4 The reaction takes place exothermically with the evolution of hydrogen cyanide at room temperature to give 4. In a rep- resentative procedure dimethyldicyanosilane (12 mmol) is dissolved in dichloromethane (3 mL) and the solution is cooled to -40 “C. The @-diketone (10 mmol) is slowly added to the solution by a hypodermic syringe, and the mixture is allowed to warm to room temperature over 1 h. After removal of hy- drogen cyanide and the solvent, purification is effected by ...
![[cyano(dimethyl)silyl]formonitrile Structure](https://image.chemsrc.com/caspic/402/5158-09-8.png)
