Stannous chloride dihydrate → HCID 18944276, compound

Temperature

-10 °C

A solution of NaNO2 (80 g, 1.16 mol) was added dropwise to a cooled (-10° C.), stirred, suspension of 4-aminobenzyl cyanide (153.5 g, 1.16 mol) in concentrated HCl (1500 ml), at such a rate that the temperature did not rise above -10° C. The mixture was stirred at -10° C. for 0.25 h before being filtered rapidly under vacuum into an addition funnel. The solution was added portionwise over a 0.25 h period to a rapidly stirred mixture of SnCl2.2H2O (1.05 kg, 4.64 mol) in concentrated HCl (800 ml) keeping the temperature below -5° C. The mixture was allowed to warm to room temperature and stir for 0.25 h before filtering the sandy coloured precipitate under vacuum and washing with ether (5×500 ml). The resultant solid was dried over P2O5 in a vacuum oven (80° C.) for 16 h to give the title compound (213 g, 100%), m.p. 181°-183° C.; 1H NMR (360 MHz, D2O) δ 3.90 (2H, s, CH2); 7.06 (2H, d, J=8.7 Hz, Ar-H); 7.40 (2H, d, J=8.7 Hz, Ar-H).

1. customdid not rise above -10° C
2. stirringThe mixture was stirred at -10° C. for 0.25 h
3. filtrationbefore being filtered rapidly under vacuum into an addition funnel
4. customthe temperature below -5° C
5. temperatureto warm to room temperature
6. stirringstir for 0.25 h
7. filtrationbefore filtering the sandy coloured precipitate under vacuum
8. washwashing with ether (5×500 ml)
9. dry with materialThe resultant solid was dried over P2O5 in a vacuum oven (80° C.) for 16 h

ORD record

ord-044b04b1068f46b08e1a8a5f08e03a7e

Source dataset

uspto-grants-1994_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05298520