Hydrochloric Acid → 4-Cyanophenylboronic acid

A solution of 10.0 g (54.9 mmol) of 4-bromobenzonitrile in 100 mL of tetrahydrofuran was cooled to −85° C. whereupon 36.0 mL (57.6 mmol) of 1.6 M solution of n-butyllithium in hexane was added. The mixture was stirred for five minutes and 19.0 mL (82.4 mmol) of triisopropylborate was added. The mixture was stirred at −85° C. for 30 minutes then warmed to ambient temperature over one hour. To the mixture was added 35 mL of 5 N hydrochloric acid and stirring was continued for 2.5 hours. The mixture was diluted with 100 mL of saturated aqueous sodium chloride and extracted three times with 100 mL each of ethyl ether. The combined organics were dried (MgSO4), filtered and concentrated in vacuo. The residue was recrystallized from water and filtered to afford 2.0 g (25%) of the title compound.

1. additionwas added
2. stirringThe mixture was stirred at −85° C. for 30 minutes
3. stirringstirring
4. waitwas continued for 2.5 hours
5. extractionextracted three times with 100 mL each of ethyl ether
6. dry with materialThe combined organics were dried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was recrystallized from water
10. filtrationfiltered

ORD record

ord-cedd9712f5bf4b39bbd12b4a8be93b9d

Source dataset

uspto-grants-2003_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06525099B1