Oligomer compounds

K. Ishii, Y. Norisue, K. Hiramatsu, M. Miyamoto, M. Yamazaki, and D. Ohno. Polyphenylene ether oligomer compound, derivatives thereof and use thereof. US Patent 6 835 785, assigned to Mitsubishi Gas Chemical Company, Inc. (Tokyo, JP), December 28, 2004. 

In this way, by variation of the length and the composition of the moiety between the acrylate groups, a large number of a,< diacrylates and dimethacrylates have been obtained. By using branched oligomers, compounds of higher functionality have also been synthesized. 

Because stoichiometric control of the reactant comonomers is so critical towards establishing chain length, well-defined model oligomer compounds can also be readily synthesized [9,23]. 

Step-growth polymers are formed under conditions in which the individual monomers react with each other to form oligomers (compounds constructed from just a few monomers), which are then joined together to form polymers. 

Cycloaddition reactions have also been used to prepare a range of [CpCo(ri -cyclopentadienonesuperphane)] complexes The [CpCo(CO)2]-mediated oligomerisation of ethynylazulenes has been described and shown to result in the preparation of [CpCo(ri -butadiene-like)] complexes as well as other metal-coordinated and free oligomers. Compound 88 has been prepared, which on treatment with Li in THF afforded the cyclobutadiene dianion 89 which essentially fulfils the criteria for aromaticity ... 

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