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Jacobsen's catalysts R = Alkyl, O-alkyl, O-trialkyl Best Jacobsen catalyst: R = t Bu Katsuki's catalysts R 1 = Aryl, substituted aryl R 2 = Aryl, Alkyl. The Jacobsen epoxidation, sometimes also referred to as Jacobsen-Katsuki epoxidation is a chemical reaction which allows enantioselective epoxidation of unfunctionalized alkyl- and aryl- substituted alkenes.
Jacobsen was born on February 22, 1960, in New York City. [1] Jacobsen attended New York University for his undergraduate studies, graduating with his B.S. in 1982. He attended the University of California, Berkeley for graduate school, earning his Ph.D. in 1986 under the tutelage of Robert G. Bergman.
See below for a survey of the substrate scope of the reaction. When chiral, non-racemic peroxides are used, the two transition states of epoxidation leading to enantiomeric products are diastereomeric. Steric interactions between the peroxide, enone, and templating cation M + influence the sense of selectivity observed. [9] (3)
Rosenthal and Jacobson held that high expectations lead to better performance and low expectations lead to worse, [3] both effects leading to self-fulfilling prophecy. According to the Pygmalion effect, the targets of the expectations internalize their positive labels, and those with positive labels succeed accordingly; a similar process works ...
Despite their awkward appearance, the platypus has a superpower-like sixth sense that it uses to hunt. With a beaver’s tail, webbed feet, and a duck’s bill, platypuses are one of the world’s ...
An assumption that Jacobson's debating opponent similarly raised, during the Ted talk Does the world need nuclear energy? in 2010, with Jacobson heading the debate in the negative. [85] Jacobson assumes, at the high end (180.1 g/kWh), that 4.1 g/kWh are due to some form of nuclear induced burning that will occur once every 30 years.
In a sense, he’s trapped: When his movies have a twist, we compare it unfavorably with the one in “The Sixth Sense,” and if they don’t have a twist, we feel weirdly let down.
The original conjecture posed by Jacobson in 1956 [1] asked about noncommutative one-sided Noetherian rings, however Israel Nathan Herstein produced a counterexample in 1965, [2] and soon afterwards, Arun Vinayak Jategaonkar produced a different example which was a left principal ideal domain. [3]