Radiation-induced C—C bond cleavage in 1,2-diarylethanes as model compounds of coal. Part 2.—Pulse and steady-state radiolysis of 1,2-di(pyren-1-yl)ethane in tetrahydrofuran, dimethoxyethane and toluene in the presence of sodium dihydridobis(2-methoxyethoxy)aluminate
作者:Sonja Solar、Nikola Getoff、Matthias W. Haenel、Udo-Burckhard Richter
DOI:10.1039/ft9938900891
日期:——
to study the C—C bond cleavage of the ethano linkage in the radiolysis of solutions containing NaAlH2(OCH2CH2OCH3)2[NaAlH2(OR)2]. Transient species were investigated by pulse radiolysis of solutions of 1,2-DPE, 1-methylpyrene (1-MP) and pyrene (P) in THF, DME and toluene in the absence and the presence of NaAlH2(OR)2. In the presence of the latter stabilized and long-lived radical anion/sodium cation
1,2-二(吡喃-1-基)乙烷(1,2-DPE)已被用作煤的模型,以研究含NaAlH 2(OCH 2 CH 2 OCH 3)2 [NaAlH 2(OR)2 ]。在不存在和存在NaAlH 2(OR)2的情况下,通过脉冲辐射分解THF,DME和甲苯中的1,2-DPE,1-甲基py(1-MP)和pyr(P)溶液,研究了瞬态物质。在后者的存在下,即使在非极性溶剂甲苯中,也生成了1,2-DPE的稳定且长寿命的自由基阴离子/钠阳离子对,生成了1-MP和P。对于醚溶剂(THF或DME)和在甲苯中的溶液,反应机理有很大不同。对于醚类溶剂(SH),NaAlH 2(OR)2充当清除剂,用于通过离子化生成的溶剂自由基阳离子SH˙+和溶剂阳离子SH(H +)。产生稳定的钠阳离子/电子对(Na +,e – s),将芳族底物还原成其自由基阴离子/钠阳离子对。在甲苯中溶液的热解中产生的主要物质是溶剂和底物的电子激发分子