13C NMR as a general tool for the assignment of absolute configuration
作者:Iria Louzao、José Manuel Seco、Emilio Quiñoá、Ricardo Riguera
DOI:10.1039/c0cc02774j
日期:——
(13)C NMR, alone or in combination with (1)H NMR, allows the assignment of the absolute configuration of chiral alcohols, amines, carboxylic acids, thiols, cyanohydrins, sec,sec-diols and sec,sec-aminoalcohols, derivatized with appropriate chiral auxiliaries. This extends the assignment possibilities of NMR to fully deuterated and to nonproton containing compounds.
Absolute Configuration of Ketone Cyanohydrins by <sup>1</sup>H NMR: The Special Case of Polar Substituted Tertiary Alcohols
作者:Iria Louzao、Rosa García、José Manuel Seco、Ricardo Riguera
DOI:10.1021/ol8023314
日期:2009.1.1
The absolute configuration of ketone cyanohydrins can be assigned from analysis of the 1H NMR spectra of the corresponding (R)- and (S)-MPA ester derivatives and use of ΔδRS signs. This is an application of the NMR methodology for stereochemical assignment to tertiary alcohols possessing polar groups as substituents.
酮氰醇的绝对构型可以从分析被分配1个相应的(的1 H NMR谱- [R和( - )小号)-MPA酯衍生物和使用Δδ RS迹象。这是NMR方法在立体化学上分配给具有极性基团作为取代基的叔醇的应用。
The Use of a Single Derivative in the Configurational Assignment of Ketone Cyanohydrins
作者:Iria Louzao、José M. Seco、Emilio Quiñoá、Ricardo Riguera
DOI:10.1002/ejoc.201001107
日期:2010.12
The absolute stereochemistry of ketone cyanohydrins can be easily determined by preparing a single MPA derivative. The comparison of two NMR spectra at different temperatures allows the assignment by just paying attention to the evolution of the cyanohydrin chemical shifts. The special case of α-aryl-substituted cyanohydrins is also described.