Facile Non-Catalyzed Synthesis of Tertiary Phosphine Sulfides by Regioselective Addition of Secondary Phosphine Sulfides to Alkenes
作者:Svetlana F. Malysheva、Nina K. Gusarova、Alexander V. Artem'ev、Nataliya A. Belogorlova、Alexander I. Albanov、Tatyana N. Borodina、Vladimir I. Smirnov、Boris A. Trofimov
DOI:10.1002/ejoc.201301786
日期:2014.4
An atom-economic green synthesis of tertiary phsophine sulfides has been developed based on catalyst- and solvent-free addition of secondary phosphine sulfides to diverse terminal and internal alkenes (hept-1-ene, cyclohexene, styrenes, allyl alcohol, vinyl ethers, vinyl sulfides, vinyltrimethylsilane, 1-vinylimidazoles, vinyl acetate). The reaction proceeds under mild conditions (80 °C, without solvent
Phosphine-Catalyzed Vinylation at Low Acetylene Pressure
作者:Nikolai A. Sitte、Maximilian Menche、Pavel Tužina、Frank Bienewald、Ansgar Schäfer、Peter Comba、Frank Rominger、A. Stephen K. Hashmi、Thomas Schaub
DOI:10.1021/acs.joc.1c01807
日期:2021.9.17
The vinylation of various nucleophiles with acetylene at a maximum pressure of 1.5 bar is achieved by organocatalysis with easily accessible phosphines like tri-n-butylphosphine. A detailed mechanistic investigation by quantum-chemical and experimental methods supports a nucleophilic activation of acetylene by the phosphine catalyst. At 140 °C and typically 5 mol % catalyst loading, cyclic amides,
与乙炔各种亲核试剂在1.5巴的最大压力的乙烯化是通过用有机催化方便膦等三-实现ñ丁基膦。通过量子化学和实验方法进行的详细机理研究支持膦催化剂对乙炔的亲核活化。在 140 °C 和通常 5 mol% 催化剂负载下,环酰胺、恶唑烷酮、脲、不饱和环胺和醇成功乙烯基化。此外,乙烯基鏻物种的原位生成也可用于醛的 Wittig 型官能化。
6-beta(substituted)-(S)-hydroxymethylpenicillanic acids and derivatives
申请人:Pfizer Inc.
公开号:US04782050A1
公开(公告)日:1988-11-01
Antibacterial penicillins of the formula ##STR1## or a pharmaceutically acceptable salt thereof wherein R.sup.1 is a heterocyclic group and R is hydrogen, the residue of certian carboxy protecting groups or the residue of an ester group readily hydrolyzable in vivo having activity against resistant organisms.
IONIC POLYMERS AND USE THEREOF IN BIOMASS PROCESSING
申请人:EMBION TECHNOLOGIES SA
公开号:US20200246785A1
公开(公告)日:2020-08-06
The invention provides ionic polymers (IP) consisting of anions and a polymeric backbone containing cations. The invention also provides the ionic polymers incorporated in membranes or attached to solid supports and use of the ionic polymers in processing of biomass.
Synthesis of Vinyl Monomers With Active Azaaromatic Groups. Phase-transfer Catalytic Approach
作者:Dariusz Bogdal、Krzysztof Jaskot
DOI:10.1080/00397910008086974
日期:2000.9
Abstract An efficient method based on the alkylation-elimination reactions under solid-liquid phase transfer-catalysis conditions (S/L PTC) is reported for the preparation of N-vinyl derivatives of azaheterocyclic compounds.