251445-06-4

Upstream product

• 1779-49-3 Methyltriphenylphosphonium bromide 
• 122835-14-7 5-bromo-2-prop-2-ynyloxy-benzaldehyde 
• 2065-66-9 methyl-triphenylphosphonium iodide 
• 1761-61-1 5-bromosalicyclaldehyde 

Downstream Products

• 280113-43-1 5-bromo-2-hydroxystyrene 
• 1111322-39-4 C₁₇H₁₅BrOS 

Relevant academic research and scientific papers

Wittig olefination and thiol mediated 7-endo-trig radical cyclization: novel synthesis of oxepin derivatives

Thiophenol-mediated 7-endo radical cyclization for the synthesis of seven-membered cyclic ethers is described. This method can be successfully applied to synthesize various benzoxepin derivatives, which are present in many natural products as building blo

Synthesis of tricyclic aromatic compounds by the intramolecular Pauson-Khand reaction promoted by molecular sieves

Pauson-Khand reactions are carried out with different substituted aromatic enynes, yielding tricyclic cyclopentenones related to natural products such as chromenes. Enynes are easily obtained in a two-step approximation from the corresponding salicylaldehydes. The reaction is promoted by dissolved TMANO (trimethylamine N-oxide) and/or 4 A molecular sieves. This new way of induction for the Pauson-Khand reaction increases yields remarkably, allowing the reaction of some substituted alkenes which fail to react in the absence of the zeolite. Isomerization of the double bond of the cyclopentenone ring is observed except when nonterminal triple bonds are used. For trisubstituted alkenes, an interrupted Pauson-Khand process is observed with moderate yields.