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solventl
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There are 8 letters in SOLVENTL ( E1L1N1O1S1T1V4 )
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Definitions of solventl in various dictionaries:
SOLVENTL - 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 dev...
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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 chemistryDrawbacks 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. |