PROCEDIMENTO PER LA CONCIA DEL PELLAME CON DERIVATI DELLA TRIAZINA

Procedimento per la concia del pellame 5 con derivati della triazina comprendente almeno le fasi di trasformazione di pelle animale grezza in pelle decalcinata, sistemazione della pelle decalcinata in un recipiente in presenza di acqua a temperatura ambiente, 10 rotazione di detto recipiente, aggiunta di un derivato della triazina in concentrazione variabile fra 5,5% e 22% rispetto al peso trippa e disciolto in acqua, oppure di agenti condensanti solubili in acqua, scolatura e lavaggio in acqua

The Leather Industry: A Chemistry Insight Part I: an Overview of the Industrial Process

A panoramic overview of the leather world market is given. The industrial tanning process is schematically explained giving a general outline of how an animal skin is transformed into a durable material having many different characteristics according to its specific future use. All the tanning industrial steps are overviewed starting from soaking, liming and after various steps ending up with finishing. An insight of collagen chemistry is also given

PROCESS FOR TANNING LEATHERS WITH TRIAZINE DERIVATIVES

Procedimento per la concia del pellame con derivati della triazina comprendente almeno le fasi di trasformazione di pelle animale grezza in pelle decalcinata, sistemazione della pelle decalcinata in un recipiente in presenza di acqua a temperatura ambiente, rotazione di detto recipiente, aggiunta di un derivato della triazina in concentrazione variabile fra 5,5% e 22% rispetto al peso trippa e disciolto in acqua, oppure di agenti condensanti solubili in acqua, scolatura e lavaggio in acqua

A Practical, Enantioselective Synthesis of the Fragrances Canthoxal and Silvial (R), and Evaluation of Their Olfactory Activity

The fragrances (S)-(+)- and (R)-(-)-canthoxal [(S)-(+)- and (R)-(-)-3-(4-methoxyphenyl)-2-methylpropanal] and (+)- and (-)-Silvial® [(+)- and (-)-3-(4-isobutylphenyl)-2-methylpropanal] have been synthesized in high enantiopurity via a simple four-step strategy starting from the commercially available 4-substituted benzaldehydes. The key synthetic step is the catalytic asymmetric hydrogenation of the appropriate 3-aryl-2-methylacrylic acid which has been carried out employing an in situ prepared ruthenium/axially chiral phosphine catalyst (up to 98% ee). The olfactory activity of the single enantiomers has been evaluated.The fragrances (S)-(+)- and (R)-(-)-canthoxal [(S)-(+)- and (R)-(-)-3-(4-methoxyphenyl)-2-methylpropanal] and (+)- and (-)-Silvial® [(+)- and (-)-3-(4-isobutylphenyl)-2-methylpropanal] have been synthesized in high enantiopurity via a simple four-step strategy starting from the commercially available 4-substituted benzaldehydes. The key synthetic step is the catalytic asymmetric hydrogenation of the appropriate 3-aryl-2-methylacrylic acid which has been carried out employing an in situ prepared ruthenium/axially chiral phosphine catalyst (up to 98% ee). The olfactory activity of the single enantiomers has been evaluated