[xshadow]

Hi , in an exercise I have benzaldehyde +Ni raney

I don't know the product  exactly...
I know that:

Ni raney can reduce benzene
Ni can reduce also ketones and aldehydes


Here I have a benzenic ring + an aldehyde group
Will Ni raney reduce both ??

Thanks!!

[AWK]

Raney nickel does not reduce any compound. It is a catalyst that may transfer hydrogen to organic molecules from elementary hydrogen or from hydrogen-rich compounds.
Which compounds may form during reduction depends on the reaction conditions.

[xshadow]

Yes,was Ni +H₂

An exercise says benzaldehyde + H₂/Ni raney


I don't know if both benzilic ring reduction and carbonyl reduction happen

[AWK]

The pressure of H₂ and temperature of reaction are very important parameters.

[xshadow]

The pressure of H₂ and temperature of reaction are very important parameters.

Do I need High temperature and pressure in order to reduce the benzylic ring?

If mild/moderate condition I'll reduce only the  C=O of aldehyde?

But with high temperature both benzylic ring (less reactive) and C=O group (more reactive)

Thanks!

[AWK]

~100°C is sufficient for reduction of phenyl ring.

[xshadow]

Thanks..