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- Dry_media_reaction abstract "A dry media reaction or solid-state reaction or solventless reaction is a chemical reaction system in the absence of a solvent. The drive for the development of dry media reactions in chemistry is economics (save money on solvents) ease of purification (no solvent removal post-synthesis) high reaction rate (due to high concentration of reactants) environmentally friendly (solvent is not required), see green chemistry Drawbacks to overcome: reactants should mix to a homogeneous system high viscosity in reactant system unsuitable for solvent assisted chemical reactions problems with dissipating heat safely; risk of thermal runaway side reactions accelerated if reagents are solids, very high energy consumption from millingIn one type of solventless reaction a liquid reactant is used neat, for instance the reaction of 1-bromonaphthalene with Lawesson's reagent is done with no added liquid solvent, but the 1-bromonaphthalene acts as a solvent.A reaction which is closer to a true solventless reaction is a Knoevenagel condensation of ketones with (malononitrile) where a 1:1 mixture of the two reactants (and ammonium acetate) is irradated in a microwave oven.Colin Raston's research group have been responsible for a number of new solvent free reactions. In some of these reactions all the starting materials are solids, they are ground together with some sodium hydroxide to form a liquid, which turns into a paste which then hardens to a solid.In another development the two components of an aldol reaction are combined together with the asymmetric catalyst S-proline in a ball mill in a mechanosynthesis. The reaction product has 97% enantiomeric excess.A reaction rate acceleration is observed in several systems when a homogeneous solvent system is rapidly evaporated in a rotavap in a vacuum, one of them a Wittig reaction. The reaction goes to completion in 5 minutes with immediate evaporation whereas the same reaction in solution after the same 5 minutes (dichloromethane) has only 70% conversion and even after 24 hours some of the aldehyde remains.".
- Dry_media_reaction wikiPageID "1711021".
- Dry_media_reaction wikiPageLength "2412".
- Dry_media_reaction wikiPageOutDegree "32".
- Dry_media_reaction wikiPageRevisionID "625213824".
- Dry_media_reaction wikiPageWikiLink Aldol_reaction.
- Dry_media_reaction wikiPageWikiLink Ammonium_acetate.
- Dry_media_reaction wikiPageWikiLink Ball_mill.
- Dry_media_reaction wikiPageWikiLink Category:Chemical_reactions.
- Dry_media_reaction wikiPageWikiLink Chemical_reaction.
- Dry_media_reaction wikiPageWikiLink Chemistry.
- Dry_media_reaction wikiPageWikiLink Concentration.
- Dry_media_reaction wikiPageWikiLink Dichloromethane.
- Dry_media_reaction wikiPageWikiLink Enantiomeric_excess.
- Dry_media_reaction wikiPageWikiLink Enantioselective_synthesis.
- Dry_media_reaction wikiPageWikiLink Green_chemistry.
- Dry_media_reaction wikiPageWikiLink Homogeneity_and_heterogeneity.
- Dry_media_reaction wikiPageWikiLink Ketone.
- Dry_media_reaction wikiPageWikiLink Knoevenagel_condensation.
- Dry_media_reaction wikiPageWikiLink Lawessons_reagent.
- Dry_media_reaction wikiPageWikiLink Liquid.
- Dry_media_reaction wikiPageWikiLink Malononitrile.
- Dry_media_reaction wikiPageWikiLink Mechanosynthesis.
- Dry_media_reaction wikiPageWikiLink Microwave_oven.
- Dry_media_reaction wikiPageWikiLink Naphthalene.
- Dry_media_reaction wikiPageWikiLink Neat.
- Dry_media_reaction wikiPageWikiLink Proline.
- Dry_media_reaction wikiPageWikiLink Reaction_rate.
- Dry_media_reaction wikiPageWikiLink Rotary_evaporator.
- Dry_media_reaction wikiPageWikiLink Sodium_hydroxide.
- Dry_media_reaction wikiPageWikiLink Solvent.
- Dry_media_reaction wikiPageWikiLink Thermal_runaway.
- Dry_media_reaction wikiPageWikiLink Vacuum.
- Dry_media_reaction wikiPageWikiLink Viscosity.
- Dry_media_reaction wikiPageWikiLink Wittig_reaction.
- Dry_media_reaction wikiPageWikiLink Work-up_(chemistry).
- Dry_media_reaction wikiPageWikiLinkText "dry media reaction".
- Dry_media_reaction wikiPageWikiLinkText "dry".
- Dry_media_reaction wikiPageWikiLinkText "neat".
- Dry_media_reaction wikiPageUsesTemplate Template:Unreferenced.
- Dry_media_reaction subject Category:Chemical_reactions.
- Dry_media_reaction hypernym System.
- Dry_media_reaction type Process.
- Dry_media_reaction type Reaction.
- Dry_media_reaction comment "A dry media reaction or solid-state reaction or solventless reaction is a chemical reaction system in the absence of a solvent.".
- Dry_media_reaction label "Dry media reaction".
- Dry_media_reaction sameAs Q1964722.
- Dry_media_reaction sameAs تفاعل_الوسط_الجاف.
- Dry_media_reaction sameAs واکنش_حالت_جامد.
- Dry_media_reaction sameAs m.05q929.
- Dry_media_reaction sameAs Твердофазные_реакции.
- Dry_media_reaction sameAs Q1964722.
- Dry_media_reaction sameAs 固相反应.
- Dry_media_reaction wasDerivedFrom Dry_media_reaction?oldid=625213824.
- Dry_media_reaction isPrimaryTopicOf Dry_media_reaction.