A Study of the 13C NMR Shifts in Two Tetradehydrocyclodecabiphenylenes and Related Aryl and Biphenylenylacetylenes
作者:Charles F. Wilcox、Karl A. Weber
DOI:10.1016/s0040-4020(01)82336-x
日期:1985.1
references. Most of the shifts can be assigned unambiguously. The acetylenic shift assignments were verified by ortho-proton, sp-carbon (1H(1)-13Csp(3)) decoupling experiments. A simple additive shift correlation is found for the hydrocarbons containing unstrained acetylenic groups. However, significant discrepencies are found for the 13C shifts for the strained hydrocarbons 1, 2, 1,2-bis(phenylethynyl)-benzene
5,6,9,10-四脱氢环十[1,2,3,4-def]-苯并[7,8]联苯,1和5,6,9,10-四脱氢环十[1,2,3 ]的13 C光谱据报道,1,3,4-def]-萘[2,3-7,8]联苯2是许多用作光谱参考的较简单炔烃的化合物。大部分班次可以明确分配。通过原质子,sp碳(1 H(1)-13 C sp(3))解耦实验验证了炔属转移任务。对于含有未应变的炔基的烃,发现了简单的累加位移相关性。但是,发现紧张的烃1的13 C转变存在显着差异。,2,1,2-双(苯基乙炔基) -苯,12,和2,3-双(苯基乙炔基) -萘,13.数据差异是附近的三键碳原子particularily大和归因于应变的组合,再杂交以及其他与邻位取代炔烃之间相互作用的邻近效应。