Organometallic fluoro complexes

Fluoride complexes of organometallics can be readily prepared by halide abstraction reactions. The general reaction scheme for a carbonyl species  

Fluoroanions such as [BF4] , [PF6]-, and [AsF6] can be considered as potential sources of fluoride ions. The silver salts tend to be wet and abstraction reactions lead to hydrolysis3 (see the procedure in Section C) or yield either the aqua or fluoroanion complexes ([BF4] or [AsF6] , 4 Using dry reagents such as NO[PF6] can lead to the oxidative addition of fluoride (see the procedure in Section D).5 

Silver fluoride is prepared by slowly dissolving excess silver oxide in hydrofluoric acid (50%) over 24 h. The filtered solution is evaporated to dryness in vacuo at 35 °C and then heated to 60 °C for 1 h. The yellow solid as stored over P205 away from light and powdered before use. 

A mixture of Re(CO)5Br dissolved in 8 mL of fluorobenzene and finely divided and freshly prepared silver fluoride (30 mg, 0.24 mmol, two-fold excess) is stirred in a glass vessel at room temperature for 2 h. The solution is filtered to remove the precipitated silver bromide and excess silver fluoride. The filtrate is heated to reflux at 90 to 100°C for 5 h, cooled to room temperature, and the solvent is removed under vacuum to give the yellow product. Yield 44 mg, 0.036 mmol (75% yield). This can be recrystallized from a diethyl ether solution into which fluorobenzene is allowed to diffuse and dried in vacuo to give needle or prismatic crystals. 

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Other Names Boron, [5-[(3,5-dimethyl-2//-pyrrol-2-ylidene)methyl] -N- [2-hydroxy-1 - (hydroxymethyl)- 3 -heptadecenyl]-l//-pyrrole-2-pentanamidato-M,A5]di-fluoro-, [T-4-[i -[i , 5 -( )]]]- Boron, [5-[(3,5-dimethyl-2//-pyrrol-2-ylidene-KA0methyl]-Al-[(15,2f ,3 )-2-hy-droxy-1 -(hydroxymethyl)-3-heptadecenyl]- l//-pyrrole-2-pentanamidato-KAl]difluoro-, (T-4)- 17f-Pyrrole-2-pentanamide, 5-[(3,5-dimethyl-2/f-pyrrol-2-ylidene) methyl]-A- [2-hydroxy-1 -(hydroxymethyl)-3-heptadece-nyl]-, horon complex, [/ -[/ , 5 -( )]]- BODIPY FL-C5-ceramide Cs-DMB-ceramide Merck Index Number Not listed Chemical/Dye Class Organometallic, boron based... 

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