摘要在含有锌汞齐的丙酮-水混合物(6:1)中还原无色[LRe VII O 3] Br可获得绿色,对空气敏感的[LRe VO 2 Br],形成紫色络合物[LReO(μ-O) 2 ReOBr 2]在水溶液中(L = 1,4,7-三氮杂环壬烷; C 6 H 15 N 3)。通过类似地还原[LReO 3] ReO 4,得到紫色中性络合物[LReO(μ-O)2 ReO(ReO 4)2]。[LReO 3] +在碱性溶液中(p K a = 10.3 + 0.2,25℃)去质子化,并分离为黄色固体的[(C 6 H 14 N 3)ReO 3]。后者的酰胺rh(VII)化合物在二甲基甲酰胺中与RX(R = CH 3,苄基; X = Cl)反应,得到环状胺N,N',N''-三烷基化的[L' ReO 3] X。单体rh(V)络合物[LReOX 2] X(X = Cl,Br,I)是由[n-丁基4 N] ReOX 4与L在乙腈中的反应获得的。红外线
Relativity as a Synthesis Design Principle: A Comparative Study of [3 + 2] Cycloaddition of Technetium(VII) and Rhenium(VII) Trioxo Complexes with Olefins
The difference in [3 + 2] cycloaddition reactivity between fac-[MO3(tacn)]+ (M = Re, 99Tc; tacn = 1,4,7-triazacyclononane) complexes has been reexamined with a selection of unsaturated substrates including sodium 4-vinylbenzenesulfonate, norbornene, 2-butyne, and 2-methyl-3-butyn-2-ol (2MByOH). None of the substrates was found to react with the Re cation in water at room temperature, whereas the 99Tc