The structure of the corrin nucleus from X -ray analysis

Abstract

The name corrin was adopted during the first international symposium on vitamin B 12 at Hamburg in 1957 as the name of the nucleus shown in I and considered to be present as a cobalt complex in cyanocobalamin. The name was chosen democratically by a vote of the meeting as a whole from among several proposed alternatives. It had in fact been suggested by Dr Karl Folkers and conformed with the names chosen at that time for other B 12 derivatives, since it began with the letters Co. In the case of corrin, this prefix gave rise to some misgivings; all the other derivatives named contained cobalt, corrin only the memory of the first cobalt compounds in which its presence had been deduced.