Tag: SXRD

Polymorphism of a porous hydrogen bond assisted ionic organic framework

admin

Dániel Vajk Horváth, Tamás Holczbauer,* Laura Bereczki, Roberta Palkó, Nóra Veronika May, Tibor Soós and Petra Bombicz  CrystEngComm (2018), accepted for publication The polymorphism of a porous, non-covalently bonded ionic organic framework is reported. The framework is constructed by hydrogen bonding and anion⋯π interactions. In a solvatomorphic lattice, pyridine takes part in the framework formation. The role of molecular rigidity in framework construction is proven by analogous non-porous crystals, where polymorphism also appears. Full text

Expanding the Pillararene Chemistry: Synthesis and Application of a 10 + 1 Functionalized Pillar[5]arene

admin

Márton Bojtár, András Simon, Petra Bombicz, and István Bitter Organic Letters (2017)  19 (17), 4528–4531 A novel functionality was introduced in the pillararene family by the Claisen rearrangement of monoallyl pillar[5]arene. This new key derivative can lead to the formation of a 10 + 1 functionalized derivative, a useful scaffold for further derivatization. Except for the previously known monodeprotection reaction, all steps proceed efficiently with high yields and easy separation. In addition, a solvent-responsive pseudo[1]rotaxane was synthesized based on this novel functionality. Read More …

A novel 1,3,5-triaminocyclohexane-based tripodal ligand forms a unique tetra(pyrazolate)-bridged tricopper(II) core: solution equilibrium, structure and catecholase activity

admin

Attila Szorcsik, Ferenc Matyuska, Attila Bényei, Nóra V. Nagy, Róbert K. Szilágyi and Tamás Gajda* Dalton Trans., 2016, 45, 14998-15012   ABSTRACT Copper(II) complexes of a polydentate tripodal ligand L × 3HCl (L = N,N’,N’’-tris(5-pyrazolylmethyl)-cis, cis-1,3,5-triaminocyclohexane) were characterized in both solution and solid states. Combined evaluation of potentiometric, UV-VIS, and EPR data indicated the formation of two mononuclear (CuHL, CuL) and three trinuclear (Cu3H−xL2, x = 2, 3, 4) complexes. The high stability and spectroscopic properties of the CuL species indicate Read More …

Strain-Driven Direct Cross-Aldol and -Ketol Reactions of Four-Membered Heterocyclic Ketones

admin

 Zoltán Dobi, Tamás Holczbauer, and Tibor Soós* Org. Lett., 2015, 17 (11), pp 2634–2637 Abstract Owing to the ring strain and α-heteroatom effect, the four-membered heterocyclic ketones can undergo direct cross-aldol and -ketol reactions without the need for preformed enol or “enolate-like” intermediates. Besides the organocatalyzed cross-ketol addition onto their highly active carbonyl group, their ability to act as a nucleophilic donor has also been explored. As a result, a number of discrete aldol adducts were synthesized and the distinct reactivities were successfully combined into Read More …