Incorporating Ester Functionality within a Solid-State [2 + 2] Cycloaddition Reaction Based Upon Halogen Bonding Interactions
作者:Samantha J. Kruse、Eric Bosch、Fayeshun Brown、Ryan H. Groeneman
DOI:10.1021/acs.cgd.9b01624
日期:2020.3.4
(C6I2Cl4) as a halogen bond donor along with a series of isomeric pyridine vinyl esters, namely, (E)-methyl-3-(pyridine-X-yl)prop-2-enoate (where X = 4, 3, and 2) (4-PAMe), (3-PAMe), and (2-PAMe), has been achieved. In all cases, C6I2Cl4 halogen bonds to a combination of pyridine nitrogen atoms as well as ester oxygen atoms to yield an extended solid. The cocrystals (C6I2Cl4)·(4-PAMe) and (C6I2Cl4)·2(3-PAMe)
基于1,4-二碘过氯苯(C 6 I 2 Cl 4)作为卤素键供体的共晶体与一系列异构的吡啶乙烯基酯,即(E)-甲基-3-(吡啶-X-基)的形成)-2-丙酸酯(X = 4、3和2)(4-PAMe),(3-PAMe)和(2-PAMe)已实现。在所有情况下,C 6 I 2 Cl 4卤素键与吡啶氮原子以及酯氧原子的组合键产生扩展的固体。共晶体(C 6 I 2 Cl 4)·(4-PAMe)和(C 6 I 2 Cl 4)·2(3-PAMe)具有光反应性。X射线结构分析表明,C 6 I 2 Cl 4分子以均匀的面对面π-π方向堆叠,然后将一对碳-碳双键(C═C)置于与进行固态[2 + 2]环加成反应。因此,在暴露于紫外线下,(C 6 I 2 Cl 4)·(4-PAMe)和(C 6 I 2 Cl 4)·2(3-PAMe)都会进行区域选择性和定量光反应,从而产生头头型光产物,即(rctt)-二甲基-3,4-双(吡啶-4-基)环丁烷-1