Highly Efficient Retro-cycloaddition Reaction of Isoxazolino[4,5:1,2][60]- and -[70]fullerenes
作者:Nazario Martín、Margarita Altable、Salvatore Filippone、Angel Martín-Domenech、Roberto Martínez-Álvarez、Margarita Suarez、Marta E. Plonska-Brzezinska、Olena Lukoyanova、Luis Echegoyen
DOI:10.1021/jo070161m
日期:2007.5.1
2][60]- and -[70]fullerenes undergo an efficient retro-cycloaddition reaction to pristine fullerene by thermal treatment in the presence of an excess of a dienophile and Cu(II) catalysis, which can be selectively used in the presence of malonate or pyrrolidine cycloadducts. Trapping experiments using N-phenylmaleimide as dipolarophile have shown that the reaction mechanism occurs by thermal removal of the
异恶唑啉代[4,5:1,2] [60]-和-[70]富勒烯在过量的亲二烯体和Cu(II)催化下,通过热处理进行有效的逆向加成反应,生成原始的富勒烯。可以在丙二酸酯或吡咯烷环加合物的存在下选择性使用。使用N-苯基马来酰亚胺作为亲二氟体的诱捕实验表明,反应机理是通过热去除腈(1,3-偶极)而发生的,在此过程中,Cu(II)作为催化剂的存在是有利的。ESI-MS研究支持观察到的C 60和C 70的逆环加成过程衍生品。与之前在全吡咯烷中观察到的电化学逆环加成过程相反,异恶唑啉基富勒烯在氧化条件下是稳定的。