Dichloromethane → Tributyltin fluoride

Participants

Reaction Conditions

Reaction Steps

Step a) Under inert atmosphere, to a mixture of chromophore 1, 1 mol % catalysator Pd(PPh3)4, 1 equivalent of CsF in toluene, 1.2 equivalent of tributylstannyl-thiophene were added. The reaction mixture was stirred at 120° C. for 12 h. After cooling to room temperature, dichloromethane was added. The white salt (Bu3SnF) formed during the reaction was filtered off and the solvent removed under reduced pressure. Purification of the crude product was performed by column chromatography on silica gel with (4/6) dichloromethane/ethylacetate to give the pure thiophene derived squarylium dye 3.

Provenance & Evidence