“…The reaction mixture was extracted with 100 ml of ether. From this solution were isolated 0.05 g of l,l-dicyano-2-7V,7V-dimethylaminoethylene (11) and 0.25 g of 1 -, -dimethylamino-1 -cyano-2-methylpropane (13) (containing a very small amount of 11). Distillation of 13 gave a pure sample: bp 60°( 25 mm) [lit.21 54°( 1 mm)]; ir (NaCl neat) 2815, 2770 (Me2N-), 2240 and 2220 (vw, C=N); nmr (CDCI3) 6.9-7.15 (two d, 1 FI a to C=N and Me2N), 7.72 (s, 6 H, Me2N), 7.87-8.40 (m, 1 a to the 2 Me), 8.83-9.07 (two d, Me a to C-H); from the nmr spectrum, it seems there were two rotational isomers; mass spectrum (m/e, %) •+ (126, 52), •+ -HCN (99, 21), M-+ -CH2=N-Me (83, 100).…”