in neat (no solvent) byproducts: trimethyltin malonate; equimolar mixt. of educts, 96h, 200°C, ampoule, acidolysis by addn. of malonic acid in ether, reflux, 48h, ether removed, pptn. of malonate by addn. of pentane, under Ar, further products; ratio of educts I:II:III:IV:VII:VIII=8:6:6:10:46:9, total yield of mixt.: 18percent, alcohols detected by chromy. and silylation followed by IR;

in neat (no solvent) byproducts: tributyltin malonate; equimolar mixt. of educts, stirred, 96h, 200°C, distn. under reduced press., acidolysis by addn. of malonic acid in ether, reflux, 48h, ether removed, pptn. of malonate by addn. of pentane, under Ar, further products; ratio of educts I:II:III:IV:VII:VIII=12:12:9:18:34:11, total yield of mixt.: 17percent, alcohols detected by chromy. and silylation followed by IR;