Benzyl alcohol can be formed from benzaldehyde by means of hydrogenation. The molecule is structurally related to other aromatic aldehydes such as benzaldehyde and vanillin. Benzoin is synthesized from benzaldehyde in the benzoin condensation. The aniline dye malachite green is prepared from benzaldehyde and dimethylaniline. For example, the asymmetric addition of an ethyl group to benzaldehyde and imines. Benzoin is prepared from benzaldehyde via the benzoin condensation. The archetypical reaction is that of the silyl enol ether of cyclohexanone with benzaldehyde. The solution cannot differentiate between benzaldehyde and acetone. Mandelonitrile, however, dissociates to benzaldehyde and hydrogen cyanide, and cannot be stabilized by glycosylation. For example, the addition of diethyl malonate into benzaldehyde would produce only one product. Synthesis from benzylidene chloride, prepared from benzaldehyde and phosphorus pentachloride, is used as well. In the classic application benzaldehyde is converted to benzoin. In one such example, a Knoevenagel condensation of benzaldehyde with nitroethane yields . It was first prepared by treatment of benzaldehyde with chlorine. A small amount of benzaldehyde solution is placed on a fume board near the honeycombs.