The Azo(Azoxy) Functionality as a ?2 Component in Photo [2+2] cycloadditions ?syn?- and ?anti?-3,4-diazatricyclo[4.2.2.22,5]dodeca-3,7-diene, syntheses, photolyses, X-ray-structure analysis, and PE spectra
作者:Wolfgang Marterer、Horst Prinzbach、Grety Rihs、Jakob Wirz、Jaques Lecoultre、Edgar Heilbronner
DOI:10.1002/hlca.19880710813
日期:1988.12.14
bond to undergo photo [2 + 2] cycloadditions has been further explored. In the specifically designed 1,5-azo/enes 1–3, no [2 + 2] cycloaddition has been observed upon either direct or sensitized excitation with light of various wave lengths at temperatures down to 77 K, in line with expectations based on X-ray (1: d = 2.71 Å, ω = 129°) and PE measurements (1: I1 = 8.00, I2 = 9.05 eV; 2; I1 = 8.00, I2
进一步研究了NN键经历光[2 + 2]环加成反应的倾向。在专门设计的1,5-偶氮/烯1–3中,在低至77 K的温度下用各种波长的光直接或敏化激发时,未观察到[2 + 2]环加成,符合基于X射线(1:d = 2.71Å,ω= 129°)和PE测量(1:I 1 = 8.0 0,I 2 = 9.0 5 eV; 2 ; I 1 = 8.0 0,I 2 = 9.2 5eV)。NN键参与周环反应的空间/立体电子要求显然比CC键更为严格。