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. 2014 Dec 8;19(12):20536–20556. doi: 10.3390/molecules191220536

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© 2014 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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Prominent Si-¹⁸F, B-¹⁸F, and Al-¹⁸F building blocks used for direct labeling of peptides with F-18 (Si-¹⁸F building blocks: aldehyde (top) and maleimide (bottom) derivative of the di-tert-butyl-modified silicon fluoride acceptor species; B-¹⁸F building blocks:aryltrifluoroborate (top) and alkylammoniomethyltrifluoroborate (bottom); Al-¹⁸F building blocks: S-2-(4-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid species (top) and 1,4,7-triazacyclononane-1,4-diacetic acid-methylphenylacetic acid derivative (bottom)).