97139-96-3Relevant articles and documents
Short communication: Titanium-induced synthesis of benzofurans
Jumbam,Yedwa,Masamba
experimental part, p. 157 - 160 (2012/05/20)
Ketoesters derived from the acylation of o-hydroxyacetophenone with aliphatic as well as aromatic acid chlorides undergo intramolecular cyclization in the presence of low-valent titanium to afford benzofurans in good yields. The reduction of titanium trichloride with dry zinc powder in refluxing THF takes place in the presence of the ketoester which simultaneously cyclizes as the titanium catalyst is formed, rendering the pre-reduction of titanium trichloride in a separate step unnecessary.
A new metal complex promoted system for highly selective synthesis of 4H-chromen-4-ones (chromones)
Nishinaga,Ando,Maruyama,Mashino
, p. 839 - 841 (2007/10/02)
Co(III)(salpr)(OH), a six coordinate cobalt Schiff base complex, promotes the highly selective conversion of 1-(o-hydroxyaryl)-1,3-diketones to 4H-chromen-4-ones under neutral conditions.