苏糖

苏糖（，C4H8O4），又名異赤藻糖，在分类上属于丁糖与醛糖，从費雪投影式的角度看，中间两个碳原子上的羟基在碳骨架的异侧。

赤式和苏式
有机化学的习惯命名法中，使用“苏”或“苏式”（"threo"）表示相邻两碳相同官能团在费歇尔投影式中处于异侧的构型。Formulas Using Other Configurational Notations , W. Rausch, accessed 1 March 2011这种命名源自苏糖的构型。相对的，两个官能团在同侧的为赤式构型（"erythro"）。Prof. Rausch helpfully notes that the prefixes "may be applied to racemic compounds, as well as pure enantiomers and meso compounds", and that when depicted in the common "zig-zag" representation, adjacent "substituents may lie on the same side of the carbon chain... [syn] or on opposite sides... [anti]", which is opposite of their depiction in a Fischer projection.赤式和苏式为差向异构体。


参考文献

Category:醛糖
Category:丁醛糖