title: Convenient direct synthesis of bisformylated calix[4]arenes via ipso substitution.
abstract: [reaction: see text] A facile synthesis of bisformylated calix[4]arenes via ipso substitution of p-tert-butylcalix[4]arenes through treatment with hexamethylenetetramine/trifluoroacetic acid is described. Under identical conditions, p-tert-butylcalix[4]arene tetramethyl ether 4 gives proximally substituted bisformylated derivative 4a in a pinched cone conformation.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi. hmchawla@chemistry.iitd.ernet.in
authors.forename: H M
authors.initials: HM
authors.lastname: Chawla
authors.forename: N
authors.initials: N
authors.lastname: Pant
authors.forename: Bindu
authors.initials: B
authors.lastname: Srivastava
authors.forename: Shailesh
authors.initials: S
authors.lastname: Upreti