[EN] DEHYDRATIVE CYCLIZATION OF PENTITOLS USING WATER-TOLERANT LEWIS ACID CATALYSTS UNDER MILD CONDITIONS AND DERIVATIVES<br/>[FR] CYCLISATION PAR DÉSHYDRATATION DE PENTITOLS À L'AIDE DE CATALYSEURS DE TYPE ACIDE DE LEWIS TOLÉRANTS À L'EAU DANS DES CONDITIONS DOUCES, ET DÉRIVÉS CORRESPONDANTS
申请人:ARCHER DANIELS MIDLAND CO
公开号:WO2017030684A1
公开(公告)日:2017-02-23
A catalytic process for the dehydrative cyclization of pentitols to synthesize anhydropentitols is described. Water-tolerant Lewis acids (in particular, metal triflates) are employed as catalysts to improve conversion and anhydropentitol selectivity at ultra-low catalyst loadings. The process can produce cyclic ether triols in high yields with concurrent complete pentitol conversion.
Processes for the diastereoselective synthesis of nucleoside analogues
申请人:BioChem Pharma Inc.
公开号:US05756706A1
公开(公告)日:1998-05-26
The present invention relates to highly diastereoselective processes for production of cis-nucleosides and nucleoside analogues and derivatives in high optical purity, and intermediates useful in those processes.
What is proposed are specific tetrahydrofuran derivatives of the formula (I), fragrance and aroma substance mixtures comprising these tetrahydrofuran derivatives, their use in fragrance or aroma substance (mixture) and corresponding perfumed products.
Die vorliegende Anmeldung betrifft neue insektizide Iminoheterocyclen, Verfahren zu Ihrer Herstellung und ihre Verwendung zur Bekämpfung von tierischen Schädlingen, vor allem von Arthropoden, insbesondere Insekten.
What is proposed are specific tetrahydrofuran derivatives of the formula (I), fragrance and aroma substance mixtures comprising these tetrahydrofuran derivatives, their use in fragrance or aroma substance (mixture) and corresponding perfumed products.