Importance of molecular-level contacts under solventless conditions for chemical reactions and self-assembly
It has been shown that solventless reactions are accelerated when the reactants are mixed at molecular level. Accordingly, a solid film obtained by evaporating a solution of reactants mixture underwent facile reaction either upon grinding or upon simply standing. The effectiveness of these methods is evident from comparison with conventional solventless and solution reactions. It was concluded consequently that, once the molecular-level contacts are formed between reactants, the reaction occurs more efficiently under solventless conditions than in solution. Due to this pre-mixing method, efficient synthesis of [2]rotaxanes and rate acceleration of the Wittig reaction were achieved.
The invention provides a synthesis method of a chalcone derivative, which comprises the following steps: adding polyphosphoric acid PPA and a solvent 1, 4-dioxane into a container, sequentially adding98% concentrated sulfuric acid, substituted benzaldehyd
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Paragraph 0048-0050; 0081; 0082; 0088
(2020/07/03)
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