in tetrahydrofuran byproducts: Co(CO)4(1-); soln. of the Co-complex was gradually warmed from -40°C to room temp. in 2 h under Ar atmosphere; reaction mixt. was analyzed by IR spectroscopy and gas chromy.; GC yield of dimethyl malonate 9.5percent (from the two stages);

in tetrahydrofuran byproducts: Co(CO)4(1-); soln. of the Co-complex was gradually warmed from -40°C to room temp. in 2 h under Ar atmosphere; reaction mixt. was analyzed by IR spectroscopy and gas chromy.; GC yield of dimethyl malonate 9.5percent (from the two stages);

in tetrahydrofuran byproducts: Co(CO)4(1-); soln. of the Co-complex was gradually warmed from -40°C to room temp. in 2 h under Ar atmosphere; reaction mixt. was analyzed by IR spectroscopy and gas chromy.; GC yield of dimethyl malonate 9.5percent (from the two stages);

in tetrahydrofuran byproducts: Co(CO)4(1-); soln. of the Co-complex was gradually warmed from -40°C to room temp. in 2 h under Ar atmosphere; reaction mixt. was analyzed by IR spectroscopy and gas chromy.; GC yield of dimethyl malonate 9.5percent (from the two stages);

in tetrahydrofuran byproducts: Co(CO)4(1-); soln. of the Co-complex was gradually warmed from -40°C to room temp. in 2 h under Ar atmosphere; reaction mixt. was analyzed by IR spectroscopy and gas chromy.; GC yield of dimethyl malonate 9.5percent (from the two stages);