91970-78-4Relevant articles and documents
Method for inhibiting condensation of lignin aryl ether dimer and/or lignin aryl ether dimer depolymerization product
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Paragraph 0043-0048, (2020/05/05)
The invention provides a method for inhibiting condensation of a lignin aryl ether dimer and/or a lignin aryl ether dimer depolymerization product, and belongs to the technical field of lignin depolymerization. The method for inhibiting condensation of the lignin aryl ether dimer and/or the lignin aryl ether dimer depolymerization product comprises the following steps: mixing the lignin aryl etherdimer with a eutectic solvent, and carrying out a reaction on the obtained mixed material under a heating condition, wherein the eutectic solvent is a mixture of choline chloride, diol and oxalic acid. The mixture of choline chloride, diol and oxalic acid is used as a eutectic solvent, and intramolecular/intermolecular condensation of the lignin aryl ether dimer and aldehyde condensation of a lignin aryl ether dimer depolymerization product can be inhibited under the condition that no catalyst is added; and the eutectic solvent is green, non-toxic, recyclable and degradable. The method provided by the invention is simple in process and remarkable in condensation inhibition effect.
Combination of NH2OH·HCl and NaIO4: an effective reagent for molecular iodine-free regioselective 1,2-difunctionalization of olefins and easy access of terminal acetals
Chakraborty, Nirnita,Santra, Sougata,Kundu, Shrishnu Kumar,Hajra, Alakananda,Zyryanov, Grigory V.,Majee, Adinath
, p. 56780 - 56788 (2015/07/15)
We have demonstrated a new application of our oxidizing reagent, a combination of NH2OH·HCl and NaIO4, in the first generalized regioselective 1,2-difunctionalization of olefins. It is a general method for the preparation of β-iodo-β′-hydroxy ethers, β-iodo ethers, β-iodohydrin, and β-iodo acetoxy compounds using different reaction media. The reactions are highly regioselective, always affording Markovnikov's type addition products. The methodology is also applicable for the easy access of terminal acetals. Molecular iodine-free synthesis, room temperature reaction conditions, high yields, use of less expensive reagents, mild reaction conditions, broad applicability of nucleophiles, and applicability for gram-scale synthesis are the notable advantages of this present protocol.
Nickel-mediated inter- and intramolecular reductive cross-coupling of unactivated alkyl bromides and aryl iodides at room temperature
Yan, Chang-Song,Peng, Yu,Xu, Xiao-Bo,Wang, Ya-Wen
supporting information; experimental part, p. 6039 - 6048 (2012/06/18)
A nickel-mediated intermolecular reductive cross-coupling reaction of unactivated alkyl bromides and aryl iodides at room temperature has been developed and successfully extended to less explored intramolecular versions and tandem cyclization-intermolecular cross-coupling. Highly stereoselective (or stereospecific) synthesis of linear-fused perhydrofuro[2,3-b]furan (pyran) and spiroketal skeletons allows rapid access to these useful building blocks, which would be potentially valuable in the synthesis of relevant natural products. A rational explanation for the formation of contiguous stereogenic centers is given. Copyright