Ammonia → HCID 13127496, compound

2-Chloro-4-ethylaniline [14.5 g.; described by K. Altau, J. Chem. Eng. Data, 8, 122 (1963)] was dissolved, with stirring, in glacial acetic acid (113 ml). A solution of sodium nitrite (7.0 g) in concentrated sulphuric acid (55 ml) was then added at 55°-60° C. The solution thus obtained was cooled to 0°-5° C. and a solution of stannous chloride (70 g) in concentrated hydrochloric acid (80 ml) was added with vigorous stirring. A cream-coloured solid precipitated. The mixture was filtered and the solid obtained was added to a mixture of aqueous ammonia and ice. The mixture thus obtained was extracted with diethyl ether (4×300 ml) and the combined ethereal extracts were dried over sodium sulphate, filtered and evaporated to dryness, to give 2-chloro-4-ethylphenylhydrazine (9.6 g), m.p. 55°-57° C., in the form of a cream-coloured solid. By proceeding in a similar manner, but replacing the 2-chloro-4-ethylaniline by the hereinafter indicated appropriately substituted aniline, there was prepared:

1. customThe solution thus obtained
2. temperaturewas cooled to 0°-5° C.
3. customA cream-coloured solid precipitated
4. filtrationThe mixture was filtered
5. customthe solid obtained
6. customThe mixture thus obtained
7. extractionwas extracted with diethyl ether (4×300 ml)
8. dry with materialthe combined ethereal extracts were dried over sodium sulphate
9. filtrationfiltered
10. customevaporated to dryness

ORD record

ord-39a96e0170024192b2b42e3e90b8351e

Source dataset

uspto-grants-1984_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04459150