摘要:
The present invention provides compounds and methods that can be used to convert the intermmediate halomethyl ketones (HMKs), e.g ., chloromethyl ketones, to the corresponding S,S- and R,S- diastereomers. More particularly, the present invention provides: (1) reduction methods; (2) inversion methods; and (3) methods involving the epoxidation of alkenes. Using the various methods of the present invention, the R,S-epoxide and the intermediary compounds can be prepared reliably, in high yields and in high purity.
摘要:
Macrocyclic epoxy resins comprising at least one compound of formula (I) wherein n is an integer from 3 to 10. R?1 and R3¿ are either the same or different and are selected from hydrogen, hydroxyl, alkoxy, allyloxy and epoxypropyloxy (glycidyloxy); R2 is selected from hydrogen, arylalkyl optionally substituted with halogen, alkyl optionally substituted with halogen, and aryl optionally substituted with halogen; R4 is selected from hydrogen, alkyl optionally substituted with halogen, arylalkyl optionally substituted with alkyl or halogen, and aryl optionally substituted with halogen; R5 is selected from hydrogen, aryl and alkyl; with the proviso that the resin contains on average at least one epoxy group per molecule.
摘要:
Herstellung von Diglycidyloligoethern der Formel I
n = durchschnittlich 5 bis 10), indem man einen Diglycidyloligoether II
bei 20 bis 60°C bei einem Wasserstoffdruck von 100 bis 400 bar mittels Rutheniumoxidhydrat als Katalysator hydriert. Die Verbindungen I dienen als Bausteine für Polymere, insbesondere für Epoxiharze.
摘要:
Es wird ein neues Verfahren zur Herstellung von Hydrochinonderivaten der Formel worin R eine Aetherschutzgruppe darstellt, beschrieben, sowie deren Ueberführung in d-a-Tocopherol ausgehend von Verbindungen der Formel worin R obige bedeutung hat.
摘要:
The present invention provides compounds and methods that can be used to convert the intermmediate halomethyl ketones (HMKs), e.g ., chloromethyl ketones, to the corresponding S,S- and R,S- diastereomers. More particularly, the present invention provides: (1) reduction methods; (2) inversion methods; and (3) methods involving the epoxidation of alkenes. Using the various methods of the present invention, the R,S-epoxide and the intermediary compounds can be prepared reliably, in high yields and in high purity.