Hydroxyamine hydrochloride → (NE)-N-(5-ethenyl-2,3-dihydroinden-1-ylidene)hydroxylamine

Temperatur

60 °C

To a mixture of 5-vinyl-2,3-dihydro-1H-inden-1-one (Preparation 87A, 1.05 g, 6.64 mmol), hydroxylamine hydrochloride (0.553 g, 7.96 mmol) and methanol (20 mL) at room temperature was added sodium acetate (0.653 g, 7.96 mmol). The reaction mixture was stirred at 60° C. for 1 hr and at room temperature overnight. The heterogeneous mixture was concentrated and water (20 mL) was added. The mixture was heated to ˜60° C. and then cooled. The solid was filtered, washed with a mixture of water and ethanol (1:1) and dried to give (E)-5-vinyl-2,3-dihydro-1H-inden-1-one oxime (1.13 g, 6.52 mmol, 98% yield) as a yellow solid. The product had an HPLC ret. time=2.72 min. (condition C); LC/MS M+1=174.3.

1. concentrationThe heterogeneous mixture was concentrated
2. additionwater (20 mL) was added
3. temperatureThe mixture was heated to ˜60° C.
4. temperaturecooled
5. filtrationThe solid was filtered
6. washwashed with a mixture of water and ethanol (1:1)
7. customdried

ORD-Eintrag

ord-f1f2da92fcdc417f899b54e66246744d

Quelldatensatz

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09216972B2