The Preparation, Alcoholysis and Reduction of Cyanoacetaldehyde Diethylacetal. Malonaldehyde Tetraethylacetal xov,. 1 CY. 4NOACETALDEHYDE DIETHYLACETAL AND MALONALDEHYDE TETRAETHYLACETAL 2657 higher boiling material and 30.0 g. of undistillable residue. The high boiling material despite repeated fractional distillations did not yield fractions with constant refractive indices. Thus there was obtained in all 111.6 g. ...