methanol; carbon monoxide in methanol; benzene addn. of CAN to soln. of cumulene complex in alcohol and benzene, bubbling of CO, stirred for 4h at room temp.; diln with H2O, extn. (Et2O), chromy. (silica gel);

carbon monoxide; water in water; acetonitrile; benzene addn. of CAN to soln. of cumulene complex in alcohol and benzene, bubbling of CO, stirred for 4h at room temp.; diln with H2O, extn. (Et2O), chromy. (silica gel);