174791-85-6

Upstream product

• 885681-96-9 4-bromo-1-(bromomethyl)-2-iodobenzene 
• 260558-15-4 4-bromo-2-iodo-1-methylbenzene 
• 50-00-0 formaldehyd 

Downstream Products

• 1601464-01-0 4-bromo-2-ethynyl-1-vinylbenzene 
• 1601464-10-1 6-bromo-2-(5-bromo-2-vinylphenyl)-1,8b-dihydrobiphenylene 
• 1601464-27-0 trimethyl((5-bromo-2-vinylphenyl)ethynyl)silane 
• 150830-92-5 4-bromo-2-(N-t-butylhydroxyamino)styrene 

Relevant academic research and scientific papers

Dihydrobiphenylenes through ruthenium-catalyzed [2+2+2] cycloadditions of ortho-alkenylarylacetylenes with alkynes

A new synthetic route to dihydrobiphenylenes has been developed. The process involves a mild RuII-catalyzed [2+2+2] dimerization of ortho-alkenylarylacetylenes or its more versatile variant, the Ru-catalyzed [2+2+2] cycloaddition of ortho-ethynylstyrenes with alkynes. Mechanistic aspects of this [2+2+2] cycloaddition are discussed. A new synthetic route to dihydrobiphenylenes involves a mild RuII-catalyzed [2+2+2] dimerization of ortho-alkenylarylacetylenes or its more versatile variant, the Ru-catalyzed [2+2+2] cycloaddition of ortho-ethynylstyrenes with alkynes. The mechanistic aspects of this [2+2+2] cycloaddition are also discussed. Copyright

Synthesis of and ferromagnetic coupling in poly(phenylenevinylene)s bearing built-in t-butyl nitroxides

Poly[[2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]-1,4- or 1,2-phenylene]vinylene] was synthesized by polymerizing 4- or 2-bromo-2- or 4-[N-t-butyl-N-(triethylsiloxy- or t-butyldimethylsiloxy)amino]styrene with a palladium catalyst, respectively. They were deprotected and chemically oxidized to yield poly(1,4- or 1,2-phenylenevinylene)s bearing a 2- or 4-substituted built-in nitroxide radical. The polyradicals were chemically stable, and their spin concentration was increased to 0.8 spin/unit. A SQUID measurement which included the corresponding diradicals and triradicals indicated that a partial, but strong, intramolecular ferromagnetic coupling was established through the conjugated backbone, despite a spin defect in the side radical moiety, for the poly(1,2- phenylenevinylene) bearing 4-substituted built-in nitroxide radical.