このエントリーをはてなブックマークに追加
ID 19973
Eprint ID
19973
フルテキストURL
著者
Hagiwara Takayuki 岡山大学
本水 昌二 岡山大学
抄録
The contribution of substituent groups to the extractability of phenols and benzoic acids was examined by using a substituent constant, π, derived from the distribution coefficients of nonionic substances. This constant is defined as π(X)=log K(D(X))-l8o9g K(D(H)), where K(D(X)) is the distribution coefficient of a derivative and log K(D(H)) is that of the parent compound. The substituent constants of the groups at the ortho-position of phenol were found to vary with a variation of the extraction solvent, possibly due to competition between the hydration and solvation of an organic solvent. From the K(D) values of the phenols and benzoic acids determined between chloroform and water, the substituent constants of halogeno, cyano, trifluoromethyl and nitro groups were calculated. In phenols, the π values of the ortho-substituting group (π(o)) were greater than those of the meta- and para-substituting group, π(m) and π(p), respectively, whereas in benzoic acids π(o) are smaller than π(m) and π(p). Such results can be explained by a masking effect and the overlapping effect: the masking effect increases the π(o) values, whereas the overlapping effect decreases the π(o) values. A method for predicting the total π values of di- and tri-substituted phenols and benzoic acids is proposed.
キーワード
Solvent extraction
phenol
benzoic acid
extractability
substituent group contribution
発行日
1991-02-10
出版物タイトル
Analytical Sciences
7巻
1号
出版者
日本分析化学会
出版者(別表記)
Japan Society for Analytical Chemistry
開始ページ
129
終了ページ
135
ISSN
0910-6340
NCID
AA10500785
資料タイプ
学術雑誌論文
オフィシャル URL
http://www.journalarchive.jst.go.jp/english/jnlabstract_en.php?cdjournal=analsci1985&cdvol=7&noissue=1&startpage=129
言語
English
著作権者
日本分析化学会
論文のバージョン
publisher
査読
有り
DOI