Synthese und Fluorescenzverhalten substituierter Δ<sup>2</sup>‐Pyrazoline

Neunhoeffer, Otto; Rosahl, Dietrich

doi:10.1002/cber.19530860217

Cited by 20 publications

(3 citation statements)

References 2 publications

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“…13 C NMR (100 MHz, CDCl 3 ): δ, ppm = 152.2, 144.8, 142.5, 138.5, 138.4, 129.1, 128.9, 128.7, 128.1, 125.9, 119.5, 113.5, 93.1, 64.1, 43.6. Characterization is in accordance with that previously described …”

Section: Methodsmentioning

confidence: 97%

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Advanced Mechanochemistry Device for Sustainable Synthetic Processes

et al. 2020

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Mechanochemistry is an alternative for sustainable solvent-free processes that has taken the big step to become, in the near future, a useful synthetic method for academia and the fine chemical industry. The apparatus available, based on ball milling systems possessing several optimizable variables, requires too many control and optimization experiments to ensure reproducibility, which has limited its widespread utilization so far. Herein, we describe the development of an automatic mechanochemical single-screw device consisting of an electrical motor, a drill, and a drill chamber. The applicability and versatility of the new device are demonstrated by the implementation of di- and multicomponent chemical reactions with high reproducibility, using mechanical action exclusively. As examples, chalcones, dihydropyrimidinones, dihydropyrimidinethiones, pyrazoline, and porphyrins, were synthesized with high yields. The unprecedented sustainability is demonstrated by comparison of EcoScale and E-factor values of these processes with those previously described in the literature.

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Section: Methodsmentioning

confidence: 97%

“…Characterization is in accordance with that previously described. 35 Synthesis of 5,10,15,20-Tetrakis(4-methoxyphenyl)porphyrin (21). Pyrrole (2.5 mmol, 0.17 mL) and 4methoxybenzaldehyde (2.5 mmol) were combined with ptoluenesulfonic acid (0.5 mmol, 95.1 mg) in the cylindrical steel chamber.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Advanced Mechanochemistry Device for Sustainable Synthetic Processes

et al. 2020

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“…[1][2][3][4][5][6] The non-of the phenyls in , . .ß-8 extension of the conjugated system,1,2•6,8,9 or replacement of the phenyl at the 3 position in1 with the CH3 or the CF3 group 3,6. …”

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confidence: 99%

Conversion of electronic excitation into thermal energy. Effect of solvent and substituents in the 4 and 5 positions on absorption and fluorescence spectra of 1,3-diphenyl-.DELTA.2-pyrazolines

Raciszewski¹,

Stephen²

1969

J. Am. Chem. Soc.

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The Aldol Condensation

Nielsen

Houlihan²

2011

Organic Reactions

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The aldol condensation takes its name from aldol (3‐hydroxybutanal) a name introduced by Wurtz who first prepared the beta‐hydroxy aldehyde from acetaldehdye in 1872. The aldol condensation includes reactions producing beta‐hydroxy aldehydes or beta‐hydroxy ketones by self condensations or mixed condensations of aldehydes and ketones as well as reactions leading to alpha, beta‐unsaturated aldehydes or alpha,beta‐unsaturated ketones formed by dehydration of intermediate beta‐aldols or beta‐ketals. The Claisen‐Schmidt condensation is most often taken to be the condensation of an aromatic aldehyde or ketone usually in the presence of a basic catalyst. The term aldol condensation has also been applied to many other condensations involving the reaction of an aldehyde or ketone. These condenations are discussed. The present review includes examples that are solely condensation reactions of aldehydes and ketones.

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Synthese und Fluorescenzverhalten substituierter Δ²‐Pyrazoline

Cited by 20 publications

References 2 publications

Advanced Mechanochemistry Device for Sustainable Synthetic Processes

Advanced Mechanochemistry Device for Sustainable Synthetic Processes

Conversion of electronic excitation into thermal energy. Effect of solvent and substituents in the 4 and 5 positions on absorption and fluorescence spectra of 1,3-diphenyl-.DELTA.2-pyrazolines

The Aldol Condensation

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Synthese und Fluorescenzverhalten substituierter Δ2‐Pyrazoline

Cited by 20 publications

References 2 publications

Advanced Mechanochemistry Device for Sustainable Synthetic Processes

Advanced Mechanochemistry Device for Sustainable Synthetic Processes

Conversion of electronic excitation into thermal energy. Effect of solvent and substituents in the 4 and 5 positions on absorption and fluorescence spectra of 1,3-diphenyl-.DELTA.2-pyrazolines

The Aldol Condensation

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Synthese und Fluorescenzverhalten substituierter Δ²‐Pyrazoline