A new strategy for synthesis of 9-benzoyl-4-methylpyrano[2,3-f]chromene-2,8-dione using L-proline as a novel and efficient catalyst was written by Goud, E. Y.;Rao, Y. J.;Hemasri, Y.;Thirupathi, G.. And the article was included in Russian Journal of General Chemistry in 2016.Electric Literature of C6H5ClO2 The following contents are mentioned in the article:
The authors report the high yield synthesis of novel 9-benzoyl-4-methylpyrano[2,3-f]chromene-2,8-dione derivatives obtained by the reaction of 8-formyl-7-hydroxy-4-methylcoumarin with various active methylene compounds A mechanism of the tandem Knoevenagel condensation and cyclization reaction is proposed. Structures of all compounds were elucidated on the basis of 1H and 13C NMR, and mass spectrometry, and elemental anal. This study involved multiple reactions and reactants, such as 4-Chlororesorcinol (cas: 95-88-5Electric Literature of C6H5ClO2).
4-Chlororesorcinol (cas: 95-88-5) belongs to organic chlorides. An organic chloride is an organic compound containing at least one covalently bonded atom of chlorine. Their wide structural variety and divergent chemical properties lead to a broad range of names and applications. Aryl chlorides may be prepared by the Friedel-Crafts halogenation, using chlorine and a Lewis acid catalyst.Electric Literature of C6H5ClO2
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics