2817-71-2

Basic information

• Product Name: 1-Ethylpyrazole
• Synonyms: 1-ETHYLPYRAZOLE;AKOS PAO-1141;AKOS B006762;ART-CHEM-BB B006762;1-ETHYL-1H-PYRAZOLE;Albb-004429;1H-Pyrazole, 1-ethyl-
• CAS NO: 2817-71-2
• Molecular Formula: C₅H₈N₂
• Molecular Weight: 96.13
• EINECS: 1312995-182-4
• Product Categories: Building Blocks;C3 to C5;Chemical Synthesis;Heterocyclic Building Blocks;New Products for Chemical Synthesis;Pyrazoles;Pyrazoles & Triazoles;Pyrazoles & Triazoles
• Mol File: 2817-71-2.mol
• Article Data: 10

Chemical Properties

• Melting Point: 82.75°C (estimate)
• Boiling Point: 137°C(lit.)
• Flash Point: 38.612 °C
• Appearance: /
• Density: 0.9537
• Vapor Pressure: 7.73mmHg at 25°C
• Refractive Index: 1.4670 to 1.4710
• Storage Temp.: Room temperature.
• PKA: 2.27±0.10(Predicted)
• CAS DataBase Reference: 1-Ethylpyrazole(CAS DataBase Reference)
• NIST Chemistry Reference: 1-Ethylpyrazole(2817-71-2)
• EPA Substance Registry System: 1-Ethylpyrazole(2817-71-2)

Safety Data

• RIDADR: UN 1993 3/PG III
• HazardClass: IRRITANT
• PackingGroup: III
• Hazardous Substances Data: 2817-71-2(Hazardous Substances Data)

Usage

Synthesis Reference(s)

Synthetic Communications, 20, p. 2849, 1990 DOI: 10.1080/00397919008051498

InChI:InChI=1/C5H8N2/c1-2-7-5-3-4-6-7/h3-5H,2H2,1H3

Upstream product

• 288-13-1 NH-pyrazole 
• 540-51-2 2-bromoethanol 
• 75-03-6 ethyl iodide 
• 74-96-4 ethyl bromide 

Downstream Products

• 943106-34-1 C₈H₁₅N₃ 
• 933778-29-1 N-ethyl-1H-5-methylpyrazole-4-carboxaldehyde 
• 1047645-57-7 4-(4-bromo-1-ethyl-1H-pyrazol-5-yl)-N-((1S)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-2-thiophenecarboxamide 
• 1047645-54-4 4-(4-chloro-1-ethyl-1H-pyrazol-5-yl)-N-((1S)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-2-thiophenecarboxamide 
• 1047644-59-6 N-((1S)-2-amino-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-4-(4-bromo-1-ethyl-1H-pyrazol-5-yl)-2-thiophenecarboxamide 
• 1047644-58-5 N-((1S)-2-amino-1-{[2-(trifluoromethyl)phenyl]methyl}ethyl)-4-(4-chloro-1-ethyl-1H-pyrazol-5-yl)-2-thiophenecarboxamide 
• 1047645-47-5 1,1-dimethylethyl [2-({[5-chloro-4-(1-ethyl-1H-pyrazol-5-yl)-2-thienyl]carbonyl}amino)-3-phenylpropyl]carbamate 
• 1047644-54-1 N-[2-amino-1-(phenylmethyl)ethyl]-5-chloro-4-(1-ethyl-1H-pyrazol-5-yl)-2-thiophenecarboxamide 
• 1007110-53-3 1-ethyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole 
• 1007488-29-0 (1-ethyl-1H-pyrazol-5-yl)methanol 
• 902837-62-1 1-ethyl-1H-pyrazole-5-carbaldehyde 
• 304903-10-4 1-ethyl-1H-pyrazole-4-carbaldehyde 
• 71229-85-1 4-bromo-1-ethyl-1H-pyrazole 
• 288-13-1 NH-pyrazole 

Relevant articles and documents

Enthalpies of combustion, heat capacities, and enthalpies of vaporization of 1-ethylimidazole and 1-ethylpyrazole

The standard (p° = 0.1 MPa) molar enthalpies of formation for liquid 1-ethylimidazole and 1-ethylpyrazole were derived from the standard molar enthalpies of combustion ΔcH°m, in oxygen, at T = 298.15 K, measured by static bomb combustion calorimetry. The molar heat capacities of both liquids were measured in the temperature range (280 to 365 ) K by differential scanning calorimetry. The standard molar enthalpies of vaporization Δg1H°m, at the temperature T = 298.15 K were measured by Calvet microcalorimetry. The derived standard molar enthalpies of formation in the gaseous state are compared. -ΔcH°m(1)/(kJ·mol-1) Δg1H°m/(kJ·mol-1) 1-Ethylimidazole 3155.7 + 4.7 66.0 + 3.9 1-Ethylpyrazole 3190.2 + 2.1 53.3 + 2.4

Protonated alkylpyrazole ionic liquid and method using same for synthesizing cyclic carbonate

The invention relates to protonated alkylpyrazole ionic liquid with a structural formula as shown in the description, wherein n is equal to 1, 2, 3 or 4, and X is Cl, Br or I. The invention further discloses a method for synthesizing cyclic carbonate by using the protonated alkylpyrazole ionic liquid; the protonated alkylpyrazole ionic liquid and an epoxy compound are added into a high-pressure reaction kettle according to a molar ratio of 1 : (25 to 300), CO2 is introduced until pressure is 1-3 MPa, and constant-temperature constant-pressure reaction is performed for 1-5 hours at a temperature of 100-150 DEG C, and post-treatment is performed after reaction is ended, thus obtaining the cyclic carbonate. The method solves the problems that CO2 activation is difficulty, a catalyst is dear, a poisonous organic solvent is used, a synthesis process is complex, reaction conditions are harsh and the like in an existing method. The advantages of simple synthesis process, high catalyst activity, environmental friendliness, low cost and the like are achieved.

NEW THIENOPYRIMIDINE DERIVATIVES, A PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM

Compounds of formula (I): wherein R1, R2, R3, R4, R5, R6, R7, R12, X, A and n are as defined in the description.