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Your search keyword '"Brown, George"' showing total 47 results
Start Over Author "Brown, George" Journal journal of the american chemical society
47 results on '"Brown, George"'

1. Constitutional and translational isomerism in (2)catenanes and (n)pseudorotaxanes

Author

Amabilino, David B., Anelli, Pier-Lucio, Ashton, Peter R., Brown, George R., Cordova, Emilio, Godinez, Luis A., Hayes, Wayne, Kaifer, Angel E., Philp, Douglas, Slawin, Alexander M.Z., Spencer, Neil, Stoddart, J. Fraser, Tolley, Malcolm S., and Williams, David J.

Subjects
Isomerism -- Research, Catenanes -- Research, Chemistry
Abstract

Self-assembly is a suitable procedure for the formation of nanometer-scale molecular and supramolecular structure involving the selection of efficient building blocks. The position of pi-electron rich and pi-electron deficient structural substrates have significant influence on the organization of the self-assemblies. The translational and constitutional isomerism in (2)catenanes and (n)pseudorotaxanes is analyzed by X-ray crystallography, fast-atom bombardment mass spectroscopy and 1H and 13C nuclear magnetic spectroscopy.

Published
1995

2. Substrate-directed synthesis via stereoregular Diels-Alder oligomerizations

Author

Ashton, Peter R., Brown, George R., Isaacs, Neil S., Giuffrida, Danielle, Kohnke, Franz H., Mathias, John P., Slawin, Alexandra M.Z., Smith, Diane R., Stoddart, J. Fraser, and Williams, David J.

Subjects
Cyclic compounds -- Research, Diels-Alder reaction -- Research, Ring formation (Chemistry) -- Research, Chemistry
Abstract

Stereoregular Diels-Alder reactions can be applied in substrate-directed synthetic strategies to successfully prepare polyacene and cyclacene derivatives in good yields. Moreover, this synthetic approach can be employed in the diastereoselective formation of structurally complex products from bisdiene and bisdienophilic building blocks. The Diels-Alder oligomerizations do not exhibit any reversibility which proves that the treble diastereoselectivity of the reaction originates from the involved transition states. In addition, the macropolycyclic compounds that are formed can serve as precursors for the synthesis of different hydrocarbon structures.

Published
1992

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