7263 Angew. Chem. Int. Ed. 2006, 45, 7262–7265 2006 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim www. angewandte. org the methylene carbon atom C7. This phenomenon has also been confirmed with other examples; for example, 3, 5-diazidomethyl-4-amino- triazole (mp 928C) and its perchlorate salt (mp 758C) have much lower melting points than 3, 5-dimethyl-4-amino-triazole (mp 1968C)[20] and its perchlorate salt (mp 948C; see the ...