Triethylamine → 4-Cyanobenzonitrile oxide

Temperature

-5 °C

To a 300 ml, three-necked, round bottomed flask equipped with a magnetic stirrer, a thermometer, and a 125 ml dropping funnel topped with a drying tube was added triethylamine (6.1 g, 60 mmoles) and ether (150 ml). The solution was cooled to -5°C in an ice/salt bath and a solution of terephthalhydroximoyl chloride (4.7 g, 20 mmoles) in ether (75 ml) was added dropwise at -5°C with rapid stirring over a period of 20 minutes. The resulting white suspension was stirred an additional 40 minutes at -5°C. Cold distilled water (30 ml) was then added and the suspension was stirred an additional 20 minutes at 0°to -5°C and was then filtered on a sintered glass filter. The nearly white solid was washed thoroughly on the filter with cold distilled water (3 × 25 ml) and cold ether (3 ×0 25 ml) and was then dried in a vacuum desiccator for 2 1/4hours (0.7 mm Hg) to yield 3.1 g (95%) of nearly white, fluffy terephthalonitrile oxide (TPNO). (As a word of caution, the dry material decomposed explosively when heated to 155°C in air).

1. customTo a 300 ml, three-necked, round bottomed flask equipped with a magnetic stirrer
2. customtopped with a drying tube
3. stirringThe resulting white suspension was stirred an additional 40 minutes at -5°C
4. distillationCold distilled water (30 ml)
5. additionwas then added
6. stirringthe suspension was stirred an additional 20 minutes at 0°to -5°C
7. filtrationwas then filtered on a sintered glass
8. filtrationfilter
9. washThe nearly white solid was washed thoroughly on the
10. filtrationfilter
11. distillationwith cold distilled water (3 × 25 ml) and cold ether (3 ×0 25 ml)
12. customwas then dried in a vacuum desiccator for 2 1/4hours (0.7 mm Hg)

ORD record

ord-afae2b521f1c45249fbbb5425432a3c8

Source dataset

uspto-grants-1976_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US03960814