sulfinates and sodium bisulfite in water is investigated. It provides a direct and green route for the synthesis of α-xanthyl-α-aryl-2-propanones (P2P-xanthate derivatives), β-ketosulfones and β-keto sulfonic acids. High to excellent yields, performing the reaction in water under catalyst-free conditions, and easy work-up are the main advantages of this protocol.
[EN] A DEVELOPING AGENT PRECURSOR FOR LASER MARKABLE COMPOSITIONS<br/>[FR] PRÉCURSEUR D'AGENT DE DÉVELOPPEMENT POUR COMPOSITIONS POUVANT ÊTRE MARQUÉES AU LASER
申请人:AGFA NV
公开号:WO2018228857A1
公开(公告)日:2018-12-20
The invention relates to novel laser markable compositions comprising developing agent precursors according to formula (I).
该发明涉及具有根据式(I)的显影剂前体的新型可激光标记组合物。
House-Meinwald rearrangement of aryl-substituted epoxysulfones in hexafluoroisopropanol (HFIP)
作者:Alexandria Uritis、Hannah Phillips、Hunter Phillips、Thomas C. Coombs
DOI:10.1016/j.tetlet.2023.154716
日期:2023.9
β-Aryl-substituted α,β-epoxysulfones undergo House-Meinwald rearrangement to form α-aryl, α-sulfonyl aldehydes in high yields upon dissolution in hexafluoroisopropanol (HFIP), and in some cases, heating. These compounds are typically isolated as the corresponding alcohols following reduction with NaBH4. The β-aryl group is generally required for rearrangement and a variety of substitution patterns
A DEVELOPING AGENT PRECURSOR FOR LASER MARKABLE COMPOSITIONS
申请人:AGFA NV
公开号:EP3415498A1
公开(公告)日:2018-12-19
The invention related to novel developing agent precursors and to laser markable compositions comprising such developing agent precursors.
本发明涉及新型显影剂前体和包含此类显影剂前体的激光打标组合物。
Efficient Diastereoselective Syntheses of <i>erythro</i>- or <i>threo</i>-α-Alkyl-β-hydroxy Sulfones by Reductions of α-Alkyl-β-keto Sulfones with TiCl<sub>4</sub>/BH<sub>3</sub> or LiEt<sub>3</sub>BH/CeCl<sub>3</sub>, Respectively
A stereoselective synthesis of erythro- and threo-alpha-alkyl-beta-hydroxy sulfones by reduction of the corresponding alpha-alkyl-beta-keto sulfones has I,een developed. The pivotal role in this methodology is played by the chelating or nonchelating properties of the Lewis acid employed. The strong chelating TiCl4 led to the erythro isomer in high diastereomeric excess in noncoordinating solvents (CH2Cl2) at -78 degrees C using BH3/py as reducing agent, while the nonchelating CeCl3 gave a high excess of the three isomer in coordinating solvents (THF) at the same temperature using lithium triethylborohydride (LiEt3BH) as reducing agent. Moreover, this methodology has been successfully utilized for the synthesis of alpha-allyl-beta-hydroxy sulfones, which are useful synthetic intermediates to obtain 2,5-disubstituted tetrahydrofurans by electrophilic cyclization.