Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Reagents and conditions: (a) cycloalkylamine (NEAT or n-BuOH), 180 °C, 24–72 h; (b) p-phenylendiamine, 1.25 M HCl in EtOH, n-BuOH, 180 °C, 16 h; (c) trans-diaminocyclohexane, n-BuOH, 180 °C, 72 h; and (d) acyl chloride or anhydride, dry pyridine, rt, 16 h; (R1, R2 = see Table 6).
