Polyglycerol was mixed with 2 equivalents of finely powdered maleic anhydride and heated at 80°C for 3 hours. After disappearance of the IR absorption band of anhydride and appearance of a characteristic band corresponding to ester formed the reaction was Holzforschung / Vol. 55 / 2001 / No. 1 Summary Polyglycerol (PG), an agricultural by-product of diester industry, was reacted with maleic anhydride (MA) to give heat curable compounds which are useful for impregnating wood to improve biological resistance, dimensional stability and strength. The relationships between reaction conditions of polyglycerol/maleic anhydride (PG/MA) adduct treatment and performance of treated solid wood were investigated. Conditions recommended for producing PG/MA treated wood durable for a long time are vacuum/pressure impregnation of aqueous solutions of PG/MA adduct (30 %) in the presence of 2-butanone peroxide (2 %) and cobalt naphthenate (2 %).
ChemInform Abstract Iodocyclization of the title compounds (II) or (V) leads to the (2,3-b)-anellated products (I) or (IV) of a kinetically controlled reaction. On the other hand, when the reaction is carried out in a basic medium, the enolates derived from (II) or (V) are converted to the (3,2-c)-anellated products (III) or (VI).
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