Johann Beckmann (1739–1811)

Johann Wolfgang

Cyclopropenium ion catalysed Beckmann rearrangement.

1-Chloro-2,3-diphenylcyclopropenium ion was found to be a very efficient organocatalyst (3 mol% loading) for liquid phase Beckmann rearrangement of various ketoximes to the corresponding amides/lactams within 2 h in acetonitrile at reflux temperature. This is the first example of the application of the cyclopropenium ion as a catalyst, which opens up a new aspect of the synthetic utility of aro...

Dr Johann Willers

Workflow Recovery * Johann Eder

WorkJlow management systems ( WFMSs) more and more become the basic technology for organizations to pei$orm their daily business processes (workjlows). A consistent and reliable execution of such processes is crucial for all organizations. We claim that this can only be achieved by integrating transactional features especially “workjlow transactions” into WFMSs. Based on this idea, we discuss i...

Fresnel Correction of the Beckmann Model

In this paper we suggest a modification to the Beckmann-Kirchhoff model of rough surface reflectance that can be used for surfaces of intermediate roughness. One of the problems with the existing Beckmann model is that it fails for large angles of incidence. This problem was overcome for rough surfaces by Vernold and Harvey who use a Lambertian form factor. Here we take this work one step furth...