Crown ether functionalized magnetic hydroxyapatite as eco‐friendly microvessel inorganic‐organic hybrid nanocatalyst in nucleophilic substitution reactions: an approach to benzyl thiocyanate, cyanide, azide and acetate derivatives

2017 ◽  
Vol 32 (2) ◽  
Author(s):  
Maedeh Azaroon ◽  
Ali Reza Kiasat
Keyword(s):  
Crown Ether ◽  
Nucleophilic Substitution ◽  
Substitution Reactions ◽  
Nucleophilic Substitution Reactions ◽  
Organic Hybrid ◽  
Benzyl Thiocyanate

A rings-in-pores net: crown ether-based covalent organic frameworks for phase-transfer catalysis

2020 ◽  
Vol 56 (4) ◽  
pp. 595-598 ◽  
Author(s):  
Ji-Chuang Shen ◽  
Wei-Ling Jiang ◽  
Wen-Di Guo ◽  
Qiao-Yan Qi ◽  
De-Li Ma ◽  
...  
Keyword(s):  
Crown Ether ◽  
Nucleophilic Substitution ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Catalytic Performance ◽  
Covalent Organic Frameworks ◽  
Substitution Reactions ◽  
Nucleophilic Substitution Reactions

The crown ether-based covalent organic frameworks show excellent phase-transfer catalytic performance in various nucleophilic substitution reactions.

Polymer-Supported Oligo(oxyethylene)s, Sulfoxides, and Crown Ethers in Nucleophilic Substitution Reactions

1992 ◽  
Vol 57 (3) ◽  
pp. 472-486 ◽  
Author(s):  
Pavel Čefelín ◽  
Hana Hrudková ◽  
Václav Janout ◽  
Vitalii I. Kalchenko ◽  
Bohumír Valter
Keyword(s):  
Complex Formation ◽  
Crown Ether ◽  
Nucleophilic Substitution ◽  
Crown Ethers ◽  
Polymer Networks ◽  
Homogeneous System ◽  
Substitution Reactions ◽  
Nucleophilic Substitution Reactions ◽  
Activation Efficiency ◽  
Polymer Supported

The efficiency of polymer analogues of oligo(oxyethylene)s and sulfoxides in the activation of nucleophilic substitution reactions were compared by testing to the reaction between sodium phenoxide and 1-bromooctane in 1,4-dioxane. With polymer analogues of crown ethers and polymer networks having the pseudo-crown ether structure the polymer effect can be achieved, i.e. a higher activation efficiency of the polymer analogue (in the L-S system) compared with the efficiency of the unimmobilized compound (in the homogeneous system). The results suggest that several molecules of the linear activator or of side active groupings (chains) on the polymer having the podand structure take part in the formation of the activation site (for the complex formation or solvation of the cation).

The unexpected reactivity of 9-iodo-nido-carborane: from nucleophilic substitution reactions to the synthesis of tricobalt tris(dicarbollide) Na[4,4′,4′′-(MeOCH2CH2O)3-3,3′,3′′-Co3(μ3-O)(μ3-S)(1,2-C2B9H10)3]

2021 ◽  
Vol 50 (7) ◽  
pp. 2671-2688
Author(s):  
Marina Yu. Stogniy ◽  
Sergey A. Anufriev ◽  
Akim V. Shmal'ko ◽  
Sergey M. Antropov ◽  
Aleksei A. Anisimov ◽  
...  
Keyword(s):  
Nucleophilic Substitution ◽  
Substitution Reactions ◽  
Nucleophilic Substitution Reactions

An unusual reactivity of 9-iodo-nido-carborane [9-I-7,8-C2B9H11]− towards nucleophiles under strong basic conditions was revealed.

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