Structures and Chemistry of Methanofullerenes: A Versatile Route intoN-[(Methanofullerene)carbonyl]-Substituted Amino Acids
作者:Lyle Isaacs、Fran�ois Diederich
DOI:10.1002/hlca.19930760705
日期:1993.11.3
higher single-bond character at 6-5 bonds. Reaction of C60 with diazo diester 15 gave the fullerene diester 14 which was hydrolyzed with BBr3 in benzene to the methanofullerenecarboxylic acid 10, a versatile synthon for the preparation of amphiphilic fullerene derivatives. Treatment of 10 with alcohols and amino acid esters under DCC coupling conditions afforded the esters 5 and 17 and the amino-acid
C 60与恶二唑13的反应以32%的产率提供了二甲氧基甲基富勒烯7,为具有闭合的跨环键的6-6环桥联的异构体。文献调查显示,所有6-6环桥联的亚甲基富勒烯均为带有封闭的跨环键(6-6-封闭)的σ-芳香族芳香族化合物,所有6-5环桥联的都是具有开放式跨环键的π-芳香族芳香族(6 -5-打开)。对6-6封闭和6-5-开放结构的偏爱不是由于取代基效应引起的,而是用这些异构体中在C 60中看到的有利键的保守性进行了最好的解释,C 60在6-6键上具有较高的双键特性和更高的单键性状(6-5个键)。C 60与重氮二酯15的反应将得到的富勒烯二酯14与苯中的BBr 3水解为亚甲基富勒烯羧酸10,后者是一种用于制备两亲性富勒烯衍生物的通用合成子。在DCC偶联条件下用醇和氨基酸酯处理10,分别得到酯5和17以及氨基酸衍生物11和12。