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    • 68. 发明授权
    • Process for producing benzyl esters of aromatic hydroxycarboxylic acids
    • 制备芳族羟基羧酸苄基酯的方法
    • US4973737A
    • 1990-11-27
    • US303044
    • 1989-01-30
    • Ryuzo UenoHiroaki TsuchiyaShigeru ItohIchiro Yamamoto
    • Ryuzo UenoHiroaki TsuchiyaShigeru ItohIchiro Yamamoto
    • B01J31/00C07B61/00C07C67/03C07C67/08C07C69/88C07C69/94
    • C07C67/03C07C69/88
    • Highly pure benzyl esters of aromatic hydroxycarboxylic acids are produced in high yields by reacting an aromatic hydroxycarboxylic acid or its lower alkyl ester with a benzyl alcohol in the presence of an organotin compound of the general formula ##STR1## wherein R's are identical or different and each represents an alkyl group having 1 to 8 carbon atoms or an aryl group, and Z represents an oxygen or sulfur atom,an organotin compound of the general formulaR.sub.p SnX.sub.q (II)wherein R is as defined, X represents a halogen atom or the group --OCOR.sup.1 in which R.sup.1 represents a saturated or unsaturated alkyl group having 1 to 18 carbon atoms or an aryl group, p is 2, 3 or 4, q is 0, 1 or 2, the sum of p and q is 4, and when q is 2, the two X's may be linked to each other to form the group --OCO--R.sup.2 --COO-- in which R.sup.2 represents a saturated or unsaturated alkylene group having 1 to 10 carbon atoms or an arylene group,or an organotitanium compound of the general formulaTi(OR).sub.4 (III)wherein R is as defined.
    • 通过使芳族羟基羧酸或其低级烷基酯与苄醇在通式为(I)的有机锡化合物的存在下反应,其中R是相同的或通过芳基羟基羧酸或其低级烷基酯与芳基羟基羧酸的高纯度苄酯 各自表示碳原子数1〜8的烷基或芳基,Z表示氧或硫原子,通式RpSnXq(II)表示的有机锡化合物,其中,R如上所定义,X表示卤素原子或 基团-OCOR1,其中R1表示具有1至18个碳原子的饱和或不饱和烷基或芳基,p为2,3或4,q为0,1或2,p和q之和为4, 当q为2时,两个X可以彼此连接形成基团-OCO-R 2 -COO-,其中R 2表示具有1至10个碳原子的饱和或不饱和亚烷基或亚芳基,或有机钛 通式为Ti(OR)4(III)的化合物,其中R为a 定义。