Clean and Green Approach for One-pot Synthesis of Pyrazines from Ethylenediamine and 1, 2-Diketone or Its Analogues Under Neat Reaction Condition
作者:Pranab Ghosh、Rakesh Ranjan Chakraborty
DOI:10.2174/1570178614666170609072519
日期:2017.8.22
stirrer at room temperature under neat reaction condition for 5 to 10 hrs. Results: After purification by column chromatography using silica gel(60-120 mesh) and pet-ether, ethylacetate mixture as eluent, we achieved pyrazinederivatives from moderate to high yield. Conclusion: Efficient and clean procedure for one-pot preparation of pyrazines from ethylenediamine and 1,2-diketones or with α-hydroxy ketone
Subphthalocyanine azaanalogues – Boron(III) subporphyrazines with fused pyrazine fragments
作者:Pavel A. Stuzhin、Ivan A. Skvortsov、Yuriy A. Zhabanov、Nikolai V. Somov、Oleg V. Razgonyaev、Ivan A. Nikitin、Oskar I. Koifman
DOI:10.1016/j.dyepig.2018.11.006
日期:2019.3
Pyrazine fused subporphyrazines exhibit strong absorption bands at 300–310 and 530–550 nm. The phenyl substituted derivative [Ph6Pyz3sPABCl] has an additional intense charge transfer band at 390 nm and can be reversibly reduced at −0.81 V (vs Ag/AgCl in MeCN). The influence of pyrazine rings on the geometrical and electronic structural features and spectral properties of subporphyrazine dye was also
Efficient Synthesis of a Donor-Acceptor Phthalocyanine Having Adjacently-Fused Pyrazine Rings
作者:Takamitsu Fukuda、Nagao Kobayashi
DOI:10.1246/cl.2002.866
日期:2002.8
Condensation reaction of 3,6-diphenylphthalonitrile and 2,3-dicyano-5,6-diethyl-1,4-pyrazine employing the modified lithium method has efficiently produced the novel donor-acceptor phthalocyanine derivatives having adjacently-fused pyrazine rings.
Crystalline salts of anionic free-base tetrapyrazinoporphyrazines with alkyl-substituents or an extended π-electron system
作者:Maxim A. Faraonov、Nikita G. Osipov、Nikita R. Romanenko、Alexey V. Kuzmin、Alexey B. Kornev、Pavel A. Stuzhin、Salavat S. Khasanov、Dmitri V. Konarev
DOI:10.1039/d2nj04578h
日期:——
of a 20 π-electronsystem in the dianions. Contrarily, salt 3 was obtained at the monodeprotonation of H2T(PhnPyz)Pz macrocycle, and as a result, this macrocycle shows no alternation of bonds observed in 1 and 2. Salt 3 also preserves the position of the bands in the visible-NIR range in contrast to the reduced macrocycles. All these facts indicate the preservation of an 18 π-electronsystem characteristic
游离碱八甲基四吡嗪卟啉 (H 2 TPyzPzMe 8 )、八乙基四吡嗪卟啉 (H 2 TPyzPzEt 8 ) 和四-2,3-[5,6-(9,10-菲)吡嗪]卟啉 (H 2 T(PhnPyz)Pz)已经通过相应的二腈的环状四聚化然后将获得的镁配合物脱金属来合成。这些大环在不同实验条件下的还原或去质子化产生结晶PPN + } 2 [H 2 TPyzPzMe 8 2- ]·7.4C 6 H 4 Cl 2 ( 1 ), PPN +} 2 [H 2 TPyzPzEt 8 2− ]·8C 6 H 4 Cl 2 ( 2 ) 和 cryptand(K + )}[HT(PhnPyz)Pz − ]·5C 6 H 4 Cl 2 ( 3 ) 配合物,其中用正己烷沉淀。这使我们能够研究基于阴离子 H n TPyzPzR 8 n - ( n = 2 for 1 , 2 ; n的1-3的晶体结构和光学和磁性=
Chakraborty, Rakesh Ranjan; Singha, Rabindranath; Ghosh, Pranab, Indian Journal of Heterocyclic Chemistry, 2018, vol. 28, # 3, p. 373 - 378