ホルモ-ス合成研究の新展開
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Recent studies concerning the formose reaction which was analyzed by measuring the oxidation-reduction potential (ORP) of the reaction mixture were reviewed. Some appreciable transition points in the ORP curve show satisfactory the occurence of a phase change, such as the induction period, the formose - forming and the suger - decomposing stages. The linear relations between the concentration of the dissolved calcium ion species and the induction period (T <SUB>min</SUB>) and the formose -forming period (T <I><SUB>max</SUB></I> -T<SUB>min</SUB>), namely T<SUB>min</SUB> = a [CaOH<SUP>+</SUP>] +c and T <SUB>max</SUB> - T<SUB>min</SUB> =a [CaOH<SUP>+</SUP>] + b [Ca (OH) <SUB>2</SUB>] +c, were obtained, suggesting that CaOH<SUP>+</SUP> is the principle catalytic species in the induction period, while both CaOH<SUP>+</SUP> and Ca (OH) <SUB>2</SUB> are effective in the formose - forming step. When the major parts of the dissolved calcium ions were removed as sparingly soluble salts or chelate complexes at the end of the induction period (T <SUB>min</SUB>), a selective formose reaction was found to occur giving three kinds of branched sugar alcohols. The effects of other added metal hydroxides on the formose-forming step and the product distributions are also examined.
- 社団法人 有機合成化学協会の論文
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