在常温常压下,它表现为稳定的白色叶状体或针形结晶,并且能溶于乙醇。几乎没有吸湿性,在放置两年以上的情况下纯度也不下降。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | cis-1,2,3,6-tetrahydrophthalic acid | 2305-26-2 | C8H10O4 | 170.165 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | meso-butane-1,2,3,4-tetracarboxylic acid tetramethyl ester | 1641-42-5 | C12H18O8 | 290.27 |
4-氧代-1,2-环戊烷二羧酸二甲酯 | dimethyl 4-oxocyclopentane-1,2-dicarboxylate | 6453-07-2 | C9H12O5 | 200.191 |
510,638. Butane polycarboxylic acids. JOHNSON, G. W. (I.G. Farbenindustrie Akt.- Ges.) July 20, 1938, No. 21573. [Class 2 (iii)] Butane polycarboxylic acids are produced by oxidising with nitric acid #<;4>; cyclohexenes which are substituted in at least one of the positions 1 and 2 of the hexene nucleus by carboxylic, carboxylic anhydride, cyano or keto groups. An oxidation catalyst, e.g. an alkali molybdate or vanadate, may be used. The #<;4>; cyclohexenes are prepared by condensing butadiene or other hydrocarbons of the butadiene series, 'e.g. isoprene, cyclohexadiene, with olefine compounds in which the carbon double linkage is in the alpha position to at least one carboxyl, cyano or keto group, e.g. crotonic acid, maleic acid, maleic anhydride, cinnamic acid, acrylic nitrile, cinnamic acid nitrile, maleic acid dinitrile, vinylalkyl ketones or vinyl benzoyl ketone. In examples (1) #<;4>;-cyclohexene-1-2 dicarboxylic anhydride is oxidised to butane- 1.2.3.4-tetracarboxylic acid and by boiling this with acetic anhydride the dianhydride is obtained ; (2) 2 - phenyl - #<;4>; - cyclohexene-1- carboxylic acid is oxidised to 2-phenylbutane- 1.3.4-tricarboxylic acid; (3) #<;4>;-cyclohexene-1- methyl ketone is oxidised to butane-1.2.4- tricarboxylic acid; (4) #<;4>;-cyclohexene-1-nitrile is oxidised to a mixture of butane-1.2.4- tricarboxylic acid and 2-cyanbutane-1.4-dicarboxylic acid.;4>;4>;4>;4>;4>;4>