The synthetic utility of alkyl‐onium salt compounds is widely recognized in the field of
organic chemistry. Among the wide variety of onium salts, quaternary ammonium …

Hydrogen bond donor catalysis represents a rapidly growing subfield of organocatalysis.
While traditional hydrogen bond donors containing N–H and O–H moieties have been …

Noncovalent interactions originated from C (sp3)–H··· X hydrogen bonds frequently appear
in different areas such as crystal engineering, protein binding, and supramolecular …

The use of trialkylphosphonium oxoborates (TOB) as catalysts is reported. The site-isolated
borate counter anion in a TOB catalyst increases the availability of C (sp3)–H to interact with …

Highly functionalized small and medium ring size chiral (hetero)-cycles are amongst the
most important structural units being present in a variety of biologically active (natural) …

Although quaternary ammonium and phosphonium salts are known as important catalysts in
phase-transfer catalysis, the catalytic ability of tertiary sulfonium salts has not yet been well …

Nitrogen-encompassing bioactive molecules can be regarded as the most frequently cited
moieties, occurring either as natural products or as synthetically constructed chemical …

Quaternary ammoniums associated with bis (trifluoromethane) sulfonimide (NTf2) or tetrakis
[3, 5-bis (trifluoromethyl) phenyl] borate (BARF) counterions were readily prepared from …

A piperidine‐derived tetraalkylammonium salt with a non‐coordinating counteranion worked
as an effective hydrogen‐bonding catalyst in an aza‐Diels–Alder reaction of imines and a …

The direct three-component aza-Diels–Alder reaction of aromatic aldehyde, aromatic amine,
and 2-cyclohexen-1-one was catalyzed by hen egg white lysozyme for the first time. Under …