Flexible cis- or trans- chelating biphosphine ligands derived from - or - trehalose
作者:John M. Brown、Stephen J. Cook、Alexander G. Kent
DOI:10.1016/s0040-4020(01)88062-5
日期:1986.1
The ligands 2,3,4.-tri-O-methyl-6-(diphenyl phosphino)-α-D-glucopyranosyl- 2', 3',4'-tri-O-niethyl-6 '-(diphenyl phosphino)-α-D-glucopyranoside (αα-TREDIP) and the anomer ββ-TREDIP have been prepared from dimesylate precursors. They form a range of rhodium complexes in which the phosphines can be mutually cis or trans, depending on the other ligands present. The αα-anomer shows more propensity for trans-complexation
配体2,3,4.-三-O-甲基-6-(二苯基膦基)-α-D-吡喃葡萄糖基-2',3',4'-三-O-乙基-6'-(二苯基膦基) -α-D-吡喃葡萄糖苷(αα-TREDIP)和异构体ββ-TREDIP是由二甲磺酸酯前体制备的。它们形成一定范围的铑配合物,其中膦可相互存在顺式或反式,这取决于存在的其他配体。α-端基异构体比β-端基异构体显示出更高的络合倾向,这可以从构象上进行解释。