the synthesis of polymers 1d,e and copolymers 1f−h. These materials show increased molecular weights and improved solubility compared with 1b,c and analogues, in which the cyclopentadienyl-ring substituents are alkyl chains.
Databáze:	OpenAIRE
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