Merging Molecular Recognition and Gold(I) Catalysis with Triphoscalix[6]arene Ligands

Abstract

Dedicated to Vincenzo Balzani on the occasion of his 85th birthday.

Diametric calix[6]arene-based phosphine gold(I) cavitands

“…The larger macrocycle size, its conformational adaptability, and the possibility to selectively functionalize the macrocycle offered several opportunities to design synthetic receptors and prototypes of nanodevices, instead [29]. In this context, we recently devised a new family of triphosphine calix [6]arene gold(I) complexes (Figure 1c) [30]. These cavitands are able to form (pseudo)rotaxane species, by threading viologen-based guests, with a conformational control operated by the sulfonamido hydrogen-bonding donor domain [31,32].…”

Diametric calix[6]arene gold(i) catalysts for intramolecular cyclopropanations of 1,6-dienynes

“…In the first example, a trinitro-calix [6]arene (TN) intermediate was used for the synthesis of trinuclear gold(I) complexes (Scheme 1a). 12 Here, a sulfonamide-based, upper-rim domain can promote gold(I)-catalysed cycloisomerisation of 1,6enynes 13 and form pseudorotaxane species with control of the conformation operated by three hydrogen-bonding donor moieties. 14 In the second case, the more unusual dinitro-calix [6] arene (DN) intermediate opened access to a new family of dinuclear gold(I) cavitands.…”

Facile Synthesis of Sulfonyl Chlorides/Bromides from Sulfonyl Hydrazides

“…In addition, they have been widely used as important building blocks for the manufacture of elastomers, pharmaceuticals, dyes, detergents, ion exchange resins, and herbicides [14][15][16]. Recently, they have also exhibited important applications in building synthetic receptors [17] and catalysts [18][19][20]. Given their importance in various fields, there is a strong interest in developing efficient synthetic methods for preparing them.…”