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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 7, Number 5
May 20, 1986 

Ring-Opening Polymerization of Substituted 3,4-dihydro-2H-pyrans. Syntheses of Alternating Vinyl Copolymers of Dimethyl Dicyanofumarate and Electron-Rich Olefins
Ju-Yeon Lee*, Iwhan Cho
Substituted 3,4-dihydro-2H-pyrans (1a-e) were prepared by (4 + 2) cycloaddition reaction of dimethyl dicyanofumarate with the corresponding electron-rich olefins. The compounds 1a-e were ring-open polymerized by cationic initiators to obtain polymers of 1:1 alternating sequence. Polymerizations were carried out with boron trifluoride etherate in methylene chloride at -78℃. All the polymers obtained were soluble in common solvents and were reprecipitated by pouring its chloroform solution into diethyl ether. All the compounds 1a-e were not as reactive as the corresponding pyrans derived from α -cyanoacrylate.
372 - 376
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