Highly Regioselective Transformation of out/out-equatorial Bis(formylmethano)[60]fullerenes: Construction of Dissymmetric [60]Fullerene-Centered Triads
摘要:
[GRAPHICS]Three kinds of out/out-equatorial bis( formylmethano)[ 60] fullerenes ( 1b-d) were obtained by the tether-directed bifunctionalization of [ 60] fullerene with bis( alpha-formylsulfonium ylide) s. The condensation of aromatic amines with 1b-d proceeded with an unexpectedly high regioselectivity to give one of two possible regioisomers of mono-imines as the main products ( the ratio of the regioisomers, up to 97: 3). By the transformation of the remaining formyl group in the mono-imines thus obtained, the corresponding dissymmetric bis-imines were efficiently synthesized.
Regio- and diastereo-controlled synthesis of bis(formylmethano)[60]fullerenes and their application to the formation of [60]fullerene pearl-necklace polyimines
摘要:
The tether-directed method was firstly applied to the biscyclopropanation of [60]fullerene via the addition-elimination reaction of bis(sulfonium ylide)s to give bis(formylmethano)[60]fullerenes with satisfactory regio- and stereoselectivity. The equatorialbisadduct thus obtained was used for the polycondensation with an aromatic diamine to afford the corresponding pearl-necklace polyimine with satisfactorily high degree of polymerization. (c) 2006 Elsevier Ltd. All rights reserved.
Highly Regioselective Transformation of <i>out</i>/<i>out</i>-<i>e</i><i>quatorial</i> Bis(formylmethano)[60]fullerenes: Construction of Dissymmetric [60]Fullerene-Centered Triads
作者:Hiroshi Ito、Yasuhiro Ishida、Kazuhiko Saigo
DOI:10.1021/jo060110+
日期:2006.6.1
[GRAPHICS]Three kinds of out/out-equatorial bis( formylmethano)[ 60] fullerenes ( 1b-d) were obtained by the tether-directed bifunctionalization of [ 60] fullerene with bis( alpha-formylsulfonium ylide) s. The condensation of aromatic amines with 1b-d proceeded with an unexpectedly high regioselectivity to give one of two possible regioisomers of mono-imines as the main products ( the ratio of the regioisomers, up to 97: 3). By the transformation of the remaining formyl group in the mono-imines thus obtained, the corresponding dissymmetric bis-imines were efficiently synthesized.
Regio- and diastereo-controlled synthesis of bis(formylmethano)[60]fullerenes and their application to the formation of [60]fullerene pearl-necklace polyimines
作者:Hiroshi Ito、Yasuhiro Ishida、Kazuhiko Saigo
DOI:10.1016/j.tetlet.2006.02.148
日期:2006.5
The tether-directed method was firstly applied to the biscyclopropanation of [60]fullerene via the addition-elimination reaction of bis(sulfonium ylide)s to give bis(formylmethano)[60]fullerenes with satisfactory regio- and stereoselectivity. The equatorialbisadduct thus obtained was used for the polycondensation with an aromatic diamine to afford the corresponding pearl-necklace polyimine with satisfactorily high degree of polymerization. (c) 2006 Elsevier Ltd. All rights reserved.