Silicon Carbide Passive Heating Elements in Microwave-Assisted Organic Synthesis
作者:Jennifer M. Kremsner、C. Oliver Kappe
DOI:10.1021/jo060692v
日期:2006.6.1
Microwave-assisted organic synthesis in nonpolar solvents is investigated utilizing cylinders of sintered silicon carbide (SiC)a chemically inert and strongly microwave absorbing materialas passive heating elements (PHEs). These heating inserts absorb microwave energy and subsequently transfer the generated thermal energy via conduction phenomena to the reaction mixture. The use of passive heating
Diels-Alder reactions using supercritical water as an aqueous solvent medium
作者:Michael B. Korzenski、Joseph W. Kolis
DOI:10.1016/s0040-4039(97)01274-4
日期:1997.8
A variety of Diels-Alderreactions have been performed in supercritical water as a reaction medium. The rapid reaction of Diels-Alderreactions of cyclopentadiene and various electron poor dienophiles such as diethyl fumarate and acrylonitrile is observed in supercritical water, and leads to high yields of clean products without added catalysts.
Continuous-Flow Microreactor Chemistry under High-Temperature/Pressure Conditions
作者:Tahseen Razzaq、Toma N. Glasnov、C. Oliver Kappe
DOI:10.1002/ejoc.200900077
日期:2009.3
High-temperature organic synthesis can be performed undercontinuous-flowconditions in a stainless steel microtubular flow reactor capable of achieving temperatures of 350 °C and 200 bar. Under these extreme experimental environments transformations normally performed in a high-boiling solvent at reflux temperature – or under sealed-vessel microwave conditions – can be readily converted to a flow
Microwave-Assisted Organic Synthesis in Near-Critical Water at 300 °C -A Proof-of-Concept Study
作者:Jennifer M. Kremsner、C. Oliver Kappe
DOI:10.1002/ejoc.200500324
日期:2005.9
Microwave-assisted organic synthesis in near-critical water (NCW) in the 270–300 °C temperature range has been investigated in a dedicated multimode microwave reactor utilizing heavy-walled quartz reaction vessels. Several different known transformations such as the hydrolysis of esters or amides, the hydration of alkynes, Diels–Alder cycloadditions, pinacolrearrangements, and the Fischerindolesynthesis were successfully