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ISSN 1998-9539

Aromatic Nucleophilic Substitution as a Side Process in the Synthesis of Alkoxy- and Crown-Substituted (Na)phthalocyanines

Alexander G. Martynov,a@ Georgy S. Berezhnoy,b Evgeniya A. Safonova,a Marina A. Polovkova,a Yulia G. Gorbunova,a,c and Aslan Yu. Tsivadzea,c
aA.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia
bHigher Chemical College of the Russian Academy of Sciences, D.I. Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia
cN.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia
@Corresponding author E-mail: Martynov.Alexandre@gmail.com
 
DOI: 10.6060/mhc181225m
 
This work reports on systematic survey for cyclotetramerization of crown- and butoxy-substituted phthalo- and naphthalonitriles in pentanol induced by DBU and PentOLi.It was demonstrated that these substrates undergo undesired side process of nucleophilic aromatic substitution of RO-groups with PentO-anions in dinitrile molecules. It results in cleavage of crown ether rings and leads to formation of inseparable mixture of (na)phthalocyanines with different ratios of intact and cleaved macrocyclic substituents. Butoxy-substituted substrates are notably less sensitive to nucleophilic attack. Application of magnesium pentoxide both as a base and templating agent does not result in crown ether ring opening reactions and affords target compounds in high yields. The results of work can be used as guidelines for the choice of bases and template agents in the synthesis of (na)phthalocyanines functionalized with macrocyclic substituents.

 

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