Abstract
The compound 5,11,17,23-tetra-tert-butyl-25,27-bis(2-aminoethoxy)-26,28-dihydroxycalix[4]arene ( 2) has been synthesized by the borane reduction of 5,11,17,23-tetra-tert-butyl-25,27-bis(2-dicyanomethoxy)-26,28-dihydroxycalix[4]arene ( 1). The protonated alkylammonium form of 2 is an effective extractant for transferring the anions CrO 4 2− and Cr 2O 7 2− from an aqueous into a chloroform layer. The monoanions Cl −, CH 3CO 2 − and NO 3 −, and dianions SO 4 2− MoO 4 2− and WO 4 2− have little effect on the extraction of CrO 4 2− and CrO 7 2−. Deportonation of the dialkylammonium cation results in reversal with CrO 4 2− and Cr 2O 7 2− migrating back into the aqueous layer.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
