Efficient ecofriendly synthesis of pyrazole acryloyl analogs by amino acid catalysis
作者:Faryal Chaudhry、Nadia Asif、Syed Salman Shafqat、Amir Azam Khan、Munawar Ali Munawar、Misbahul Ain Khan
DOI:10.1080/00397911.2016.1164863
日期:2016.4.17
effective green approach of Knoevenagel condensation and arylidene formation with the substrates involves pyrazole-3-carbaldehydes and active methylenes under catalytic action of glycine (the simplest amino acid) in dimethylsulfoxide. These reactions were successfully carried out at room temperature. GRAPHICAL ABSTRACT
Sulfamic acid as a green, reusable catalyst for stepwise, tandem & one-pot solvent-free synthesis of pyrazole derivatives
作者:Veera Swamy Konkala、Pramod Kumar Dubey
DOI:10.1016/j.cclet.2017.02.005
日期:2017.7
Abstract Sulfamic acid (SA) is a bi-functional, cost-effective and reusable green catalyst for the synthesis of 4-(pyrazol-4-yl)methylenepyrazol-5(4 H )-one derivatives by one-pot, three-component condensation of pyrazol-4-carbaxaldehydes, β -ketoesters and phenyl hydrazine (Route-I). In addition to this method, another simple condensation of pyrazol-4-carbaxaldehydes with pyrazolone in the presence
Pyrazole based solid state emissive NLOphores with TICT characteristics: Synthesis, DFT and TDDFT studies
作者:Sandip K. Lanke、Nagaiyan Sekar
DOI:10.1016/j.dyepig.2015.11.014
日期:2016.3
A series of pyrazole based D-pi-A derivatives with large stokes shift have been synthesized from 1,3-dipheny-1H-pyrazole-3-carbaldehyde by reacting with a series of active methylenes and characterized by spectroscopic analysis. The synthesized dyes show blue to red solid state emissions in the range of 441 -604 nm. All the pyrazole dyes, except dye 2.3.6.4-((1,3-dipheny-1H-pyrazole-4-yl)methylene)-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one, display solid state emission characteristics. Experimental absorption and emission wavelengths measured for all the synthesized dyes are in good agreement with those predicted using the Time-Dependent Density Functional Theory. In this paper, the static first, second hyperpolarizability and its related properties estimated for pyrazole based "push-pull" dyes using B3LYP functional with 6-311G(d) basis sets. We have performed experimental calculation to determine the first hyperpolarizability using solvatochromic shift method. These dyes show high first hyperpolarizability in the range of 39.96-296.35 x 10(-30) esu by theoretical method and 35.8 -302 x 10(-30) esu by solvatochromic shift method. (C) 2015 Elsevier Ltd. All rights reserved.