473775-05-2

Basic information

• Product Name: 1-Propen-1-one, 2-(2-pyridinyl)- (9CI)
• Synonyms: 1-Propen-1-one, 2-(2-pyridinyl)- (9CI)
• CAS NO: 473775-05-2
• Molecular Formula: C8H7NO
• Molecular Weight: 133.14728
• Product Categories: PYRIDINE
• Mol File: 473775-05-2.mol

Chemical Properties

• Appearance: /
• CAS DataBase Reference: 1-Propen-1-one, 2-(2-pyridinyl)- (9CI)(CAS DataBase Reference)
• NIST Chemistry Reference: 1-Propen-1-one, 2-(2-pyridinyl)- (9CI)(473775-05-2)
• EPA Substance Registry System: 1-Propen-1-one, 2-(2-pyridinyl)- (9CI)(473775-05-2)

Safety Data

• Hazardous Substances Data: 473775-05-2(Hazardous Substances Data)

Upstream product

• 98-98-6 2-Picolinic acid 
• 10554-54-8 3-acetyl-1,2,3-triazolo[1,5-a]pyridine 

Relevant articles and documents

Observable azacyclobutenone ylides with antiaromatic character from 2-diazoacetyl-azaaromatics

Azacyclobutenone ylides 2 and 11 were generated in solution by laser flash photolysis of 2-diazoacetylpyridine (1) and 3-diazoacetylpyridazine (10), respectively, together with the corresponding ketenes. The ylides were identified by their characteristic IR and UV spectra: 2, ν (CH3CN) 1725 cm-1, λmax 360 and 550 (br) nm; 11, ν (CH3CN) 1776 cm-1, λmax 370 and 550 (br) nm. 2-Triisopropylsilyldiazoacetylpyridine 20 upon photolysis at 5°C in CH3CN forms the ylide 21 as a rather persistent (T1/2 2 h at 25°C) purple solution, ν (CH3CN) 1718 cm-1z, λmax 245, 378 and 546 (br) nm, but no ketene is observed. Quinolyl ylide 14 and pyridyl ylides 17 and 19 with Me and 2-pyridyl substituents, respectively, with characteristic IR and UV spectra were also generated. The 1H NMR spectrum of the pyridyl ring of 21 shows substantial upfield shifts relative to those of 20. Calculated nucleus-independent chemical shifts (NICS) for 2, 11, and 21 are comparable to those for benzocyclobutadiene (22) and benzocyclobutenone enolate (23), with substantial positive values for the 4-membered rings, while the NICS values for the 6-membered rings are significantly more positive than for benzene or pyridine. Significant bond alternation is also found in the calculated ylide structures, and these results suggest strong antiaromatic character for the 4-membered rings of 2, 11, 14, 17, 19, and 21, and greatly reduced aromatic character for the 6-membered rings.

Quinolizine-2,4-diones by reversible dimerisation 2-pyridylketenes

Quinolizine-2,4-diones 11 are obtained by flash vacuum thermolysis (FVT) of 3-acyl-1,2,3-triazolo[1,5-a]pyridines 7. The reaction takes place via methyl- and phenyl(2-pyridyl)ketenes 10, which are directly observable by infrared spectroscopy in low temperature matrices. FVT of 11 regenerates the ketenes 10.