Process for the preparation of 2-nitrobenzaldehyde
    281.
    发明授权
    Process for the preparation of 2-nitrobenzaldehyde 失效
    制备2-硝基苯甲醛的方法

    公开(公告)号:US3996289A

    公开(公告)日:1976-12-07

    申请号:US557297

    申请日:1975-03-11

    Applicant: Horst Meyer

    Inventor: Horst Meyer

    CPC classification number: C07C205/44 C07C201/12

    Abstract: 2-NITROBENZALDEHYDE, A VALUABLE CHEMICAL INTERMEDIATE, IS PREPARED THROUGH THE OXIDATION OF AN ALKALI METAL SALT OF 2-NITROPHENYLPYRUVIC ACID WITH POTASSIUM PERMANGANATE IN AN ALKALINE MEDIUM. Advantageously the requisite starting material is prepared directly by the reaction of 2-nitrotoluene and a diester of oxalic acid in the presence of an alcoholate and is then subjected to the oxidation without isolation. In a preferred embodiment the oxidation reaction mixture is acidified to convert the manganese-(IV) oxide to soluble maganese-(II) salts with concurrent conversion of oxalic acid to carbon dioxide. The process is industrially attractive in terms of the high yield, the availability of starting material and the ease of the manipulative steps involved.

    Abstract translation: 2-NITROBENZALDEHYDE,一种有价值的化学中间体,是通过在碱性介质中用硫酸钾处理2-硝基戊酸的碱金属盐来制备的。 有利的是,必需的原料直接通过在醇化物存在下由2-硝基甲苯与草酸二酯的反应制备,然后在不分离的条件下进行氧化。 在优选的实施方案中,将氧化反应混合物酸化以将锰(IV)氧化物转化为可溶性的锰 - (II)盐,同时将草酸转化为二氧化碳。 该方法在高产率,起始材料的可用性和所涉及的操纵步骤的容易性方面在工业上具有吸引力。

    Method for producing biphenyls
    282.
    发明授权
    Method for producing biphenyls 失效
    联苯生产方法

    公开(公告)号:US3950434A

    公开(公告)日:1976-04-13

    申请号:US374769

    申请日:1973-06-28

    Abstract: Biphenyl or nucleus-substituted biphenyl can be prepared from benzene or nucleus-substituted benzene and oxygen or oxygen-containing gas in one step according to an equation ##SPC1##Wherein X is H, lower alkyl having 1 to 6 carbon atoms Cl, NO.sub.2, or lower alkoxy having 1 - 3 carbon atoms and Y is H or CH.sub.3, with excellent yield by heating the reactants in the presence, as a catalyst, of palladium or a palladium compound and sulfuric acid or sulfuric acid and a lower saturated fatty acid added to the reaction system and further in the presence or in the absence of an alkali metal salt.

    Abstract translation: 联苯或核取代的联苯可以根据下式由苯或核取代的苯和氧或含氧气体制备,其中X为H,具有1至6个碳原子的低级烷基为Cl,NO 2或低级烷氧基 具有1-3个碳原子且Y是H或CH3,通过在作为催化剂存在钯或钯化合物和硫酸或硫酸和低级饱和脂肪酸加入到反应中的情况下加热反应物而具有优异的收率 进一步在碱金属盐的存在或不存在下进行。

    Production of halogenonaphthalenes
    290.
    发明授权
    Production of halogenonaphthalenes 失效
    生产卤素萘

    公开(公告)号:US3297770A

    公开(公告)日:1967-01-10

    申请号:US30551763

    申请日:1963-08-29

    Inventor: WILLIAM CUMMINGS

    Abstract: Halogenonaphthalenes are produced by contacting a naphthalene sulphonyl halide with a sulphuryl halide and a free radical source e.g. a peroxide or hydroperoxide. The process is stated to be less effective for producing fluoro- and iodothan for chloro- and bromo-naphthalenes. More than one sulphonyl halide group may be attached to the naphthalene nucleus which may also contain other substituents. Specific products mentioned are 1-chloro- and 2-bromo-naphthalenes, 1,5- and 2,7-dichloro- and dibromo-naphthalenes; 1,5-dichloro-3-nitro-naphthalene; 2,7-dichloro-1-methylnaphthalene; 1,5,7-trichloronaphthalene.

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