Triphenylmethane → 2-(8-Phenylocta-1,7-diyn-1-yl)benzaldehyde

Temperature

0 °C

A solution of 5-hexynyl alcohol (102 mmoles) in pyridine (150 ml), under argon, was cooled to 0° C. and p-toluenesulfonyl chloride (204 mmoles) was added. The reaction mixture was kept at about 4° C. for 18 hours, poured into ice-water and then taken up in ether. The ether extract was washed with cold 10% hydrochloric acid, water and brine. The organic layer was dried and concentrated in vacuo to give 5-hexynyl p-toluenesulfonate. A solution of phenylacetylene (97 mmoles) in tetrahydrofuran (200 ml) containing a trace of triphenylmethane was cooled to 0° C. and then n-butyl lithium (37.3 ml of 2.6 moles in hexane) was added dropwise. The resulting solution was stirred at 0° C. for 10 minutes and hexamethylpho-sphoramide (21 ml) was added dropwise. After stirring for 10 minutes a solution of 5 hexynyl p-toluenesulfonate (97.1 mmoles) in tetrahydrofuran (200 ml) was added. The reaction mixture was stirred at room temperature for 18 hours, diluted with ether and the organic layer was washed with water and brine. The dried organic solution was concentrated and the product was purified by flash chromatography to qive 1 phenylocta-1,7-diyne. A mixture of this compound (43 mmoles), 2-bromobenzaldehyde (35.8 mmoles), cuprous iodide (0.5 mmoles) and bis(triphenylphosphine) palladium (II) chloride (0.7 mmoles) in triethylamine (100 ml) was heated in an oil bath (95° C.) for one hour. The reaction mixture was cooled to 0° C., filtered and the filtrate was concentrated. The residue was dissolved in ether, washed with 10% hydrochloric acid, water and brine. The organic layer was dried and concentrated to give a product which was purified by flash chromatography to yield 2-(8-phenyl-1,7-octadiynyl)benzaldehyde. A solution of this compound (24 1 mmoles) in ethyl acetate (100 ml) and 10% palladium on charcoal (1 g) was hydrogenated (40 psi of hydroqen) at room temperature for 15 minutes. The catalyst was filtered off and the filtrate concentrated to give the 2-(8-phenyloctyl)benzaldehyde.

1. additionwas added
2. stirringThe reaction mixture was stirred at room temperature for 18 hours
3. washthe organic layer was washed with water and brine
4. concentrationThe dried organic solution was concentrated
5. customthe product was purified by flash chromatography
6. temperaturewas heated in an oil bath (95° C.) for one hour
7. temperatureThe reaction mixture was cooled to 0° C.
8. filtrationfiltered
9. concentrationthe filtrate was concentrated
10. dissolutionThe residue was dissolved in ether
11. washwashed with 10% hydrochloric acid, water and brine
12. customThe organic layer was dried
13. concentrationconcentrated
14. customto give a product which
15. customwas purified by flash chromatography

ORD record

ord-fa4d4e366eac4c0f8a04ed41b5129ebe

Source dataset

uspto-grants-1990_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04954513