62415-98-9

Basic information

• Product Name: r-1,c-2,t-3,t-4-Tetra(4-pyridyl)cyclobutane
• Synonyms: r-1,c-2,t-3,t-4-Tetra(4-pyridyl)cyclobutane
• CAS NO: 62415-98-9
• Molecular Weight: 364.45
• Mol File: 62415-98-9.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: r-1,c-2,t-3,t-4-Tetra(4-pyridyl)cyclobutane(CAS DataBase Reference)
• NIST Chemistry Reference: r-1,c-2,t-3,t-4-Tetra(4-pyridyl)cyclobutane(62415-98-9)
• EPA Substance Registry System: r-1,c-2,t-3,t-4-Tetra(4-pyridyl)cyclobutane(62415-98-9)

Safety Data

• Hazardous Substances Data: 62415-98-9(Hazardous Substances Data)

Upstream product

• 67-56-1 methanol 
• 13362-78-2 trans-1,2-bis(pyridin-4-yl)ethene 

Relevant articles and documents

[2+2] Photodimerization of bispyridylethylenes by a controlled shift of the protonation equilibrium

Irradiation of trans-4,4′-bispyridylethylene in the presence of 1 equiv of concd HCl produced a syn dimer with high selectivity, whereas irradiation in the presence of more than 2 equiv of concd HCl or in the absence of HCl gave a mixture of dimers and by-products with much lower selectivity. This indicated that a suitable amount of acid served as a catalyst for the [2+2] photodimerization of BPEs through cation-π interactions between the pyridinium and pyridine rings.

Azastilbenes. 2. Photodimerization

The photochemical behavior of several azastilbenes has been followed in concentrated solution and in the solid state.In acetonitrile and benzene isomerization and dimerization occur, the reactions being generally faster in acetonitrile.In methanol, however, photoreduction as well as photoaddition of the solvent intervene and are important processes.With irradiation in the solid state, dimerization occurs only for some azastilbenes and their quaternary salts, depending on the orientations of the molecules within the crystal lattice and the distances between adjacent double bonds (3.5-4.2 Angstroem).X-ray analysis has shown that trans-1,2-di(2-pyrazinyl)ethylene crystallizes in two distinct modifications of which only one has a crystal stacking suitable for topochemical dimer formation.The dimers were characterized by 1H and 13C NMR, IR, and mass spectroscopy.The crystalline and molecular structures of five of them were determined by X-ray diffraction, namely cyclobutane dimers of 1,2-di(4-pyridyl)ethylene, 1,2-di(2-pyridyl)ethylene, 1,2-di(2-pyrazinyl)ethylene (all three r-ctt dimers), and 1-(3-pyridyl)-2-(2-pyrazinyl)ethylene (r-ctt head-to-head and head-to-tail dimers).