Method for obtaining carboxylic acids by reaction of alkanes and
formiates
    3.
    发明授权
    Method for obtaining carboxylic acids by reaction of alkanes and formiates 失效
    通过反应碱和羧酸获得羧酸的方法

    公开(公告)号:US5191115A

    公开(公告)日:1993-03-02

    申请号:US623715

    申请日:1991-02-05

    CPC分类号: C07C51/353

    摘要: To produce a carboxylic acid R.sup.1 --COOH, in which R.sup.1 is a tertiary branched alkyl residue or a cycloalkyl residue with one or more rings, which may be attached, and possibly substituted by at least one alkyl residue, the alpha carbon atom of the carbonyl group being a tertiary carbon atom, a branched or cyclic alkane R.sup.1 H, in which R.sup.1 is a branched alkyl residue or a cycloalkyl residue with one or more rings, which may be attached, and possibly substituted by at least one alkyl residue, the alpha carbon atom of the hydrogen atom being a tertiary carbon atom or a secondary carbon atom capable of being rearranged during reaction to a tertiary atom, is reacted in the presence of an acid catalyst with a formiate H(CO)O(CR.sup.2 R.sup.3 R.sup.4), in which R.sup.2, R.sup.3 and R.sup.4 denote hydrogen or alkyl, under the three following conditions: that R.sup.2, R.sup.3 and R.sup.4 are not simultaneously hydrogen; that the formiate yields, in the reaction medium, directly or following a rearrangement, a stable R.sup.2 R.sup.3 R.sup.4 C.sup.+ cation; and that the alkane R.sup.2 R.sup.3 R.sup.4 CH formed can be easily eliminated from the reaction medium.

    摘要翻译: PCT No.PCT / FR90 / 00243 Sec。 371日期:1991年2月5日 102(e)日期1991年2月5日PCT提交1990年4月5日PCT公布。 第WO90 / 12779号公报 1990年11月1日。为了制备羧酸R1-COOH,其中R1是叔支链烷基残基或具有一个或多个环的环烷基残基,其可以连接并且可能被至少一个烷基残基取代, 作为叔碳原子的羰基的α碳原子,支链或环状烷烃R1H,其中R1是支链烷基或具有一个或多个环的环烷基残基,其可以连接并且可能被至少取代 一个烷基残基,氢原子的α碳原子是叔碳原子或能够在与叔原子反应期间重新排列的仲碳原子,在酸催化剂与甲酸H(CO)O (CR 2 R 3 R 4),其中R 2,R 3和R 4表示氢或烷基,在以下三个条件下:R2,R3和R4不同时为氢; 反应介质中的甲酸酯产率直接或重排后,稳定的R2R3R4C +阳离子; 并且可以容易地从反应介质中除去所形成的烷烃R2R3R4CH。

    Process for the preparation of beta-disubstituted monocarboxylic acids
    4.
    发明授权
    Process for the preparation of beta-disubstituted monocarboxylic acids 失效
    制备β-二取代一元羧酸的方法

    公开(公告)号:US4536594A

    公开(公告)日:1985-08-20

    申请号:US540118

    申请日:1983-10-07

    CPC分类号: C07C51/00 C07C51/093

    摘要: A process for the preparation of beta-disubstituted monocarboxylic acids derived from tertiary acyclic, monocyclic or bicyclic hydrocarbons. The process consists in reacting said hydrocarbons with vinylidene chloride and either a functional compound where the molecule includes a tertiary carbon atom bonded to the heteroatom of a functional group such as a tertiary alcohol, an ether, or a tertiary halide or an alkene, in the presence of a concentrated protonic acid. The reaction can be carried out in the presence of a catalyst of the Lewis acid type and particularly BF.sub.3. These acids are useful as synthesis intermediates and as additives for oils and lubricants.

    摘要翻译: 制备衍生自叔无环,单环或双环烃的β-二取代单羧酸的方法。 该方法包括使所述烃与偏二氯乙烯和官能化合物反应,其中分子包括与官能团的杂原子键合的叔碳原子,例如叔醇,醚或叔卤化物或烯烃,其中 存在浓缩的质子酸。 反应可以在路易斯酸型催化剂,特别是BF 3的存在下进行。 这些酸可用作合成中间体,也可用作油和润滑剂的添加剂。