Propentdyopents [5-(2-oxo-2H-pyrrol-5-ylmethylene)pyrrol-2(5H)-ones] and related compounds. Part 2. The Z⇄E photoisomerisation of pyrromethenone systems
The Z⇄E photoisomerisation of four α-unsubstituted pyrromethenones which are potential precursors of alkanol–propentdyopent adducts is studied using a direct n.m.r. spectroscopic approach in CD3OD–CDCl3. Chemical-shift assignments are made with the help of n.O.e. and decoupling experiments. For the polyalkylpyrromethenones the photostationary state contains ca. 25% of the E isomer: a system with a
Heterocyclic substituted sulfonyl ureas, and their use
申请人:Hoechst Aktiengesellschaft
公开号:US04379785A1
公开(公告)日:1983-04-12
What are disclosed are sulfonyl ureas of the formula ##STR1## in which R.sup.1, X and Y are as defined in the specification, and their physiologically acceptable salts, pharmaceutical formulations on the basis of these compounds, and their use in the treatment of diabetes.