74794-34-6

Upstream product

• 1111-97-3 3-chloro-3-methylbut-1-yne 
• 74794-33-5 7-hydroxy-8-iodo-4-phenyl-2H-1-benzopyran-2-one 
• 2555-30-8 7-hydroxy-4-phenylcoumarin 

Downstream Products

• 74794-35-7 2,2-dimethyl-6-phenyl-2H,8H-benzo<1,2-b:5,4-b'>dipyran-8-one 

Relevant academic research and scientific papers

Synthesis of Linear Pyranocoumarins: Xanthoxyletin, 4-Methylxanthyletin, and 4-Phenylxanthyletin

A convenient synthesis of linear pyranocoumarins (2H,8H-benzodipyran-2-ones), viz., xanthoxyletin, 4-methylxanthyletin and 4-phenylxanthyletin is described which uses blocking the 8-position of appropriate 7-hydroxycoumarin derivatives with iodine and 1,1-dimethyl-2-propynylation followed by cyclisation.