| Fluorenylmethyloxycarbonyl chloride[1] | |
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Chloroformic acid 9H-fluoren-9-ylmethyl ester |
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Other names
9-Fluorenylmethyl chloroformate; 9-Fluorenylmethoxycarbonyl chloride; Fmoc-chloride |
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| Identifiers | |
| CAS number | 28920-43-6 |
| PubChem | 34367 |
| ChemSpider | 31647 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | C15H11ClO2 |
| Molar mass | 258.7 g mol−1 |
| Melting point |
62-64 °C |
| Hazards | |
| EU classification | Corrosive (C) |
| R-phrases | R34 |
| S-phrases | S26 S36/37/39 S45 |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Fluorenylmethyloxycarbonyl chloride (FMOC-Cl) is a chloroformate ester. It is used to introduce FMOC group as the FMOC carbamate.
This compound may be prepared by reacting 9-fluorenylmethanol with phosgene:[2]
The FMOC carbamate is often used as a protecting group for amines. The FMOC group can be introduced by reacting the amine with FMOC-Cl, e.g.:[3]
The other common method for introducing the FMOC group is through 9-fluorenylmethyl succinimidyl carbonate (FMOC-OSu), which may itself be obtained by the reaction of FMOC-Cl with the dicyclohexylammonium salt of N-hydroxysuccinimide.[4]
It may be cleaved by bases, typically a solution of piperidine:
FMOC protection has found significant use in solid phase peptide synthesis because its removal with piperidine solution does not disturb the acid labile linker between the peptide and the resin.[5]
Because the fluorenyl group is highly fluorescent, certain UV-inactive compounds may be reacted to give the FMOC derivatives, suitable for analysis by reversed phase HPLC. Analytical uses of FMOC-Cl that do not use chromatography may be limited by the requirement that excess FMOC-Cl be removed before an analysis of fluorescence.