Synthesis of <i>exo</i>-Imidazolidin-2-one Dienes, Their Isomerization, and Selectivity in Diels–Alder Cycloadditions
作者:Carlos Espinoza-Hicks、Pablo Montoya、Rafael Bautista、Hugo A. Jiménez-Vázquez、Luz M. Rodríguez-Valdez、Alejandro A. Camacho-Dávila、Fernando P. Cossío、Francisco Delgado、Joaquín Tamariz
DOI:10.1021/acs.joc.7b02344
日期:2018.5.18
condensation reaction was carried out with bis-imino derivatives, diacetyl, and triphosgene, affording symmetrically N,N-disubstituted dienes. The use of alkyl methyl α-diketones led to the formation of nonsymmetrical dienes, which underwent isomerization to provide more stable inner-outer-ring dienes under Lewisacid conditions. Evaluation was made of the reactivity as well as regio- and stereoselectivity
Dephthaloylation of 3-phthalimidoazetidin-2-one 1a with methylhydrazine affords the ringtransformation product 2b, rather than the expected 3-aminoazetidin-2-one 1b. Independently prepared azetidinone 1b, when treated with sodium hydroxide or methylhydrazine, is isomerized to compound 2b. A mechanism is suggested for transformation . - The tautomeric structures of the majority of the potentially tautomeric
Method for selective hydrogenation of polyunsaturated compounds into monounsaturated compounds using a homogeneous catalyst
申请人:Hillion Gerard
公开号:US20060129010A1
公开(公告)日:2006-06-15
A process for the selective hydrogenation of diolefinic compounds to mono-olefinic compounds uses a catalyst composition comprising at least one salt of a transition metal from groups IB, IIB, VB, VIB, VIIB and VIII of the periodic table, at least one ligand and at least one organometallic reducing agent, optionally in the presence of a non-aqueous ionic liquid selected from the group formed by liquid salts with general formula Q
+
A
−
(in which Q
+
represents a quaternary ammonium and/or quaternary phosphonium and A
−
represents any anion which can form a liquid salt below 90° C.).
Process for the codimerization of polyunsaturated fatty substances and olefins by iron complexes
申请人:——
公开号:US20010005758A1
公开(公告)日:2001-06-28
To obtain branched compounds from fatty substances, simple olefins are reacted on polyunsaturated esters, which may or may not be conjugated, in the presence of an iron catalytic system, whereby the products that are obtained, primarily mono-addition compounds, can be hydrogenated and transformed into various compounds that can be used in particular as a base for surfactants, emulsifiers, emollients, lubricants or heavy metal salts.
[EN] 9-THIABICYCLONONANEDIISOCYANATES AND POLYMERS PREPARED THEREFROM
申请人:THE DOW CHEMICAL COMPANY
公开号:WO1986000318A1
公开(公告)日:1986-01-16
(EN) 9-thiabicyclononanediisocyanates of structural formula (I), wherein each R, which may be the same or different, is an alkyl group containing 1 to 3 carbon atoms; each R', which may be the same or different, is hydrogen or methyl, at least two R' are hydrogen; and x and y are independently 0, 1 or 2, are made and to polyurethanes, polyureas and other useful polymers produces therefrom.(FR) 9-thiabicyclononane diisocyanates de formule structurale (I) où chaque R, pouvant être semblable ou différent, représente un groupe alkyle contenant de 1 à 3 atomes de carbone; chaque R' pouvant être semblable ou différent, représente un hydrogène ou un méthyle, au moins deux R' représentant un hydrogène; et x et y valent indépendamment 0, 1 ou 2. La présente invention a également trait aux polyuréthanes, polyurées et autres polymères utiles produits à partir de ceux-ci.