An expedient preparation of chiral building blocks having levoglucosenone chromophore: a new enanticontrolled route to (–)-β-multistriatin and (+)-exo-brevicomin
摘要:
2-Alkenylfurans are transformed enantioselectively into the bicyclic enones having the levoglucosenone chromophore, whose synthetic utility is demonstrated by a stereocontrolled synthesis of two insect pheromones (-)-beta-multistriatin and (+)-exo-brevicomin.
Methylenespiro[2.3]hexanes via Nickel-Catalyzed Cyclopropanations with [1.1.1]Propellane
作者:Songjie Yu、Adam Noble、Robin B. Bedford、Varinder K. Aggarwal
DOI:10.1021/jacs.9b10689
日期:2019.12.26
with poor selectivity. Herein, we report that nickel(0) catalysis enables the use of [1.1.1]propellane as a carbene precursor in cyclopropanations of a range of functionalized alkenes to give methylenespiro[2.3]hexane products. Computational studies provide support for initial formation of a Ni(0)-[1.1.1]propellane complex followed by concerted double C-C bond activation to give the key 3-methylenecyclobutylidene-nickel
[EN] BIOMASS CONVERSION<br/>[FR] CONVERSION DE LA BIOMASSE
申请人:NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURWETENSCHAPPELIJK ONDERZOEK TNO
公开号:WO2017204634A1
公开(公告)日:2017-11-30
Processes and reactor systems for biomass conversion are described. A continuous process for the conversion of carbohydrate-containing feed material into furanic compounds comprises a reaction step comprising subjecting said feed material to reaction conditions in a reaction medium comprising two immiscible liquid phases, including a reactive phase and an extractive phase, and a Brønsted acid as catalyst, wherein the reaction medium comprises a solid component comprising at least a part of a carbohydrate-containing fraction of said feed material.
Alternating co-polymers of cyclic dicarboxylic acids and cyclic diamines may be used to produce nylon 6,6. Di-substituted furan compounds may be used as the raw material for producing furan-dicarboxylic acids and/or furan-diamines. The furan-dicarboxylic acids and furan-diamines may be copolymerized to produce polymer precursors for nylon 6,6. The polymer precursors may be hydrogenated and/or deoxygenated to produce nylon 6,6.
[EN] ESTERS OF 5 -HYDROXYMETHYLFURFURAL AND METHODS FOR THEIR PREPARATION<br/>[FR] ESTERS DE 5-HYDROXYMETHYLFURAL ET PROCEDE CORRESPONDANT
申请人:BATTELLE MEMORIAL INSTITUTE
公开号:WO2007092569A1
公开(公告)日:2007-08-16
[EN] Disclosed are compositions and methods for the production of mono- esters and di-esters from the reaction of HMF and a reactant selected from a diacid or a diacid derivative; typical reactants are PAN, phthaloyl dichloride, dimethyl phthalate, maleic acid, and maleic anhydride or mono-esters that can be prepared from HMF and MAN. [FR] La présente invention concerne des compositions et des procédés de production de mono-esters et di-esters à partir de la réaction d'HMF et d'un réactif choisi parmi un diacide ou un dérivé diacide ; les réactifs typiques sont le PAN, le dichlorure de phtaloyle, le phtalate de diméthyle, l'acide maléique et l'anhydride maléique ou des mono-esters qui peuvent être préparés à partir d'HMF et de MAN.