4-Chloro-N-(trimethylammonio)benzamide chloride monohydrate

Area of Science:

• Chemical Crystallography
• Molecular Structure Analysis
• Organic Chemistry

Background:

• Ylides are versatile organic compounds with unique bonding characteristics.
• Understanding the structural impact of protonation is crucial for ylide chemistry.
• Previous studies have explored ylide reactivity, but detailed structural comparisons are limited.

Purpose of the Study:

• To elucidate the structural consequences of protonation on an ylide hydrochloride.
• To compare the molecular geometry of the protonated ylide cation with the neutral free ylide.
• To quantify changes in bond lengths and dihedral angles upon protonation.

Main Methods:

• X-ray crystallography was employed to determine the solid-state structure of the ylide hydrochloride hydrate.
• Comparative analysis of crystallographic data for the protonated species and the free ylide.
• Bond length and dihedral angle measurements were performed using crystallographic software.

Main Results:

• Protonation of the ylide resulted in a significant lengthening of the N-C(O) bond.
• The C=O and N-N bonds were observed to shorten by approximately 0.03 Å upon protonation.
• The dihedral angle between the phenyl and ylide planes increased, indicating a more twisted conformation.

Conclusions:

• Protonation induces distinct structural modifications in the ylide cation.
• These structural changes, including altered bond lengths and increased dihedral angles, are critical for understanding ylide behavior.
• The findings provide valuable insights into the fundamental chemistry of ylides and their salts.