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55135-66-5 - 9-Bromo-9-phenylfluorene, 96% - L14225 - Alfa Aesar

L14225 9-Bromo-9-phenylfluorene, 96%

Codice CAS
55135-66-5
Sinonimi

Dimensioni Prezzo ($) Quantità Disponibilità
1g 42,70
5g 127,00
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9-Bromo-9-phenylfluorene, 96%

MDL
MFCD00075522
EINECS
000-000-0

Proprietà chimiche

Formula
C19H13Br
Peso formula
321.23
Punto di fusione
94-99°

Letteratura

Reagent for protection of amines as their N-9-phenylfluorenyl (Pf) derivatives, which are ca 6000x more stable than trityl (Trt) groups (see Chlorotriphenyl­methane, A11799) to acid hydrolysis: J. Chem. Soc., 1895 (1964), and have been found useful in asymmetric syntheses. The group has been introduced using K3PO4 or Et3N as base and Pb(NO3)2 as a bromide scavenger: J. Org. Chem., 50, 1239 (1985); 51, 3882 (1986). An alternative lead-free method uses K3PO4 and nitromethane: J. Org. Chem., 58, 2369 (1993). The Pf group can be cleaved with TFA in acetonitrile. For examples and discussion, see: Org. Synth. Coll., 9, 344 (1998). Hydrogenolysis: J. Org. Chem., 60, 4602 (1995); 61, 9437 (1996), or Li/ammonia reduction: J. Org. Chem., 55, 3511 (1990) have also been reported. N-Pf- and N-Trt- derivatives of amino acids have also been converted to Leuchs' anhydrides by treatment with phosgene or triphosgene, and the products coupled with amino acid esters to give dipeptides in good yields without racemization: J. Org. Chem., 64, 2532 (1999).

/n

The Pf ester has also been developed for protection of the -carboxy group of glutamic acid in peptide synthesis, with better stability than trityl, but readily cleaved by TFA in DCM: Synlett, 1136 (1999).

/n

Rischio GHS e dichiarazioni precauzionali

Dichiarazioni di rischio (UE): H314-H318

Causes severe skin burns and eye damage. Causes serious eye damage.

Dichiarazioni precauzionali: P260u-P201-P280i-P304+P340-P405-P501a

Obtain special instructions before use. Wear eye/face protection. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.

Altri riferimenti

Beilstein
2561445
Classe di rischio
8
Gruppo di imballaggio
II
Codice tariffe armonizzato
2903.99
TSCA
No

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