Substrate scope for Cu-catalyzed cyanosilylation of substituted benzaldehydes with TMSCN^a.

Entry	Substituted benzaldehyde (R-C6H4CHO)	Product yieldb (%)
1	R = H	96
2	R = 2-NO2	98
3	R = 3-NO2	>99
4	R = 4-NO2	>99
5	R = 4-Cl	94
6	R = 4-OH	61
7	R = 4-CH3	56
8	R = 4-OCH3	27

^aConditions: aldehyde (0.5 mmol), TMSCN (1.0 mmol), catalyst 1 (3.0 mol%), CH₂Cl₂ (2.5 mL), 35 °C.

^bYield on the basis of ¹H NMR analysis: [moles of product per mol of aldehyde substrate] × 100%.