Kuhn; Badstuebner; Grundmann Chemische Berichte, 1936 , vol. 69, p. 102 Full Text Show Details Batty et al. Journal of the Chemical Society, 1937 , p. 759 Full Text Show Details I.G. Farbenind. Patent: DE725275 , 1936 ; DRP/DRBP Org.Chem.