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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Nomenclature of Primary Amines01:17

Nomenclature of Primary Amines

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Primary, secondary, and tertiary amines are compounds consisting of one, two, and three alkyl groups connected to the amino group (–NH2), respectively. As depicted in Figure 1, the common name of the primary amines is obtained by adding the suffix -amine to the alkyl substituent attached to the amino group as the corresponding alkylamine.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization01:13

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Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Di-hydro-cyclam dimaleate [H2(cyclam)(maleate)2].

Mbonzi Ombenga Mireille Ninon1, Mohammed Fahim, Mohammed Lachkar

  • 1LCMSN, Département de Chimie, Faculté des Sciences, Université Moulay Ismail, BP 11201, 50000 Meknès, Morocco.

Acta Crystallographica. Section E, Structure Reports Online
|October 8, 2013
PubMed
Summary

This study details the crystal structure of a molecular salt, revealing specific conformations and hydrogen bonding interactions between tetraazacyclotetradecane cations and maleate anions. These interactions form chains within the crystal structure.

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Area of Science:

  • Crystal engineering
  • Supramolecular chemistry
  • Coordination chemistry

Background:

  • Molecular salts are crucial in various chemical applications.
  • Understanding the self-assembly of macrocyclic compounds is key to designing new materials.
  • Hydrogen bonding plays a significant role in stabilizing crystal structures.

Purpose of the Study:

  • To elucidate the crystal structure of the molecular salt [1,4,8,11-tetraazacyclotetradecane-1,8-diium bis(3-carboxy-prop-2-enoate)].
  • To investigate the conformational preferences of the cyclam macrocycle and maleate anions.
  • To analyze the hydrogen bonding network governing the crystal packing.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed.
  • The crystal structure was solved and refined.
  • Analysis of bond lengths, angles, and non-covalent interactions was performed.

Main Results:

  • The asymmetric unit contains two half-cations and two maleate anions, with cations adopting trans-III conformations.
  • Intra-molecular hydrogen bonds stabilize the cyclam macrocycles.
  • Disordered O-H bonds in maleate anions and inter-molecular N-H⋯O hydrogen bonds link cations and anions into [001] chains.

Conclusions:

  • The study provides detailed structural insights into a novel molecular salt.
  • The observed hydrogen bonding patterns dictate the formation of extended chain structures.
  • This work contributes to the understanding of structure-property relationships in macrocyclic-based molecular salts.