Synthesis, complexation chemistry and a case of self-recognition of chiral phosphite ligands
作者:Albert C Dros、Auke Meetsma、Richard M Kellogg
DOI:10.1016/s0040-4020(99)00067-8
日期:1999.3
borane adducts) it was shown that on use of racemic materials a degree, less than absolute, of self-recognition is involved in the formation of the diphosphite obtained with catechol. No self-recognition is involved in the assembly of the product with resorcinol. Determination of the degree of self-recognition was made difficult by the identity of the NMR spectra of the meso and racemic forms of the diphosphites
(R)-(-)-1-苯基-2,2,3-三甲基丁烷-1,3-二醇与PCl 3的反应得到反式-(S)-2-氯-4,4,5,5-四甲基-6-(R)-苯基-1,3,2-二氧杂膦啉与邻苯二酚,间苯二酚,2,2-二甲基-1,3-丙二醇和氟化二甲醇平滑偶联,形成相应的亚磷酸酯。通过三种不同的方法(氧化为磷酸盐,氘标记的样品进行电喷雾质谱分析以及硼烷加合物的NMR光谱分析)表明,在使用外消旋材料时,形成的自识别程度小于绝对值儿茶酚制得的亚磷酸二氢钠。用间苯二酚组装产品时不涉及自我识别。由于从儿茶酚获得的二亚磷酸酯的内消旋和外消旋形式的NMR光谱的鉴定,使得难以确定自识别程度。