Synthesis of novel crown derivatives incorporating a diaminophosphine group in a polyether macrocycle
作者:Jean Pierre Dutasta、Pascal Simon
DOI:10.1016/s0040-4039(00)95540-0
日期:1987.1
DUTASTA, JEAN PIERRE;SIMON, PASCAL, TETRAHEDRON LETT., 28,(1987) N 31, 3577-3580
作者:DUTASTA, JEAN PIERRE、SIMON, PASCAL
DOI:——
日期:——
Synthesis and molecular structure of new phosphorous-crown compounds containing the thiophosphoryl group
作者:Jean-Paul Declercq、Pascale Delangle、Jean-Pierre Dutasta、Luc Van Oostenryck、Pascal Simon、Bernard Tinant
DOI:10.1039/p29960002471
日期:——
The synthesis and characterization of four phosphorus macrocycles (1–4) are reported. The X-ray crystal structures of compounds 1–4 and solvate 1·H2O show the molecules in asymmetric conformations with at least one methyl group of the phenoxy substituents oriented toward the centre of the macrocyclic cavity. Variable-temperature 1H NMR experiments show that in solution the molecules exist mainly as rapidly interconverting conformers. In the 18-membered ring 1, the dynamic process results in the enantiomerization of asymmetric conformers with a barrier of 8 kcal mol–1.‡ The 21-membered ring 3 is more flexible and exists in several conformations.