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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
2,4-Bis(morpholin-4-yl)-6-phen-oxy-1,3,5-triazine
Acta Crystallographica. Section E, Structure Reports Online
|November 8, 2011
Summary
This study details the crystal structure of a novel triazine compound, C(17)H(21)N(5)O(3). Key findings include a significant dihedral angle between the triazine and phenyl rings and disordered morpholine ring conformations.
Area of Science:
- Crystallography
- Organic Chemistry
- Molecular Structure Analysis
Background:
- Understanding the three-dimensional arrangement of atoms in organic molecules is crucial for predicting their properties and reactivity.
- Triazine derivatives and morpholine moieties are common scaffolds in medicinal chemistry and materials science.
Purpose of the Study:
- To elucidate the precise molecular structure and conformation of the title compound, C(17)H(21)N(5)O(3).
- To provide detailed crystallographic data for this specific organic molecule.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
- The crystal structure was analyzed to identify bond lengths, bond angles, dihedral angles, and intermolecular interactions.
Main Results:
- The dihedral angle between the triazine and phenyl rings was determined to be 80.31(11)°.
- One morpholine ring exhibited disorder across two orientations with site occupancies of 0.762(10) and 0.238(10).
- Both morpholine rings adopted chair conformations in the solid state.
Conclusions:
- The crystallographic analysis provides a definitive structural characterization of C(17)H(21)N(5)O(3).
- The observed molecular geometry, including the dihedral angle and morpholine ring conformations, offers insights into the molecule's potential chemical behavior and interactions.
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Diazonium Group Substitution: –OH and –H
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

