in further solvent(s) byproducts: MeOH; reflux for 2 h, in i-C4H9OH; soln. was concd. in vac., solid was recrystd. from CH2Cl2-petroleum ether (30-60 °C) (1:1, v/v), elem. anal.;

in diethyl ether treating of soln. of SnCl2 and acrylic ester with HCl; elem. anal.;