Use of compositions obtained by calcining particular metal-accumulating plants for implementing catalytical reactions

A method of preparation of a composition containing at least one metal catalyst the metal of which is one of the aforesaid metals originating from a calcined plant or calcined plant part having accumulated at least one metal chosen in particular from zinc (Zn), nickel (Ni) or copper (Cu), for the implementation of organic synthesis reactions involving said catalyst characterised in that the metal accumulating plant is chosen from the genus Alyssum, such as Alyssum murale, Alyssum fallacinum, Alyssum lesbiacum, Alyssun serpyllifolium, Alyssum bertolonii, the genus Noccaea, such as:

• Noccaea ochrleuca, Noccaea goesingense, Noccacea caerulescens, the genus Geissois, such as:
• Geissois pruinosa, the genus Psychotria, such as:
• Psychotria douarrei, Psychotria costivenia, Psychotria clementis, Psychotria vanhermanii, the genus Pcynandra such as Pycnandra acuminata (or Sebertia acuminata), the genus Anisopappus such as Anisopappus chinensis, Anisopappus davyi, the genus Phyllanthus such as P. balgooyi Phyllantthus serpentinus, Phyllanthus ngoyensis, the genus Homalium such as Homalium kanaliense, Homalium guillainii, the genus hybanthus such as Hybanthus austrocaledonicus, the genus Anisopappus such as Anisopappus chinensis, Anisopappus davyi, Centaurium erythraea, Bacopa monnieri, Anthyllis vulneraria.

A catalytic composition prepared from a calcined plant or calcined plant part having accumulated at least one metal chosen in particular from zinc (Zn), nickel (Ni) or copper (Cu), and containing at least one metal catalyst the metal of which is one of the aforesaid metals originating from said plant for the implementation of organic synthesis reactions involving said catalyst, wherein the metal accumulating plant is chosen from the genus Alyssum, such as Alyssum murale, Alyssum fallacinum, Alyssum lesbiacum, Alyssun serpyllifolium, Alyssum bertolonii, the genus Noccaea, such as:

• Noccaea ochrleuca, Noccaea goesingense, Noccacea caerulescens, the genus Geissois, such as:
• Geissois pruinosa, Psychotria costivenia, Psychotria clementis, Psychotria vanhermanii, the genus Pcynandra such as Pycnandra acuminata (or Sebertia acuminata), the genus Anisopappus such as Anisopappus chinensis, Anisopappus davyi, the genus Psychotria, such as:
• Psychotria douarrei, the genus Phyllanthus such as P. balgooyi Phyllantthus serpentinus, Phyllanthus ngoyensis, the genus Homalium such as Homalium kanaliense, Homalium guillainii, the genus hybanthus such as Hybanthus austrocaledonicus, the genus Anisopappus such as Anisopappus chinensis, Anisopappus davyi. Centaurium erythraea, Bacopa monnieri, Anthyllis vulneraria.

Composition containing at least nickel (Ni) preferably in the M (III) form and preferably in the form of chloride or sulphate, and cellulose fragments resulting from degradation, such as cellobiose and/or glucose, and/or glucose degradation products such as 5-hydroxymethylfurfural and formic acid and less than approximately 2%, in particular less than approximately 0.2% by weight of C, in particular approximately 0.14%.