In organic chemistry, quaternary ammonium cations, also known as quats, are positively-charged polyatomic ions of the structure [NR4]+, where R is an alkyl group, an aryl group [1] or organyl group.

2023年5月9日 · Studies performed mainly on model QAC compounds (typically tetraalkyl ammonium compounds) suggest that several transporters, including P-glycoprotein (P-gp), organic cation transporters (OCTs), and thiamine transporters (ThTRs), may contribute to QAC disposition in the human body.

2019年5月6日 · Quaternary ammonium compounds, referred to as QACs, are cationic substances with a structure on the edge of organic and inorganic chemistry and unique physicochemical properties. The purpose of the present work is to introduce QACs and …

2023年11月8日 · Quaternary ammonium salts are chemical compounds with the formula NR +4 X –, where R is an alkyl or aryl group and X is an anion (typically a halide ion). The quaternary ammonium cations are always positively charged.

In organic chemistry, quaternary ammonium salts are used as phase transfer catalysts for reactions involving immiscible solvent systems, such as the synthesis of dichlorocarbenes with chloroform and sodium hydroxide. The synthesis of this cation from ammonia is …

2019年5月6日 · Quaternary ammonium compounds, referred to as QACs, are cationic substances with a structure on the edge of organic and inorganic chemistry and unique physicochemical properties. The purpose of the present work is to introduce QACs and …

Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR 4+ with R being alkyl groups. Unlike the ammonium ion NH 4+ itself and primary, secondary, or tertiary ammonium cations, the quaternary ammonium cations are permanently charged, independent of the pH of their solution.

2024年10月8日 · Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR+ 4, R being an alkyl group or an aryl group. Unlike the ammonium ion (NH+ 4) and the primary, secondary, or tertiary ammonium cations, the quaternary ammonium cations are permanently charged, independent of the pH of their solution.

Quaternary ammonium ions are positively charged ions that consist of a central nitrogen atom bonded to four organic groups and carry a permanent positive charge.

2014年11月13日 · Quaternary ammonium cations, also known as quats, are nitrogen-containing ions with four alkyl or aryl points of attachment to the nitrogen in order to yield a permanent positive charge on the molecule (structure NR 4 +).