1,1'-Biphenyl-4-yl-boronic acid → 2,2',4,4',7,7'-Hexabiphenylyl-9,9'-spirobifluorene

HRID 8548Notes

Reaction equation

HRID 8548 reaction equation
Br[C:2]1[CH:14]=[C:13]2[C:5]([C:6]3[C:11](=[CH:12]2)[C:10]2([C:26]4[C:18]([C:19]5[C:24]([CH:25]=4)=[CH:23][CH:22]=[CH:21][CH:20]=5)=[CH:17][CH:16]=[CH:15]2)[C:9](Br)=[C:8](Br)[C:7]=3Br)=[C:4](Br)[C:3]=1Br.B(O)(O)[C:33]1[CH:34]=[CH:35][C:36]([C:39]2[CH:40]=[CH:41][CH:42]=[CH:43][CH:44]=2)=[CH:37][CH:38]=1>C1(C)C=CC=CC=1.C(=O)([O-])[O-].[K+].[K+].C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:36]1([C:39]2[CH:40]=[CH:41][CH:42]=[CH:43][CH:44]=2)[CH:35]=[CH:34][CH:33]=[CH:38][C:37]=1[C:2]1[CH:14]=[C:13]([C:12]2[CH:25]=[CH:26][CH:18]=[CH:17][C:11]=2[C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)[C:5]2[C:6]3[C:15](=[CH:10][C:9]([C:40]4[CH:41]=[CH:42][CH:43]=[CH:44][C:39]=4[C:36]4[CH:37]=[CH:38][CH:33]=[CH:34][CH:35]=4)=[CH:8][CH:7]=3)[C:16]3([C:17]4[CH:18]=[C:26]([C:40]5[CH:41]=[CH:42][CH:43]=[CH:44][C:39]=5[C:36]5[CH:37]=[CH:38][CH:33]=[CH:34][CH:35]=5)[CH:25]=[C:24]([C:23]5[CH:22]=[CH:21][CH:20]=[CH:16][C:15]=5[C:10]5[CH:11]=[CH:6][CH:7]=[CH:8][CH:9]=5)[C:19]=4[C:42]4[C:41]3=[CH:40][C:39]([C:36]3[CH:37]=[CH:38][CH:33]=[CH:34][C:35]=3[C:13]3[CH:14]=[CH:2][CH:3]=[CH:4][CH:5]=3)=[CH:44][CH:43]=4)[C:4]=2[CH:3]=1

Participants

6

Reactant 2

HCID 1512531,1'-Biphenyl-4-yl-boronic acidHCID 86753354Hexabromospirobifluorene

Product 1

HCID 220160562,2',4,4',7,7'-Hexabiphenylyl-9,9'-spirobifluorene

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 1140TolueneSolvent2×HCID 11430Potassium CarbonateSolvent

Procedure

In a 250 ml two-necked flask fitted with reflux condenser and precision glass stirrer, 1.6 g of hexabromospirobifluorene and 3 g of biphenylboronic acid are slurried in a mixture of 50 ml of toluene and 50 ml of 1 M potassium carbonate solution. The mixture is refluxed under nitrogen and 115 mg of tetrakis(triphenylphosphine)palladium in 5 ml of toluene are added. The mixture is boiled under reflux for 7 hours while stirring. After the reaction is complete, the cooled solution is filtered and the filtrate is extracted twice by shaking with water (to improve the phase separation, chloroform is added). The organic phase is dried over sodium sulfate, filtered through a short column of silica gel and subsequently evaporated on a rotary evaporator. The product is further purified by recrystallization from dichloromethane/pentane. This gives 2 g (80%) of colorless crystals which fluoresce blue under UV illumination.

Workup

  1. customIn a 250 ml two-necked flask fitted
  2. temperaturewith reflux condenser and precision glass stirrer
  3. temperatureThe mixture is refluxed under nitrogen
  4. temperatureunder reflux for 7 hours
  5. filtrationthe cooled solution is filtered
  6. extractionthe filtrate is extracted twice
  7. stirringby shaking with water (
  8. customthe phase separation, chloroform
  9. additionis added)
  10. dry with materialThe organic phase is dried over sodium sulfate
  11. filtrationfiltered through a short column of silica gel
  12. customsubsequently evaporated on a rotary evaporator
  13. customThe product is further purified by recrystallization from dichloromethane/pentane

Sources & evidence

ORD record
ord-e9b74b1543024f7095957018614387c0
Source dataset
uspto-grants-2006_08
Patent number
US07088757B1

Reaction notes

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