Tetrahedron

Modulating the propeller-like shape of a tripodal C (CH 2 PPh 2) 3 fragment by the size of the substituent at the pivotal carbon atom in macrobicyclic tri-λ 5- …

M Alajarín, C López-Leonardo, J Berná

Index: Alajarin, Mateo; Lopez-Leonardo, Carmen; Berna, Jose Tetrahedron, 2007 , vol. 63, # 21 p. 4450 - 4458

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Citation Number: 8

Abstract

The chiral macrobicyclic tri-λ5-phosphazenes formed by tripod–tripod coupling of tris (3- azidobenzyl) amines and 1, 1, 1-tris [(diphenylphosphino) methyl] methanes present helical topologies as a result of combining two propeller-shaped tripodal fragments with the same sense of twist. The introduction of a series of Rpiv substituents of increasing size at the pivotal carbon of the lower tert-butane fragment Rpiv–C (CH2PPh2) 3 causes a gradual ...