Selectively dehydroxylated calix[4]arenes and 1,3-dithiocalix[4]arenes; novel classes of calix[4]arenes
作者:Yuhua Ting、Willem Verboom、Leo C. Groenen、Jan-Dirk van Loon、David N. Reinhoudt
DOI:10.1039/c39900001432
日期:——
Selective modification of calix[4]arenes either by selective dehydroxylation via the reductive removal of phosphate(s), or via the Newman–Kwart rearrangement of 1,3-bis(dimethylthiocarbamoyl)calix[4]arenes yields calix[4]arenes 3 and 1,3-dithiocalix[4]arenes 6, respectively.
Enantiomerization Barrier of<i>all-cis</i>C-Me-tetrahydroxy<i>p-tert</i>-butylcalix[4]arene and Atropisomeric Equilibrium of its Tetraacetoxy Derivatives
作者:Galon Israeli、Ori Shalev、Silvio E. Biali
DOI:10.1002/ejoc.202000212
日期:2020.4.7
Reshaping the atropisomeric equilibrium. The C–Me tetrahydroxycalix[4]arene 5 undergoes in solution a dynamic process (ascribed to flip‐flop motion of the hydrogen bonds) with a barrier of ΔG‡ = 10.1 kcal mol–1. The cone form of its tetracetoxy derivative is significantly present under equilibration conditions, due to the steric destabilization of the other atropisomeric forms.
NBS bromination of tetramethoxycalix[4]arene gives a single isomer of 2,8,14,20-tetrabromo-25,26,27,28-tetramethoxycalix[4]arene. (C) 1998 Elsevier Science Ltd. All rights reserved.
GOREN, ZAFRIR;BIALI, SILVIO E., J. CHEM. SOC. PERKIN TRANS. PT 1,(1990) N, C. 1484-1487
作者:GOREN, ZAFRIR、BIALI, SILVIO E.
DOI:——
日期:——
TING, YUHUA;VERBOOM, WILLEM;GROENEN, LEO C.;VAN, LOON JAN-DIRK;REINHOUDT,+, J. CHEM. SOC. CHEM. COMMUN.,(1990) N0, C. 1432-1433
作者:TING, YUHUA、VERBOOM, WILLEM、GROENEN, LEO C.、VAN, LOON JAN-DIRK、REINHOUDT,+