dioxolane ring adopts an envelope conformation. The chiral centre in the dioxolane ring, introduced during the synthesis of the compound, has an R configuration, with the ethoxy group exo to the mannopyranose ring. The asymmetric unit also contains one water molecule with a refined site‐occupancy factor of 0.222 (8), which bridges between molecules A and B via O—H...O hydrogen bonds.
标题化合物,C 16 H ^ 24 ö 10 ·0.11H 2 O,中的合成中的关键中间体2-脱氧-2- [ 18 F]
氟- d -
葡萄糖(18 F-FDG),其是最广泛用于正电子发射断层扫描(PET)的分子成像探头。晶体结构在不对称单元中具有两个独立的分子(A和B),具有非常相似的几何形状。
吡喃糖环采用4 C 1构象[Cremer–Pople折叠参数:对于分子A和Q,Q = 0.553(2)Å,θ= 16.2(2)°,)= 290.4(8)°对于分子B ] = 0.529(2)Å,θ= 15.3(3)°,ϕ = 268.2(9)° ,并且二
氧戊环环具有包络构象。的手性中心在二
氧戊环,化合物的合成过程中引入,具有- [R构型,用乙氧基外到
吡喃
甘露糖环。不对称单元还包含一个
水分子,其位点占位因子为0.222(8),该
水分子通过O-H ... O氢键桥接在分子A和B之间。