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Lewis acid
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【化】 路易斯酸
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详细解释：
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以下为句子列表：
英文: Acetylation between alcohol and benzoyl oxide was carried out using ZnBr2 as a Lewis acid catalyst in solvent-free condition. Some structures were characterized by NMR and IR.
中文: 以溴化锌为催化剂，在无溶剂条件下实现了醇与苯甲酸酐的酰化反应，部分产物经NMR和IR表征。
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英文: They were used as efficient Lewis acid catalysts for esterification reactions of carboxylic acids with alcohols to afford corresponding saturated esters with 87%~98% yields and unsaturated and tertiary ones with 90%~94% and 54%~68% yields, respectively.
中文: 结果表明，该有机锡化合物是合成酯的优良催化剂，产品收率高，饱和一元羧酸酯的收率为87%~98%，对不饱和羧酸酯和空间位阻大的叔醇酯也能得到较满意的收率，分别为90%~94%和54%~68%。
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