The white-rot fungi produce wide range of extracellular enzymes (especially ligninolytic enzymes) and they can degrade complicated and difficult degradable compounds. An immobilization of enzymes causes their stability, reusability and cheapness, so they could be effectively used in biotechnologies and other branches. In this work we focused on the optimization of isolation procedure namely pre...

Although the hydrogen-bonding ability of the α hydrogen atoms on tetraalkylammonium salts is often discussed with respect to phase-transfer catalysts, catalysis that utilizes the hydrogen-bond-donor properties of tetraalkylammonium salts remains unknown. Herein, we demonstrate hydrogen-bonding catalysis with newly designed tetraalkylammonium salt catalysts in Mannich-type reactions. The structu...

In the title salt, C6H14N(+)·NO3 (-), the cyclo-hexyl ring adopts a chair conformation. The ammonium group occupies an equatorial position and the crystal struture is stabilized by inter-molecular N-H⋯O hydrogen-bonding inter-actions, resulting in a three-dimensional network.

In the title salt, C(6)H(18)N(3) (3+)·3NO(3) (-), the piperazine ring adopts a chair conformation and the ethyl-ammonium group is equatorial relative to the piperazine ring, and in an all-trans conformation. In the crystal, strong charge-assisted N-H⋯O hydrogen bonds link the piperazinediium trications and the nitrate anions into a three-dimensional network.

A non-enzymatic acetyl transfer-based kinetic resolution of primary allylic amines is reported. The process involves the use of (1S,2S)- in conjunction with a supported ammonium salt and affords the corresponding enantio-enriched N-acetylated allylic amines with unprecedented levels of selectivity (s-factors up to 34).

In the crystal structure of the title salt, C(3)H(10)N(+)·C(7)H(7)O(3)S(-), N-H⋯O hydrogen bonds involving the ammonium groups of the cations and the sulfonate O atoms result in the formation of a three-dimensional network.

In the title mol-ecular salt, (C(6)H(16)N)(2)[CuCl(4)], the Cu(II) ion adopts an extremely distorted tetra-hedral coordination geometry. All the ammonium H atoms are involved in N-H⋯Cl hydrogen bonds, which serve to link the cations and anions into chains propagating along the c-axis direction.

In the title hydrated salt, C(7)H(9)ClN(+)·Cl(-)·0.5H(2)O, the water O atom lies on a crystallographic twofold axis. In the crystal, the monoprotonated 4-chloro-benzyl-ammonium cation forms N-H⋯Cl and N-H⋯O hydrogen bonds and the water mol-ecule forms O-H⋯Cl hydrogen bonds, generating layers lying parallel to the bc plane.

A one-pot synthesis of polyrotaxanes has been developed. The method employs a supramolecular monomer comprising a polymerizable ammonium salt and crown ether, in combination with dynamic ADMet polymerization. Ultimately, highly efficient complexation, polymerization, and end-capping were accomplished in a single operation to yield polyrotaxanes with M(w) up to 19.3 kDa and >80% of the repeat un...

The structure of the title non-centrosymmetric organic-inorganic hybrid salt, (C8H12NO)2[ZnCl4], consists of two 4-meth-oxy-benzyl-ammonium cations sandwiched between anionic layers, formed by isolated tetra-chlorido-zincate tetra-hedra. The double layers extend parallel to the ac plane. The crystal packing is assured by Coulombic inter-actions and by a complex N-H⋯Cl and C-H⋯Cl hydrogen-bondin...