Improved process for Synthesis of 2, 6, 6 - methyl - 2 - cyano tri methyl Tetra Hydro pyran and / or 2 - methyl - 2 - cyano - 5 - Methyl Iso propyl Tetra Hydro Furan

摘要

The present Invention relates to an improved process for the synthesis of Trimethyl 2,6,6 cyanomethyl tetrahydropyran and / or 2 - 2 - methyl - 2 - isopropyl - - tetrahydrofuran cyanomethyl 5,Dissolve 3, characterized by:7 - dimethyl - 3 - 6 - octenonitrilo nidroxi - in an Inert Solvent and Alcohol ciclizar contacting the solution thus obtained with a cation exchange resin Under specific conditionsTemperature and amount of Resin used selected to favour the formation of the final Compound desired; the conditions for the formation of the compound 2,6,6 - trimethyl - 2 - cyanomethyl tetrahydropyran are temperature 20oC - 150c and the Reaction is carried out in the presence of catalytic amounts almost to the cation exchange resin.And the conditions for the formation of compound 2 - methyl - 2 - cyano - methyl - 5 - isopropyl tetrahydrofuran are a temperature of 80 degrees centigrade - produced and the Reaction is carried out in the presence of a CAnd Ion exchange resin that varies from almost amounts to Relations of the catalytic Resin alcohol by weight, equal to 1 or greater, and optionally convert 2.6,6 - trimethyl - 2 - cyanomethyl tetrahydropyran 2 - methyl - 2 - isopropyl - tetrahydrofuran rearreglando cyanomethyl 5 - the first Compound under the conditions mentioned above for the formThe latter Compound.