81730-45-2Relevant academic research and scientific papers
Chloride-Bridged Dinuclear Rhodium(III) Complexes Bearing Chiral Diphosphine Ligands: Catalyst Precursors for Asymmetric Hydrogenation of Simple Olefins
Kita, Yusuke,Hida, Shoji,Higashihara, Kenya,Jena, Himanshu Sekhar,Higashida, Kosuke,Mashima, Kazushi
, p. 8299 - 8303 (2016)
Efficient rhodium(III) catalysts were developed for asymmetric hydrogenation of simple olefins. A new series of chloride-bridged dinuclear rhodium(III) complexes 1 were synthesized from the rhodium(I) precursor [RhCl(cod)]2, chiral diphosphine ligands, and hydrochloric acid. Complexes from the series acted as efficient catalysts for asymmetric hydrogenation of (E)-prop-1-ene-1,2-diyldibenzene and its derivatives without any directing groups, in sharp contrast to widely used rhodium(I) catalytic systems that require a directing group for high enantioselectivity. The catalytic system was applied to asymmetric hydrogenation of allylic alcohols, alkenylboranes, and unsaturated cyclic sulfones. Control experiments support the superiority of dinuclear rhodium(III) complexes 1 over typical rhodium(I) catalytic systems.
Ultrasound-Mediated Synthesis and Mass Spectrometric Fragmentation of Dimethyl-Substituted 1,2-Diphenylethanols, Convenient Dimethylstilbene Precursors
Burkow, Ivan C.,Sydnes, Leiv K.,Ubeda, Danielle C. N.
, p. 235 - 244 (2007/10/02)
1,2-Diarylethanols were obtained in high yields by ultrasonic irradiation of mixtures of lithium sand, benzylic chlorides, and arenecarbaldehydes or aryl methyl ketones.The mass spectra of the alcohols contained dominant peaks for species formed by dehydration, α-cleavage processes and rearrangement involving hydrogen transfer.Acid-catalyzed dehydration of the alcohols gave the corresponding stilbenes in quantitative yields.
MECHANISM OF INTRAMOLECULAR CYCLIZATION IN ARYL 2-CYCLOPROPYLPHENYL SULFONES UNDER CONDITIONS OF ACID ISOMERATION
Pisanova, E. V.,Saginova, L. G.,Shabarov, Yu. S.
, p. 278 - 281 (2007/10/02)
Treatment of phenyl and p-tolyl 2-cyclopropylphenyl sulfones with concentrated sulfuric acid at 20 deg C leads to intramolecular cyclization with the formation of 10-methyl-10,11-dihydrobenzothiepin 5,5-dioxide and 8,10-dimethyl-10,11-dihydrobenzothiepin 5,5-dioxide.The reaction involves attack by the carbocation which forms at the ortho position of the adjacent benzene ring.
