A Divergent Approach to β-Pyrazine-Fused meso-Tetraphenyl­diporphyrins

Abstract

We describe an alternative methodology for the synthesis of β-pyrazine-fused diporphyrins in high yields from 2-amino-5,10,15,20-tetraphenylporphyrin nickel(II) derivatives by using p-dodecylbenzenesulfonic acid as an efficient Brønsted acid catalyst in 1,4-dioxane at 90 °C. The structural characterization, material morphology and electronic properties of the products are reported.

Patent Filing System and Examination in India: An Overview in the Context of Process and Product in Chemistry

“…The claim or claims of a complete specification shall relate to a single invention or a group of inventions linked so as to form a single inventive concept, shall be clear and succinct and shall be fairly based on the matter disclosed in the specification (CGPDT 2019;CGPDTM 2008). For the purpose of discussion, we have chosen a published work (Tiwari and Nath 2018). Here, we will only show the title (hypothetical) example and claims for understanding the patentability concept.…”

“…Title: β-Pyrazine-Fused meso-Tetraphenyldiporphyrins and process for preparing same (Tiwari and Nath 2018).…”

Synthesis of 2‐Arylpyrimido[4,5‐b]porphyrins via Cyclization Reaction with Ammonia

“…Among these, the porphyrinoids fused with π-electron rich aromatic and heteroaromatic systems have often shown larger molar extinction coefficients, and smaller HOMO-LUMO energy gaps which result in enhanced absorption in the red and infrared regions of electromagnetic spectrum. [22][23][24][25][26][27] Also, diverse heterocyclic motifs such as pyrrole, [28] pyrazole, [29,30] imidazole, [31] triazole, [32] pyridine, [33] pyrazine, [34] indole, [35] quinoline, [36] phenanthroline, [37] benzoxadiazole, [37] benzoselenadiazole, [37] quinoxaline, [38] pyrrolo[1,2-a]pyrazine [10,39] and coumarinopyridine [40] fused with β-pyrrolic positions of a porphyrin ring afforded various π-extended porphyrins with encouraging photophysical properties. Nevertheless, the efforts have not been explored to synthesize β-pyrimidine-fused porphyrins yet.…”

La(OTf)3-Catalyzed Synthesis of Nickel(II) β-Iminoporphyrins and Their Conversion to β-Substituted Porphyrin-Thiazolidinone Hybrids

“…In continuation of our efforts to develop synthetic methods for various β-functionalized porphyrins, [28][29][30][31][32][33][34][35][36][37] we present herein a La(OTf)3-catalyzed synthetic protocol for the preparation of nickel(II) 2-imino-5,10,15,20-tetraphenylporphyrins, which have been employed as precursors to construct a new series of β-substituted nickel(II) porphyrin-thiazolidinone hybrids. The synthetic details and spectral properties of newly prepared porphyrins are discussed in this report.…”