80251-75-8Relevant academic research and scientific papers
Practical synthesis of 5-substituted tetrazoles under microwave irradiation
Roh, Jaroslav,Artamonova, Tatjana V.,Vavrova, Katerina,Koldobskii, Grigorii I.,Hrabalek, Alexandr
, p. 2175 - 2178 (2009)
5-Substituted tetrazoles were prepared by treatment of nitriles with sodium azide and triethylammonium chloride in nitrobenzene in a microwave reactor. This practical method combines the advantages of previous procedures, including good-to-excellent yields, short reaction times, and easy isolation of the product. Moreover, sterically hindered tetrazoles, as well as those deactivated by electron-donating groups, can be prepared. Georg Thieme Verlag Stuttgart.
Benzopyrones. Part 18. Carbon-13 Nuclear Magnetic Resonance Spectroscopy of Chromones
Ellis, Gwynn P.,Williams, J. Michael
, p. 2557 - 2560 (1981)
The carbon n.m.r. spectra of 29 substituted chromones have been measured and assigned.The data for these and 10 other chromone derivatives show that the chemical shifts of six benzenoid carbon nuclei are affected to a relatively small extent ( +/- 2 p.p.m.) by changes in the substituents at C-6 and C-7 on the pyrone ring.Similarly the pyrone ring carbons (C-2, C-3, and C-4) are relatively insensitive to changes in substituents at C-6 and C-7 of the benzene ring.Carbon n.m.r. data can be used to identify isomeric chromone derivatives which are otherwise difficult to differentiate.
