potential chirality of ortho‐phenylenebisguanidines (BGs) with substituents at C(3) and C(6). Guanidinylation of 3,6‐disubstituted benzene‐1,2‐diamines with 2‐chloro‐4,5‐dihydro‐1,3‐dimethyl‐1H‐imidazolium chloride gave the corresponding BGs. X‐Ray crystallography showed that the two guanidine moieties occupy different faces of the benzene ring, creating potential chirality, although optical resolution of
donors and redox-active ligands. The diversity of GFA chemistry results from reaction sequences that are triggered by their oxidation. This work reports on reactions of a new GFA compound, namely, 1,2,4,5-tetrakis(N,N′-dicyclohexylguanidino)benzene, with transition metals, and analyzes the interplay between GFA oxidation, coordination, and hydrogen-bond formation up to deprotonation. The reaction of the
Mono‐ and Dinuclear Ni
<sup>II</sup>
and Co
<sup>II</sup>
Complexes that Feature Chelating Guanidine Ligands: Structural Characteristics and Molecular Magnetism
Several new mono- and dinuclearcomplexes of CoII and NiII with chelatingguanidineligands were synthesized. The molecular structures for most of the complexes in the crystalline state were derived from single-crystal X-ray diffraction, and some characteristicstructural details are discussed. The molecularmagnetism was further studied by superconducting quantum interference device (SQUID) measurements
合成了几种新的带有螯合胍配体的 Co II 和 Ni II 的单核和双核配合物。大多数处于结晶状态的配合物的分子结构来自单晶 X 射线衍射,并讨论了一些特征结构细节。通过超导量子干涉装置 (SQUID) 测量进一步研究了分子磁性。除了实验之外,还进行了量子化学计算。最后,讨论了其中一种配合物的顺磁 NMR 谱,这表明 1 JC,H 相关实验是可能的。
Desymmetrization of Dicationic Diboranes by Isomerization Catalyzed by a Nucleophile
chemistry. By constrast, only a few cationic diboranes are known, that all are symmetrically substituted. In this work, the first unsymmetrically substituted dicationic diboranes, featuring sp2 -sp2 -hybridized boron atoms, are reported. The compounds are formed by intramolecular rearrangement from preceding isomeric symmetrically substituted dicationic diboranes, a process that is catalyzed by nucleophiles
In this work we report on the synthesis of newzinc, magnesium and cationicaluminiumalkyl as well as Mg aryl complexesfeaturingchelatingbisguanidineligands [2,8-bis(tetramethylguanidino)naphthalene (btmgn) and 1,2-bis(tetramethylguanidino)benzene (btmgb)]. The bond properties in the complexes are analyzed with a combination of experiments and quantum chemical calculations. VT NMR studies shed