Process for the preparation of sterically hindered...

Details Process for the preparation of sterically hindered... Process for the preparation of sterically hindered...

C - Chemistry, Metallurgy

07

C

202/79, 260/478.

C07C 69/732 (2006.01) C07C 67/03 (2006.01) C07C 69/88 (2006.01)

Patent

CA 1239146

Abstract If the transesterification of esters of the formula II Image with alcohols of the formula III Image is catalysed by treat- ment with catalytic amounts of an oxide or an organometallic com- pound of a metal of the fourth main group or subgroup of the peri- odic system, and if the resulting melt is then distilled in a flash distillation apparatus under specific conditions, compounds of the formula Image are obtained in a virtually quantitative yield. The products thus obtained do not contain any interfering by-products and do not have to be additionally purified. In this formula m is 1-4, n is 0-2, B is methyl or t-butyl, and A is a radical of an m-hydric al- cohol having 2-18 carbon atoms. These compounds are used as stabilizers for organic materials including polymers, oils, lubric- ants and the like.

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