(S)‐[3.3′‐²H₂]Bimesityl

Abstract

1972 (a-[3.3 '-2H2

Atroposelective Synthesis of Axially Chiral Biaryl Compounds

“…Axially chiral biaryl compounds that bear different ortho substituents, such as the dimeric orcinol ( 15 ),30 are found ubiquitously (compare most of the biaryl species discussed in this article). Although less common, axial chirality may also result from an inequivalence of meta substituents, as found in the bimesityls 16 31 and in the naphthylisoquinoline alkaloid ancistrocladisine ( 19 ) 32. Furthermore, heteroaromatic systems provide the possibility to introduce chirality merely from the position of the heteroatom, as found in the dipyridyl quateraryl 17 33…”

Atropselektive Synthese axial‐chiraler Biaryle

“…[29] Axial-chirale Biaryle mit unterschiedlichen ortho-Substituenten wie das dimere Orcin 15 [30] sind weit verbreitet (vergleiche hierzu die überwiegende Anzahl der in diesem Artikel diskutierten Biaryle). Seltener resultiert Axialchiralität auch aus einer Ungleichheit der meta-Substituenten, wie in den Bimesitylenen 16 [31] und in dem Naphthylisochinolin-Alkaloid Ancistrocladisin (19). [32] Weiterhin bieten heteroaromatische Systeme die Möglichkeit, Chiralität lediglich durch die Position des Heteroatoms einzubringen, z.…”

A Novel, Highly Efficient Catalyst for Propane Dehydrogenation

“…The reaction is carried out catalytically because of cracking losses under thermal dehydrogenation conditions. Originally, chromium oxide was used as the catalyst for the dehydrogenation of ethane, propane, n -butane, and isobutane. , Chromium oxide supported on alumina is used for the dehydrogenation of C 2 −C 4 hydrocarbons to the corresponding alkenes. − Modified reforming catalysts consisting of platinum supported on nonacidic or alkaline alumina are used as well. , UOP has commercialized a catalytic dehydrogenation process based on such a catalyst . The process can be applied to pure or mixed C 2 −C 5 feedstocks …”