1679-47-6Relevant articles and documents
-
Marvel,Brace
, p. 1775 (1948)
-
Extension of the Eschenmoser sulfide contraction/iminoester cyclization method to the synthesis of tolyporphin chromophore
Minehan, Thomas G.,Kishi, Yoshito
, p. 6811 - 6814 (1997)
Tolyporphin chromophore 2 has been synthesized by performing a double-retroaldol/oxidation sequence on an octahydroporphyrin precursor 18 prepared by using the Eschenmoser sulfide-contraction/iminoester-condensation method.
-
Bianchi et al.
, p. 107,109,110 (1977)
-
-
Poosner,Loomis
, p. 892 (1972)
-
Esterification and ketalization of levulinic acid with desilicated zeolite β and pseudo-homogeneous model for reaction kinetics
Umrigar, Vaishali,Chakraborty, Mousumi,Parikh, Parimal
, p. 299 - 308 (2019)
To maximize the production of esters (E), keto (K) and keto-ester (KE) by esterification and ketalization of levulinic acid (LA) has been reacted using diols such as 1,2-propane diol (PDOL),1,2-ethane diol (EDOL), and 1,2,3-propane triol or glycerol (TRIOL) with desilicated Hβ. This work aims to assess the conversion and selectivity for the production of esters using conventional and microwave-irradiated (MWI) reactors. Catalysts characterizations were performed using NH3-temperature programme desorption, Brunauer, Emmett and Teller surface area (BET), Barrett, Joyner, and Halenda (BJH), scanning electron microscope, transmission electron microscope, and dynamic light scattering. Operating parameters such as reaction temperature (170–180°C), reaction time (20–80?min), feed composition (LA:PDOL/EDOL/TRIOL, 1:8/10/12), and microwave energy (300–500 watt) have been systematically investigated. Note that 99–100% conversion was achieved with the product selectivity of E (40%), K (30%), and KE (30%) with1,2-EDOL; E (56%), K (2%), and KE (17%) with 1,2-PDOL; E (69%), K(0%), and KE (22%) with TRIOL using D-Hβ as a solid catalyst in an MWI reactor. Reaction paths and kinetics were studied using pseudo-homogeneous (PH) model.
Cobalt-Mediated Switchable Catalysis for the One-Pot Synthesis of Cyclic Polymers
Lam, Jacky W. Y.,Liao, Can,Tang, Ben Zhong,Wang, Xianhong,Wang, Yong,Xie, Xiaolin,Zhao, Yajun,Zhou, Xingping,Zhu, Shuaishuai
, p. 16974 - 16979 (2021)
A cobalt salen pentenoate complex [salen=(R,R)-N,N′-bis(3,5-di-tertbutylsalicylidene)-1,2-cyclohexanediamine] is rationally designed as the catalyst for the ring-opening copolymerization (ROCOP) of epoxides/anhydrides/CO2. Via migratory insertion of carbon monoxide (CO) into the Co?O bonds, the ROCOP-active species α-alkene-ω-O-CoIII(salen) can be rapidly and quantitatively transformed into α-alkene-ω-O2C-CoIII(salen) telechelic linear precursors. Upon dilution of reaction mixtures, the homolytic cleavage of Co?C bonds induced by visible light generates α-alkene acyl radicals that spontaneously undergo intramolecular radical addition to afford organocobalt-functionalized cyclic polyesters and CO2-based polycarbonates with excellent regioselectivity. The cyclic products can either react with radical scavengers to generate metal-free cyclic polymers or serve as photo-initiators for organometallic-mediated radical polymerization (OMRP) to produce tadpole-shaped copolymers.
A aqueous phase catalytic itaconic acid hydrogenation process for preparing butyl lactone method (by machine translation)
-
Paragraph 0028; 0029; 0030, (2019/05/16)
The invention relates to a process for preparing aqueous phase catalytic itaconic acid butyl lactone of hydrogenation method, relates in particular to a itaconic acid aqueous phase hydrogenation process for preparing butyl lactone (α - methyl - γ - butyrolactone and β - methyl - γ - butyrolactone) synthesis process and corresponding hydrogenation metal catalyst preparation and its in the reaction applied research. Butyl lactone is a molecule of simple structure but the synthetic route complex important organic compounds, widely applied to the resin solvent, lubricant, plasticizer, non-ionic surface-active agent of the gelling agent, lactone additives of leaded gasoline, synthetic fiber of cellulose ester such as dyeing and synthesizing various related compounds such as pyrrolidone intermediate. The invention preparation of Ru-based catalyst, in mild aqueous phase under the reaction conditions, the itaconic acid catalytic hydrogenation reaction to prepare the butyl lactone, conversion can be 99%, butyl lactone yield can be up to 50%, the catalyst can be recycled many times. (by machine translation)
