作者:Shun-ya Onozawa、Toshiyasu Sakakura、Masato Tanaka、Motoo Shiro
DOI:10.1016/0040-4020(96)00101-9
日期:1996.3
Lanthanoid complexes are found to be very active catalysts for the Tishchenko reaction of aldehydes. In the presence of Cp∗2LnCH(SiMe3)2 (Ln = Nd, La), esters are obtained from corresponding monoaldehydes in high yields. This method is applicable to dialdehydes. The reaction of o-phthalaldehyde proceeds intramolecularly to give phthalide quantitatively. Terephthalaldehyde and di(4-formylphenyl) ether
发现镧系元素络合物是醛的Tishchenko反应的非常活泼的催化剂。在Cp * 2 LnCH(SiMe 3)2(Ln = Nd,La)的存在下,可以从相应的单醛中以高收率获得酯。该方法适用于二醛。邻苯二甲醛的反应在分子内进行,定量得到苯二甲酰。将对苯甲醛和二(4-甲酰基苯基)醚干净地转化为聚[对-(羧甲基)亚苯基](II)和聚[对-(羧甲基)(对-苯氧基)亚苯基](III), 分别。另一方面,间苯二甲醛首先聚合,然后将聚合物转化为大环内酯1,5,11-trioxo-2,4; 8,10; 14,16-三苯并-6,12,18-三氧杂环丁烷(Ia)高产。通过X射线分析确定Ia的18元大环结构。La络合物与苯甲醛的化学计量反应表明,在催化过程中烷氧基络合物处于中间状态。