52728-08-2Relevant academic research and scientific papers
GROUP 8 TRANSITION METAL CATALYSTS AND METHOD FOR MAKING SAME AND PROCESS FOR USE OF SAME IN OLEFIN DISPROPORTIONATION REACTIONS
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Page/Page column 34-35; 38, (2017/12/09)
These catalyst compounds are represented by the formula (I and VI): wherein M is a Group 8 metal; X is an anionic ligand; L is a neutral two-electron donor ligand; A is a monotopic or ditopic chelating ligand. The present invention also relates to an easy applicable catalyst synthesis and the application in different olefin metathesis processes, e.g. Reaction Injection Molding (RIM), rotational molding, vacuum infusion, vacuum forming, process for conversion of fatty acids and fatty acid esters or mixtures thereof, in -olefins, dicarboxylic acids or dicarboxylic esters, etc.
Determining the scope of the lanthanide mediated, sequential hydroamination/C-C cyclization reaction: Formation of tricyclic and tetracyclic aromatic nitrogen heterocycles
Molander, Gary A.,Pack, Shawn K.
, p. 10581 - 10591 (2007/10/03)
The scope of the lanthanide mediated, sequential hydroamination/C-C cyclization reaction was determined for the formation of tricyclic and tetracyclic aromatic nitrogen heterocycles. An array of ring sizes was explored to determine the diastereoselectivity. The electronic characteristics of the aromatic ring was also varied to determine how it affected the cascade reaction. It was found that the benzo[a]quinolizine and the pyrido[2,1,a]isoindolizine ring systems formed with the highest diastereoselectivity (>20:1), regardless of the electronic characteristics of the aromatic ring. Additionally, a tetracyclic indole nitrogen heterocycle was formed with a 2.3:1 diastereomeric ratio. A novel procedure for substrate preparation is also presented.
Rearrangements of 1,6,7-Trisubstituted 2-Methyl-1,2,3,4-tetrahydroisoquinolinium 2-Methylides
Sato, Yoshiro,Shirai, Naohiro,Machida, Yoshio,Ito, Emiko,Yasui, Takayo,et al.
, p. 6711 - 6716 (2007/10/02)
Chemical behavior of 1,6,7-trisubstituted 2-methy-1,2,3,4-tetrahydroisoquinolinium 2-methylides 4 was investigated in fluoride-ion induced desilation reaction of 1,6,7-trisubstituted 2-methyl-2-(trimethylsilyl)methyl-1,2,3,4-tetrahydroisoquinolinium iodid
Hofmann Degradation of β-Hydroxy Ammonium Salts. α- and β-Hydroxylaudanosine, 7-Hydroxyglaucine, and 13-Hydroxyxylopinine
Wert, Kathleen L.,Chackalamannil, Samuel,Miller, Eric,Dalton, David R.,Zacharias, David E.,Glusker, Jenny P.
, p. 5141 - 5150 (2007/10/02)
The four related β-hydroxy ammonium methiodide salts of α-hydroxylaudanosine (2a), β-hydroxylaudanosine (2b), 7-hydroxyglaucine (5a), and 13-hydroxyxylopinine (8a) have been subjected to Hofmann degradation.Although precedent dictates that such materials should form either epoxides or ketones, these are not found.Only products of (a) fragmentation and elimination (from 2a and 2b), (b) dehydration and elimination (from 5a), and (c) elimination and oxidation (from 8a) are obtained.The results are accounted for by consideration of the molecular geometries of theβ-hydroxy ammonium salts as experimentally determined from single-crystal X-ray studies and the geometric requirements for epoxide and ketone formation.
