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Priority to RO120340ApriorityCriticalpatent/RO92847B1/en
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Publication of RO92847B1publicationCriticalpatent/RO92847B1/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
Inventia se refera la un procedeu de purificare avansata a alfa-naftolului tehnic care contine beta-naftol ca impuritate principala, prin recristalizare din amestec de solventi. Purificarea este impusa de necesitatea încadrarii produsului în conditiile de calitate de înalta puritate cerute de utilizarea alfa-naftolului ca intermedisr în sinteza unor pesticide medicamente sau produse cosmetice. Alegeres solventilor de purificare este corelata cu principala utilizare a produsului, intermediar în sinteza principiului 1-naftil-N-metil-carbamat.The invention relates to an advanced purification process of the technical alpha-naphthol containing beta-naphthol as the main impurity by recrystallization from the solvent mixture. Purification is required by the need to place the product in the high-purity quality required by the use of alpha-naphthol as intermediary in the synthesis of pesticides or cosmetics. The choice of purification solvents is correlated with the main use of the product, intermediate in the synthesis of 1-naphthyl-N-methyl-carbamate.
RO120340A1985-10-111985-10-11Process for the purification of alpha-naphthol
RO92847B1
(en)
Derivatives of substituted 2-alkylthio-4,5-dimethyl-3-ethylthiazolium as intermediate product for the synthesis of nulmetinmerocyanine dyes, process fro the preparation thereof and process for the production of dyes based thereon