Additions and corrections
Preparation of nitropyridines by nitration of pyridines with nitric acid
Alan R. Katritzky, Eric F. V. Scriven, Suman Majumder, Rena G. Akhmedova, Anatoliy V. Vakulenko, Novruz G. Akhmedov, Ramiah Murugan and Khalil A. Abboud
Organic & Biomolecular Chemistry, 2005, 3, 538–541 (DOI: 10.1039/b413285h) Amendment published 21st August 2006
The authors regret the following error:
In our paper referenced above, we gave two procedures (labeled ‘method A’ and ‘method B’) for the nitration process. Our work utilized mostly method A and only one example of method B was given in the manuscript.
We had no problems with method B. However, it has been brought to our attention that when method B is used without adequate cooling (down to −5 °C) then violent decomposition can result. This is probably caused by the generation of nitrogen pentoxide (N2O5) which is known (M. B. Talawar, R. Sivabalan, B. G. Polke, U. R. Nair, G. M. Gore and S. N. J. Asthana, Hazard. Mater., 2005, 124, 153) to be an unstable material.
We therefore wish to correct our article by adding to method B the notice that the whole procedure until the addition of concentrated aqueous sodium hydroxide should be carried out at −5 °C.
The Royal Society of Chemistry apologises for this error and any consequent inconvenience to authors and readers.