Chiral atropisomeric five-membered biheteroaromatic diphosphines: New ligands of the bibenzimidazole and biindole series
摘要:
Two new chiral atropisomeric biheteroaromatic diphosphines are described: 2,2'-bis(diphenylphosphino)-1,1'-bibenzimidazole (3a) and 3,3'-dimethyl-1,1'-bis(diphenylphosphino)-2,2'-biindole (4a) structural characterization is given and configurational stability at room temperature demonstrated. The oxidation potential was recognized as a good tool to evaluate the electronic availability of the phosphorus atom in the series of biheteroaromatic diphosphines. Its value increases parallel to the electronic demand of the heterocyclic system and also depends on the position of the diphenylphosphino group. (C) 1997 Elsevier Science S.A.
Chiral atropisomeric five-membered biheteroaromatic diphosphines: New ligands of the bibenzimidazole and biindole series
摘要:
Two new chiral atropisomeric biheteroaromatic diphosphines are described: 2,2'-bis(diphenylphosphino)-1,1'-bibenzimidazole (3a) and 3,3'-dimethyl-1,1'-bis(diphenylphosphino)-2,2'-biindole (4a) structural characterization is given and configurational stability at room temperature demonstrated. The oxidation potential was recognized as a good tool to evaluate the electronic availability of the phosphorus atom in the series of biheteroaromatic diphosphines. Its value increases parallel to the electronic demand of the heterocyclic system and also depends on the position of the diphenylphosphino group. (C) 1997 Elsevier Science S.A.
Synthesis of 2-methylindole analogues and skatole dimers under friedel-crafts reaction conditions
作者:Shashi B. Mahato、Nirup B. Mandal、Sukanya Chattopadhyay、Peter Luger、Manuela Weber
DOI:10.1016/0040-4020(95)00824-r
日期:1995.11
A one pot synthesis of 2-methy lindole analogues and skatole dimers of biological interest using excess amounts of the substrates and the catalyst and higher temperature underFriedel-Crafts acylation conditions is reported. The products were defined by spectroscopic and single crystal X-ray analysis. Rationalization for the formation of the products has also been attempted.
Two new chiral atropisomeric biheteroaromatic diphosphines are described: 2,2'-bis(diphenylphosphino)-1,1'-bibenzimidazole (3a) and 3,3'-dimethyl-1,1'-bis(diphenylphosphino)-2,2'-biindole (4a) structural characterization is given and configurational stability at room temperature demonstrated. The oxidation potential was recognized as a good tool to evaluate the electronic availability of the phosphorus atom in the series of biheteroaromatic diphosphines. Its value increases parallel to the electronic demand of the heterocyclic system and also depends on the position of the diphenylphosphino group. (C) 1997 Elsevier Science S.A.