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

Area of Science:

• Organometallic Chemistry
• Supramolecular Chemistry
• Catalysis

Background:

• Cavitands are host molecules with a defined cavity.
• Gold(I) complexes are known catalysts for various organic transformations.
• Controlling the spatial arrangement of metal centers in supramolecular hosts is crucial for catalytic activity.

Purpose of the Study:

• To synthesize and characterize novel diametric phosphine gold(I) cavitands.
• To investigate the influence of the 1,2,3-alternate geometry on the properties of these gold(I) complexes.
• To explore the preliminary catalytic activity of these cavitands in a model cycloisomerization reaction.

Main Methods:

• Synthesis of novel phosphine gold(I) cavitands.
• Characterization using spectroscopic and analytical techniques.
• Preliminary catalytic studies using a model cycloisomerization of 1,6-enynes.

Main Results:

• Successful synthesis and characterization of a new class of gold(I) cavitands with a 1,2,3-alternate geometry.
• The orientation of the gold(I) nuclei relative to the macrocyclic cavity was found to influence catalytic performance.
• Demonstrated preliminary catalytic activity in the cycloisomerization of 1,6-enynes.

Conclusions:

• Novel phosphine gold(I) cavitands with a defined 1,2,3-alternate geometry have been developed.
• The spatial arrangement of gold(I) centers within the cavitand cavity impacts catalytic efficiency.
• These findings open avenues for designing tailored supramolecular gold catalysts.