Synthesis of Carbon-Linked Bis(chromium carbene) Complexes, Bis(azapenams), and Bis(dioxotetraazacyclotetradecadienes)

Carbon-linked bis(chromium carbene) complexes were synthesized by the bis-alkylation of 1, n -alkyl bis(triflates). Photolysis with N-protected imidazolines followed by deprotection and acid-catalyzed dimerization produced bis(dioxotetraazacyclododecadienes) linked by five- or six-carbon aliphatic chains.