Process for producing mandelonitrile compound
A process for producing a mandelonitrile compound represented by the following formula (2), comprising a step of reacting a benzaldehyde compound represented by the following formula (1) with at least one member selected from the group consisting of metal cyanides and hydrogen cyanide in the presence of a phase transfer catalyst in a solvent.
1. A process for producing a mandelonitrile compound represented by formula (2):
wherein Q represents an optionally substituted phenyl group X represents a hydrogen atom, M represents an oxy group (—O—), and n represents 1,
comprising a step of reacting a benzaldehyde compound represented by formula (1):
wherein Q, X, M and n are each as described above,
with at least one member selected from the group consisting of metal cyanides in the presence of a phase transfer catalyst in a solvent containing an alcohol.
2. The process according to claim 1 , wherein the solvent is a mixed solvent composed of water, an alcohol and at least one member selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons and halogenated hydrocarbons.
3. The process according to claim 2 , wherein the solvent is one adjusted to pH 6 to 8.
4. The process according to claim 3 , wherein the solvent is one adjusted to pH 6 to 8 by mixing with acetic acid or hydrochloric acid.
5. The process according to claim 1 , wherein the phase transfer catalyst is a quaternary ammonium salt, a quaternary phosphonium salt or a crown ether.
6. The process according to claim 1 , wherein the phase transfer catalyst is at least one member selected from the group consisting of tetra-n-butylammonium bromide, benzyltriethylammonium chloride and methyltributylammonium chloride.
7. The process according to claim 1 , wherein the use amount of the at least one member selected from the group consisting of metal cyanides is in the range of 1.2 mole to 3.0 mole with respect to 1 mole of the benzaldehyde compound represented by formula (1).
8. A process for producing a mandelonitrile compound represented by formula (2):
wherein Q represents an optionally substituted phenyl group X represents a hydrogen atom, M represents an oxy group (—O—), and n represents 1,
comprising a mixing step of mixing a benzaldehyde compound represented by formula (1):
wherein Q, X, M and n are each as described above,
at least one member selected from the group consisting of metal cyanides, a phase transfer catalyst, at least one member selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons and halogenated hydrocarbons, water, and an alcohol, and a step of adding an acid to the mixed liquid obtained in said mixing step, thereby maintaining the pH of the aqueous layer of the mixed liquid at 6 to 8.
9. The process according to claim 8 , wherein the acid is acetic acid or hydrochloric acid.
10. The process according to claim 8 , wherein the phase transfer catalyst is a quaternary ammonium salt.
11. The process according to claim 8 , wherein the phase transfer catalyst is at least one member selected from the group consisting of tetra-n-butylammonium bromide, benzyltriethylammonium chloride and methyltributylammonium chloride.