Cyclic diynes with tetramethyldisilyl groups in the bridges. Syntheses and properties
作者:Gebhard Haberhauer、Rolf Gleiter、Hermann Irngartinger、Thomas Oeser、Frank Rominger
DOI:10.1039/a904409d
日期:——
A series of cyclic diynes (8–15) with tetramethyldisilyl groups as bridging units have been synthesized from α,ω-bis(chloromethyl)diynes and 1,2-dichloro-1,1,2,2-tetramethyldisilane with lithium in the presence of catalytic amounts of biphenyl. X-Ray investigations of single crystals of 8–14 reveal a twisted-chair conformation for 9–11 and 14, and a twisted half-chair conformation for 8 and 12, whereas 13 adopts a twisted-boat conformation in the solid state. The He(I) photoelectron spectra of 8–14 reveal ionization energies between 8.5–10 eV for the ionization processes from the π-orbitals.
在催化剂联苯的作用下,以α,ω-双(氯甲基)二炔和 1,2-二氯-1,1,2,2-四甲基二硅烷为原料,用锂合成了一系列以四甲基二硅基为桥接单元的环状二炔(8-15)。对 8-14 号单晶体的 X 射线研究表明,9-11 号和 14 号单晶体呈扭曲的椅状构象,8 号和 12 号单晶体呈扭曲的半椅状构象,而 13 号单晶体在固态下呈扭曲的舟状构象。8-14 的 He(I)光电子能谱显示,来自 π 轨道的电离过程的电离能在 8.5-10 eV 之间。