664375-75-1

Upstream product

• 1779-49-3 Methyltriphenylphosphonium bromide 
• 664375-74-0 4-[N,N-bis(4-methoxyphenyl)amino]-2-bromobenzaldehyde 
• 664375-73-9 (3-bromo-4-(1,3-dioxolan-2-yl)phenyl)bis(4-methoxyphenyl)amine 
• 203583-95-3 2-(2-bromo-4-iodophenyl)-[1,3]dioxolane 
• 261903-03-1 2-bromo-4-iodobenzaldehyde 
• 26670-89-3 2-bromo-4-iodo-1-methylbenzene 

Relevant academic research and scientific papers

A High-Spin and Durable Polyradical: Poly(4-diphenylaminium-1,2-phenylenevinylene)

A purely organic, high-spin, and durable polyradical molecule was synthesized: It is based on the non-Kekule- and non-disjoint design of a φ-conjugated poly(1,2-phenylenevinylene) backbone pendantly 4-substituted with multiple robust arylaminium radicals. 4-N,N-Bis(4-methoxy- and -tert-butylphenyl)amino-2-bromostyrene 5 were synthesized and polymerized with a palladium-phosphine catalyst to afford the head-to-tail-linked polyradical precursors (1). Oxidation of 1 with the nitrosonium ion solubilized with a crown ether gave the aminium polyradicals (1+) which were durable (half-life > 1 month) at room temperature in air. A high-spin ground state with an average S = (4.5)/2 for 1a+ was proved even at room temperature by magnetic susceptibility, magnetization, ESR, and NMR measurements.