Calixarene-Based Picolinamide Extractants for Selective An/Ln Separation from Radioactive Waste
作者:Alessandro Casnati、Nicola Della Ca'、Marco Fontanella、Francesco Sansone、Franco Ugozzoli、Rocco Ungaro、Karine Liger、Jean-Francois Dozol
DOI:10.1002/ejoc.200400793
日期:2005.6
Eleven novel ligands having picolinamide or thiopicolinamide bindinggroups at the upper or lowerrim of calix[4]-, calix[6]- and calix[8]arenes have been synthesised. The conformational properties of some of these ligands were studied in solution by means of NMR spectroscopy and in the solid state by X-ray diffraction. Their ability to extract AmIII or EuIII from water to NPHE (o-nitrophenyl hexyl
Benzyloxycalix[8]arene supported catalysts bearing N-heterocyclic carbene palladium complexes on each subunit were readily synthesized. Intermediates and catalysts were fully characterized, allowing for a fine control of their structure. X-ray diffraction analysis confirmed the formation of a calix[8]arenebearing eight well-defined NHC palladium complexes. The macrocyclic structure of calix[8]arenes allowed
A new positive-type photoresist based on mono-substituted hydroquinone calix[8]arene and diazonaphthoquinone
作者:Tomonari Nakayama、Mitsuru Ueda
DOI:10.1039/a807718e
日期:——
Mono-substituted hydroquinone calix[8]arenes 1a and 1b were synthesized by the debenzylation of O-substituted p-benzyloxyphenol calix[8]arenes which were prepared by the cyclization of p-benzyloxyphenol and paraformaldehyde in the presence of a base, followed by acylation with acetic anhydride or toluene-p-sulfonyl chloride. The calixarenes provide highly transparent films from their solutions in ethyl lactate (EL). A new positive-type photoresist based on the calix[8]arene 1b having toluene-p-sulfonate groups as a base-developable matrix and diazonaphthoquinone-4-sulfonate [DNQ(4)] or -5-sulfonate [DNQ(5)] as a photoreactive dissolution inhibitor has been successfully developed. The difference of dissolution rates for this resist system toward 1.5 wt% aqueous tetramethylammonium hydroxide (TMAH) solution reached 1300-5000 times before and after UV radiation (200 mJ cm
–2
). Thus, the photoresists containing 25 wt% of DNQs showed high sensitivities of 30-37 mJ cm
–2
(D) and contrasts of 2.5-2.8 (γ) when they were exposed to 365 nm light and post-exposure baked (PEB) at 100 °C for 90 s, followed by developing with 1.5 wt% aqueous tetramethylammonium hydroxide (TMAH) solution at room temperature. A fine positive image featuring 1 µm of minimum line and space patterns was also printed on the film which was exposed to 40 mJ cm
–2
by the contact mode.
p-(Benzyloxy)calix[8]arene Synthesis Revisited: p-(Benzyloxy)calix[4]-, p-(Benzyloxy)calix[5]-, p-(Benzyloxy)calix[7]-, and p-(Benzyloxy)bis(homooxa)calix[4]arenes
作者:Vincent Huc、Eloïne Npetgat、Vincent Guérineau、Sophie Bourcier、Amandine Dos Santos、Régis Guillot、Jean-Pierre Baltaze、Cyril Martini
DOI:10.1002/ejoc.200901405
日期:2010.11
A detailed investigation of the 4-(benzyloxy)phenol/formal-dehyde reaction shows that along with the previously described p-(benzyloxy)calix[8]arene and p-(benzyloxy)calix-[6]arene, others calixarenes are observed and easily recovered on a preparative scale. All these new calixarenes are opening interesting perspectives for the synthesis of new supramolecular hosts, easily functionalized at the para
HIGH-YIELD SYNTHESIS OF P-(BENZYLOXY)CALIX[6, 7,8]ARENES
申请人:Huc Vincent, Germain
公开号:US20150011798A1
公开(公告)日:2015-01-08
The high-yield synthesis of p-(benzyloxy)calix[6,7,8]arenes by bringing caesium hydroxide into contact with p-(benzyloxy)phenol and paraformaldehyde, and composite materials including these p-(benzyloxy)calix[6,7,8]arenes.