1988 Fiscal Year Final Research Report Summary
Synthesis of Poly( -ketone) Using New Polymerization Reaction
| Project/Area Number |
62470098
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
高分子合成
|
|---|
| Research Institution | TOHOKU UNIVERSITY |
|---|
Principal Investigator |
KOBAYASHI Shiro Department of Molecular Chemistry and Engineering Faculty of Engineering, Tohoku University, 工学部, 教授 (10026198)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
UYAMA Hiroshi Department of Molecular Chemistry and Engineering Faculty of Engineering, Tohoku, 工学部, 助手 (70203594)
SUH Kyung-Do Department of Molecular Chemistry and Engineering Faculty of Engineering, Tohoku, 工学部, 助手 (80196675)
SHODA Shin-ichiro Department of Molecular Chemistry and Engineering Faculty of Engineering, Tohoku, 工学部, 講師 (10143364)
|
|---|
| Project Period (FY) |
1987 – 1988
|
| Keywords | Poly(beca-ketone) / Isopropoxyacetylene / t-Butoxyacetylene / Transition metal catalyst / Poly(isoproxyacetylene) |
|---|
| Research Abstract |
Poly(beta-ketones) are a class of biologically important polymers having keto groups alternatively in the carbon-carbon main chain. They are called "poly-ketides" or "acetogenins", which are involved as precursor in the biosynthesis of aromatic natural products in plants. The present study deals with synthesis of poly (beta-ketones) having a well-defined structure by a new method of polymerization followed by acid-hydrolysis of the product polymers.
Isopropoxyacetylene is polymerized in the presence of transition metal catalyst such as WCl_6 and MoCl_5 to give brownish materials. The structure of the isolated polymers has been confirmed as poly(isopropoxyacetylene) by NMR and IR spectroscopy. The polymerization of t-butoxyacetylene by WCl_6 catalyst gave polymer containing a small amount of an isomerized unit. The less acidic catalysts, W(OCH_6)_nCl_<6-n> (n=4,5), however, yielded desired polymer almost exclusively. The hydrolysis of poly(t-butoxyacetylene) was carried out in a mixture of hydrochloric acid and dioxane at room temperature. The IR spectrum of the product indicated that poly(t-butoxyacetylene) was easily hydrolyzed to afford the corresponding poly(beta-ketone) efficiently. On the other hand, poly (isopropoxy acetylene) was less reactive toward the acid hydrolysis.
|
