Nycomed Salutar, Inc.

Catalytica, Inc.

Jere D Fellman

Jo Klaveness

Scott M Rocklage

Arne Berg

Torsten Almen

Harald Dugstad

Pal Rongved

Alan D Watson

Michael Droege

Sook-Hui Kim

Brent Segal

Robert James Saxton

Eric G Derouane

Paul R Wentrcek

C Allen Chang

An x-ray contrast medium containing a multinuclear complex of the formula (M.sub.6 (.mu..sub.3 B).sub.8 A.sub.v).sub.x L.sub.w, wherein M is Mo, W, Re Tc, V, Nb, Ta, Ru, or Fe; .mu..sub.3 B represent a tridentate bridging atom; A is a non-bridging atom; L is a ligand coordinately bonded to at least one M atom; x is a positive integer; and v and w are independently zero or positive integers.

Multinuclear complexes for X-ray imaging

Multinuclear complexes for x-ray imaging

The selective isopropylation of a naphthyl compound to diisopropylnaphthalene enhanced in the 2,6-diisopropylnaphthalene isomer is obtained in the presence of an acidic crystalline molecular sieve catalyst having twelve membered oxygen rings. The catalyst pore aperture dimension ranges from 5.5 .ANG. to 7.0 .ANG.. The use of these shape selective catalysts results in a diisopropylnaphthalene stream which is enhanced in .beta. isomers and enhanced in the desired 2,6-diisopropylnaphthalene isomer. A particularly preferred catalyst is synthetic Mordenite. Specific catalyst modifications are also described to improve selectivity to the desired 2,6-diisopropylnaphthalene isomer.

Process for selective diisopropylation of naphthyl compounds using shape

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Livermore, CA, United States of America

Jere D Fellman