Synthesis of 25-hydroxy- and 1.alpha.,25-dihydroxy vitamin D3 from vitamin D2 (calciferol)

Our Odyssey with Functionalized Chiral Phosphines: From Optical Resolution to Asymmetric Synthesis to Catalysis

“…Since its inception in the 1920s, the Diels–Alders (DA) reaction has been employed extensively in the formation of six‐membered rings. Today, this discovery empowers scientists in both fundamental research and the production of natural products and pharmaceuticals . Employing palladacycle 1 and its derivatives as reaction promoters, our group has extensively studied the asymmetric Diels–Alders reaction between 3,4‐dimethyl‐1‐phenylphosphole (DMPP) and a series of functionalized olefins to produce P*‐phosphanorbornenes 6 (Scheme ).…”

Purification and biochemical characterisation of a novel glutamate decarboxylase from rice bran

“…Die Strategie auf Grundlage des Prinzips der Schutzgruppeneinführung im 5,7‐Diensystem wurde von Barton, Hesse et al. hinsichtlich der Verwendung von Schwefeldioxid weiter ausgebaut,39 inspiriert durch eine wegweisende Arbeit von Staudinger und Ritzenthaler aus dem Jahr 1935 40. Die cheletrope [4+1]‐Addition von SO 2 an ein 1,3‐konjugiertes Dien kann im Rahmen dieses Aufsatzes zu [4+2]‐DA‐Reaktionen nicht behandelt werden.…”

Determination of Sudan IV in hot chilli powder with luminol/dissolved oxygen chemiluminescence system

“…The strategy, based on the principle of protecting the 5,7‐diene system, was extended to the use of sulfur dioxide by Barton, Hesse, and co‐workers,39 inspired by the pioneering work of Staudinger and Ritzenthaler in 1935 40. The [4+1] cheletropic addition of SO 2 onto a 1,3‐conjugated diene is beyond the scope of this Review devoted to [4+2] DA reactions.…”