Xn:Harmful;
332-77-4Relevant articles and documents
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Baggaley,Brettle
, p. 108 (1966)
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Method of preparing 2,5-dimethoxy-2,5-dihydrofuran through biomass furan photocatalysis
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Paragraph 0020-0039, (2020/02/20)
The invention discloses a method of preparing 2,5-dimethoxy-2,5-dihydrofuran through biomass furan photocatalysis. Currently, two traditional synthesis methods are available, wherein one is a chemicalsynthesis method which is implemented through a halogenation reaction between furan and elemental bromine, and the method is gradually eliminated because the reaction process is high in production cost and causes serious environmental pollution; and the other one is an electrolysis method, wherein the furan is subjected to electrolytic oxidation in a methanol solution, and the method has the defects that production cost is high, and electrolyte treatment is complicated. According to the method, biomass furan and methanol are used as raw materials, and the 2,5-dimethoxy-2,5-dihydrofuran is synthesized through a photocatalyst function in a room-temperature normal-pressure air atmosphere under visible light illumination. Through the method, operation is easy, production cost is greatly lowered, environmental pollution is avoided, and therefore the synthesis method has industrial development value and is efficient and environmentally friendly.
A 2, 5 - furan two alkoxyl dihydro preparation method of compound
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Paragraph 0023; 0024, (2017/08/25)
The invention provides a preparation method of a 2,5-dialkoxyl dihydrofuran compound. The preparation method comprises the following steps: adding a furan compound shown by a formula I, alkyl alcohol shown by a formula III and an acid-binding agent into a reactor, stirring to react with chlorine, keeping the reaction temperature to be (-25)-25 DEG C, and reacting to obtain a 2,5-dialkoxyl dihydrofuran compound shown by a formula II, wherein in the formulas, R1, R2, R3 and R4 are independent hydrogen, halogen and C1-C5 alkyl, and R1 is a C1-C12 alkyl. The method provided by the invention is less in investment, low in energy consumption and high in efficiency; the reaction method is simple, and the operation is convenient and easy to implement; the raw materials are low in price, easy to obtain, and low in production cost; a byproduct is salt and can meet requirements on environmental protection; and the preparation method is suitable for performing industrial large-scale production of the 2,5-dialkoxyl dihydrofuran compound. Particularly, when a phase transfer catalyst is added into the method provided by the invention, the method also has the advantage that the yield of a target product is obviously improved.
METHOD FOR PRODUCING ALKOXYLATED 2,5-DIHYDROFURAN BUT-2-ENE DERIVATIVES OR TETRA-1,1,4,4-ALKOXYLATED BUT-2-ENE DERIVATIVES
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Page/Page column 9, (2008/06/13)
The invention relates to a method for producing 2,5-dihydrofuran derivatives that are substituted in position 3 or 4, which carry a respective C1 to C6 alkoxy group (DHF alkoxy derivates I) in position 2 or position 5, or in both positions, or for producing 1,1,4,4-tetraalkoxy but-2-ene derivatives that are substituted in position 3 or 4, from 2-butene-1,4-diol derivatives of general formula (I), in which the groups R1 and R2 independently of one another represent hydrogen, C1 to C6 alkyl, C6 to C12 aryl or C5 to C12 cycloalkene or R1 and R2 together with the double bond, to which they are linked, form a C6 to C12 aryl group or a mono- or polyunsaturated C5 to C12 cycloalkyl group, or from a mixture of said 2-butene-1,4-diol derivatives and 2,5-dihydrofuran derivatives that are substituted in position 3 or 4 and carry a C1 to C6 alkoxy group in position 2 or 5, by electrochemical oxidation in the presence of a C1 to C6 monoalkyl alcohol.
