Adrian P. Kybett

The introduction of SCF3 into aromatic substrates using CuSCF3 and alumina-supported CuSCF3

Abstract Trifluoromethylthiocopper(I) has been readily prepared from the silver analogue, using a metathetical reaction with copper(I) bromide. Homogeneous CuSCF 3 and the supported reagent CuSCF 3 -alumina have been compared in their reactivity towards aryl iodides, in order to form trifluoromethylaryl sulphides in good yields.

Montmorillonite supported transition metal salts as Friedel–Crafts alkylation catalysts

Montmorillonite supported zinc and nickel chlorides are highly active and selective reagents for the catalysis of Friedel–Crafts alkylations.

19F mas NMR and FTIR analysis of the adsorption of alkali metal fluorides onto alumina

Abstract NaF, KF, RbF and CsF have been adsorbed onto alumina and the resulting reagents have been analysed by IR and 19 F magic-angle spinning NMR spectroscopy. The results show that MF reacts with the alumina surface to form AlF 6 3− , and CO 3 2− is formed as a byproduct due to the adsorption and reaction of atmospheric CO 2 .

A comparison of the adsorption of KF and NH4F onto silica gel

Abstract Silica gel has been fluorinated with KF, Na2SiF6, NH4F and (NH4)2SiF6, and the resulting reagents have been analysed by 19F and 29Si magic angle spinning NMR and infrared spectroscopy. Fluorination with NH4F and (NH4)2SiF6 results in the formation of (SiO)3SiF groups at the surface, where F has replaced OH, whereas the anion SiF2−6 is formed when silica is fluorinated with KF.

Guanidine catalysts supported on silica and micelle templated silicas. New basic catalysts for organic chemistry

The preparation of guanidines covalently linked to the framework of Micelle Templated Silicas is discussed. These materials can behave as efficient catalysts in base catalysed epoxidation. Control over surface chemistry is very beneficial in enhancing selectivity and efficiency with respect to utilisation of the oxidant hydrogen peroxide. Such systems contribute to the search for cleaner manufacturing technologies. The same catalysts are active in the Linstead variation of the Knoevenagel reaction. Initial work aimed at preparing chiral guanidines attached to Micelle Templated Silica is also presented.

Catalytic oxidation of organic substrates using alumina supported chromium and manganese

Supported reagents prepared by adsorption of chromium(VI) and manganese(VII) on alumina are capable of catalysing the aerial oxidation of organic substrates.

The adsorption of Na2[Cu(CN)3] onto alumina: The existence of both crystalline and solvated forms on the surface

Abstract The sodium cuprous cyanide salt, Na 2 [Cu(CN) 3 ], has been adsorbed onto alumina, and the i.r. spectra, fast atom bombardment mass spectra and scanning electron micrographs of the reagent over a range of Na 2 [Cu(CN) 3 ] loadings have been obtained. These show that, at high loadings, Na 2 [Cu(CN) 3 ] is present on the surface in a crystalline form. At low loadings Na 2 [Cu(CN) 3 ] is dispersed over the alumina surface, with the i.r. spectrum corresponding to that of aqueous [Cu(CN) 3 ] −2 . There appears to be good correlation in the mass spectrum between the percentage intensity of the sodium ( m/z 23) peak relative to the sum of the Na + and Al + intensities, and the loading of Na 2 [Cu(CN) 3 ]. The scanning electron micrographs of the reagent at high loading clearly show crystalline material; at low loadings there is no difference in appearance between the reagent and uncoated alumina.