742-01-8

Basic information

• Product Name: 1,3,5-TRIPHENYL-4,5-DIHYDRO-1H-PYRAZOLE
• Synonyms: 1,3,5-TRIPHENYL-2-PYRAZOLINE;1,3,5-TRIPHENYL-4,5-DIHYDRO-1H-PYRAZOLE;Luminor red-violet 440 RT;4,5-Dihydro-1,3,5-triphenyl-1H-pyrazole;1,3,5-TRIPHENYL-4,5-DIHYDRO-1H-PYRAZOLE (Luminor red-violet 440 RT);2,3,5-tri(phenyl)-3,4-dihydropyrazole;1,3,5-Triphenyl-4,5-dihydropyrazole;1,3,5-Triphenylpyrazoline
• CAS NO: 742-01-8
• Molecular Formula: C₂₁H₁₈N₂
• Molecular Weight: 298.38
• Mol File: 742-01-8.mol
• Article Data: 60

Chemical Properties

• Melting Point: 139-141℃
• Boiling Point: 453.9 °C at 760 mmHg
• Flash Point: 228.3 °C
• Appearance: /
• Density: 1.09
• Vapor Pressure: 1.99E-08mmHg at 25°C
• Refractive Index: 1.624
• PKA: -0.10±0.70(Predicted)
• CAS DataBase Reference: 1,3,5-TRIPHENYL-4,5-DIHYDRO-1H-PYRAZOLE(CAS DataBase Reference)
• NIST Chemistry Reference: 1,3,5-TRIPHENYL-4,5-DIHYDRO-1H-PYRAZOLE(742-01-8)
• EPA Substance Registry System: 1,3,5-TRIPHENYL-4,5-DIHYDRO-1H-PYRAZOLE(742-01-8)

Safety Data

• Hazardous Substances Data: 742-01-8(Hazardous Substances Data)

Usage

Properties and Applications

red light purple

InChI:InChI=1/C21H18N2/c1-4-10-17(11-5-1)20-16-21(18-12-6-2-7-13-18)23(22-20)19-14-8-3-9-15-19/h1-15,21H,16H2

Upstream product

• 2183-27-9 1,3,5-triphenyl-1H-pyrazole 
• 94-41-7 benzalacetophenone 
• 100-63-0 phenylhydrazine 
• 1215-43-6 benzoyl(thiobenzoyl)methane 
• 37799-62-5 chalcone phenylhydrazone 
• 100-42-5 styrene 
• 55849-26-8 (α-nitrobenzylidene)phenylhydrazine 
• 611-91-6 2,3-dibromo-1,3-diphenylpropane-1-one 
• 59-88-1 phenylhydrazine hydrochloride 
• 76954-14-8 5-(2-iodophenyl)-1,3-diphenyl-Δ²-pyrazoline 
• 37799-62-5 N-[(E)-1,3-Diphenyl-prop-2-en-(E)-ylidene]-N'-phenyl-hydrazine 
• 5398-64-1 2-benzylidene-1,3-diphenylpropane-1,3-dione 
• 588-64-7 benzaldehyde phenylhydrazone 
• 96-09-3 styrene oxide 

Downstream Products

• 95834-05-2 C₂₂H₁₈ClN₃O₃S 
• 105257-86-1 [4-(3,5-Diphenyl-4,5-dihydro-pyrazol-1-yl)-phenyl]-(4-nitro-phenyl)-diazene 
• 105257-84-9 [4-(3,5-Diphenyl-4,5-dihydro-pyrazol-1-yl)-phenyl]-phenyl-diazene 
• 105257-83-8 [4-(3,5-Diphenyl-4,5-dihydro-pyrazol-1-yl)-phenyl]-p-tolyl-diazene 
• 105257-82-7 [4-(3,5-Diphenyl-4,5-dihydro-pyrazol-1-yl)-phenyl]-(4-methoxy-phenyl)-diazene 
• 105257-85-0 (4-Chloro-phenyl)-[4-(3,5-diphenyl-4,5-dihydro-pyrazol-1-yl)-phenyl]-diazene 
• 81400-83-1 C₅₀H₄₂N₄ 
• 81400-86-4 C₄₉H₃₉ClN₄ 
• 81400-88-6 C₄₉H₃₉N₅O₂ 
• 79913-24-9 2-<4-(3,5-diphenyl-2-pyrazolin-1-yl)phenyl>-4,5-benzo-1,3-dithiole 
• 79913-10-3 2-[4-(3,5-Diphenyl-4,5-dihydro-pyrazol-1-yl)-phenyl]-4-phenyl-[1,3]dithiol-1-ylium; iodide 
• 81400-82-0 phenylbismethane 
• 81400-84-2 C₅₀H₄₂N₄O 
• 92708-94-6 1-(4-Benzoylphenyl)-3,5-diphenyl-2-pyrazoline 

Relevant articles and documents

Unexpected ring opening of pyrazolines with activated alkynes: synthesis of 1H-pyrazole-4,5-dicarboxylates and chromenopyrazolecarboxylates

1H-Pyrazole-4,5-dicarboxylates and chromenopyrazole carboxylates were prepared by reacting pyrazolines with activated alkynes under neat conditions without a catalyst. The products were formed via unexpected ring opening of pyrazolines with the elimination of styrene/ethylene. These types of transformations are unknown and the products formed were confirmed using their spectral/analytical data. In addition, the structures of compounds 5e and 5n were confirmed by single-crystal X-ray analysis. Control experiments were conducted to support the proposed reaction mechanism.

TBHP/Cu(OAc)2 mediated oxidation of pyrazolines: A convenient method for the preparation of pyrazoles

An efficient and simple oxidative protocol has been developed for the preparation of pyrazoles from pyrazolines mediated by TBHP/Cu(OAc)2 at room temperature. The present protocol has been successfully applied for the preparation of various pyrazole compounds from heterocyclic pyrazolines.

N-para-sulfonium salt substituted pyrazoline derivative, photocurable composition and preparation method

The invention relates to an N-para-sulfonium salt substituted pyrazoline derivative shown as the following formula (I) in the specification, a photocurable composition, and a preparation method of theN-para-sulfonium salt substituted pyrazoline derivative shown as the following formula (I). The N-para-sulfonium salt substituted pyrazoline derivative shown as formula (I) has good absorption at a wavelength of 350nm or above, and compared with a 5-substituted sulfonium salt, the N-para-sulfonium salt substituted pyrazoline derivative has the advantages of simpler and more convenient molecule synthesis steps and reduced cost of raw materials, and is more suitable for industrial production and application.