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Notice: Undefined index: HTTPS in /www/wwwroot/mengmianren.com/wp-content/plugins/dessky-cache/dessky-cache.php on line 43 Wittig反应能在指定位置生成双键;反应物中有双键或三键对Wittig反应均无影响;Wittig试剂具有很强的亲核性;Wittig反应为非原子经济性反应 – 萌面人博客