1. Verfahren zur Darstellung von Alkyloxyaryl-. Dialkyloxyaryl- und Alkylenedioxyaryl- aminopropanen bzw. deren am Stickstoff monoalkylierten Derivaten, 1914. German Patent #274,350 filed December 24. 1912. issued May 16. 1914. and assigned to E. Merck in Darmstadt
2. Formyl derivatives of secondary bases. 1920. German patent #334,555, assigned to E. Merck Chetn. Absr 17: 1804a.
3. Care must be taken with the term pipcronylacetone. This term has been used commercially in reference to two distinct chemical individuals, vis.. 1-(3,4-methylenedioxyphenyl)-2- propanone: and l-(3.4-methylenedioxyphenyl)-3-butanone. Only the former compound, also known unambiguously as either 3,4-methylenedioxyphenylacetone or 3,4-methylene- dioxybenzyl methyl ketone, gives rise ultimately to MDMA. For chemical and pharmacological details, see: Shulgin. A T. and Jacob III. P. 1982. Potential misrepresentation of 3,4-methlenedioxyphenyl-amphetamine (MDA). A toxicological warning. J. Anal. Toxicol 6:71 –75 For a toxicologkal study of the products following the use of the latter (wrong) ketone, see reference 9.
4. Elks, J. and Hey, DH.. 1943. ß-3.4-methylenedioxyphenylisopropylamine J. Chem Soc. pp 15–16
5. Ichiro. H.. 1952. a-Methyl-3.4-methylenedioxyphenethylamine, Japanese patent 1770 (’52). Chem. Abst. 48: 2097b.