First Detection of a Selenenyl Fluoride ArSe?F by NMR Spectroscopy: The Nature of Ar2Se2/XeF2 and ArSe?SiMe3/XeF2 Reagents
作者:Helmut Poleschner、Konrad Seppelt
DOI:10.1002/chem.200400596
日期:2004.12.17
Arylselenenyl fluorides ArSeF are obtained from diselenides Ar2Se2 or arylselenotrimethylsilanes ArSe-SiMe3, and XeF2. They are detected by low-temperature 19F and 77Se NMR spectroscopy. Substitution in the ortho position of the aromatic ring to provide electronic or steric protection is a requirement for their formation. ArSe--F compounds decompose according to 3 ArSe-F-->[ArSe-SeF2Ar]+ArSe-F-->ArSeF3+Ar2Se2
从二硒化物Ar 2 Se 2或芳基硒代三甲基硅烷ArSe-SiMe 3和XeF 2获得芳基硒烯基氟化物ArSeF。通过低温19F和77Se NMR光谱检测到它们。芳香环的邻位取代以提供电子或空间保护是其形成的要求。ArSe-F化合物根据3 ArSe-F-> [ArSe-SeF2Ar] + ArSe-F-> ArSeF3 + Ar2Se2分解。已经使用MP2,CCSD(T)和B3 LYP方法计算了这种歧化反应的反应能以及硫和碲同系物的反应能。发现它们在序列S中放热越来越大