Synthesis of novel 2,5-diarylselenophenes from selenation of 1,4-diarylbutane-1,4-diones or methanol/arylacetylenes
作者:Guoxiong Hua、John B. Henry、Yang Li、Andrew R. Mount、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1039/b924986a
日期:——
Reaction of 2,4-bis(phenyl)-1,3-diselenadiphosphetane-2,4-diselenide [PhP(Se)(μ-Se)]2 (Woollins’ reagent, WR) with one equivalent of 1,4-diarylbutane-1,4-diones 1a–g in refluxing toluene affords the corresponding 2,5-diarylselenophenes 2a–g in excellent yields (up to 99%). Alternatively, the 2,5-diarylselenophenes (2a and 2b) can be obtained in 70–80% yields from the reaction of arylacetylene with an equivalent of O-methyl Se-hydrogen phenylphosphonodiselenoate; the latter was derived from WR and methanol. The first X-ray structure of 2,5-diarylselenophenes is presented along with characterisation of their redox properties.
2,4-二(苯基)-1,3-二硒代二膦烯-2,4-二硒化物[PhP(Se)(μ-Se)]2(Woollins试剂,WR)与相应的1,4-二芳基丁酮1a-g在回流的甲苯中反应,获得了相应的2,5-二芳基硒茚烯2a-g,产率极佳(高达99%)。此外,2,5-二芳基硒茚烯(2a和2b)也可以通过芳基乙炔与等量的O-甲基硒氢苯基膦酸二硒酯反应获得,产率为70-80%;后者是由WR和甲醇衍生而来的。本文呈现了2,5-二芳基硒茚烯的首次X射线结构,并对其氧化还原性质进行了表征。