Synthesis and structures of chromium tricarbonyl complexes of benzylic halides and benzylic alcohols †
作者:A. Maria Christofi、Peter J. Garratt、Graeme Hogarth、Jonathan W. Steed
DOI:10.1039/b002142n
日期:——
Chromium tricarbonyl complexes of mono-, bis- and tris-(hydroxymethyl) substituted benzene have been prepared via direct thermolysis of the alcohol and chromium hexacarbonyl in dibutyl ether–THF. Conversion into the corresponding benzyl halide complexes has been carried out using either PBr3, HBr (aq), HBr in glacial acetic acid or BX3 (X = Cl, Br or I). A comparative study showed that PBr3 and BBr3 give similar yields and purity and are superior to HBr. Crystallographic studies have been carried out on three benzyl alcohol complexes [Crη6-C6H4(CH2OH)2-1,4}(CO)3], [Crη6-C6Me4(CH2OH)2-1,4}(CO)3] and [Crη6-C6H3(CH2OH)3-1,3,5}(CO)3] and on two benzyl bromide complexes [Cr(η6-C6H5CH2Br)(CO)3] and [Crη6-C6H4(CH2Br)2-1,4}(CO)3].
已通过在二丁醚-THF中直接热解醇和六羰基铬制备了单、双和三(羟甲基)取代苯的铬三羰基配合物。使用PBr3、HBr(水溶液)、冰乙酸中的HBr或BX3(X = Cl、Br或I)将其转化为相应的苄基卤代配合物。比较研究表明,PBr3和BBr3的产率和纯度相似,优于HBr。对三种苯甲醇配合物[Crη6-C6H4(CH2OH)2-1,4}(CO)3]、[Crη6-C6Me4(CH2OH)2-1,4}(CO)3]和[Crη6-C6H3(CH2OH)3-1,3,5}(CO)3]以及两种苄基溴配合物[Cr(η6-C6H5CH2Br)(CO)3]和[Crη6-C6H4(CH2Br)2-1,4}(CO)3]进行了晶体学研究。