Epimerization of sugars, in particular of D-arabinose to D-ribose
    3.
    发明授权
    Epimerization of sugars, in particular of D-arabinose to D-ribose 失效
    糖异构化,特别是D-阿拉伯糖对D-核糖

    公开(公告)号:US4778531A

    公开(公告)日:1988-10-18

    申请号:US68171

    申请日:1987-06-30

    CPC分类号: C07H3/02

    摘要: Pentoses and hexoses are epimerized by heating sugar dissolved in a solvent in the presence of a molybdenum(VI) compound, by an improved process in which, for the preparation of a sugar having cis OH groups in the 2- or 3-position, of the formula Ia or Ib ##STR1## where R is one of the radicals ##STR2## a homogeneous solution of the corresponding sugar of the formula IIa or IIb ##STR3## is heated to 75.degree.-100.degree. C. in the presence of from 30 to 200 mol %, based on sugar used, of a metal salt of the formula (III)MeX.sub.2 (III)where Me is Mg, Ca, Sr, Ba or Zn and X is Cl or Br, which may or may not contain water of crystallization, and in the presence of from 2 to 20 mol %, based on the sugar used, of a molybdenum(VI) compound.The process is particularly important for the preparation of D-ribose, which is required as an intermediate for vitamin B.sub.2.

    摘要翻译: 戊糖和己糖通过加热溶解在钼(VI)化合物存在下的溶剂中的糖进行差向异构化,其中通过改进方法,其中为了制备在2-或3-位具有顺式OH基团的糖, 式Ia或Ib的化合物,其中R是式IIa或IIb的相应糖的均匀溶液之一的基团之一,在30℃的存在下加热至75℃-100℃ (III)的MeX2(III)的金属盐,其中Me是Mg,Ca,Sr,Ba或Zn,X是Cl或Br,其可以含有或可以不含水 的结晶,并且在基于所用糖的2至20摩尔%的存在下,使用钼(VI)化合物。 该方法对于制备作为维生素B2的中间体的D-核糖是特别重要的。

    Preparation of alkylesters of
0,0-dialkyl-4-phosphono-2-methyl-2-butenoic acid and alkyl esters of
4-halo-2-methyl-2-butenoic acid containing a high percentage of E
isomers
    6.
    发明授权
    Preparation of alkylesters of 0,0-dialkyl-4-phosphono-2-methyl-2-butenoic acid and alkyl esters of 4-halo-2-methyl-2-butenoic acid containing a high percentage of E isomers 失效
    制备0-0-二烷基-4-膦酰基-2-甲基-2-丁烯酸的烷基酯和含有高百分比的E异构体的4-卤代-2-甲基-2-丁烯酸的烷基酯

    公开(公告)号:US5717128A

    公开(公告)日:1998-02-10

    申请号:US535637

    申请日:1995-09-28

    IPC分类号: C07C67/307 C07F9/40 C07C69/65

    CPC分类号: C07F9/4015 C07C67/307

    摘要: A process for the preparation of alkyl esters of 0,0-dialkyl-4-phosphono-2-methyl-2-butenoic acid containing a high percentage of E isomers, wherein the corresponding alkyl esters of 2-hydroxy-2-methyl-3-butenoic acid are caused to react with PBr.sub.3 or PCl.sub.3 at temperatures ranging from 0.degree. to 80.degree. C. in the absence of pyridine and, if desired, the resulting mixture comprising predominantly alkyl esters of 4-halo-2-methyl-2-butenoic acid is caused to react with trialkyl esters of phosphorous acid at temperatures ranging from 70.degree. to 140.degree. C. The end products are desirable C.sub.5 building blocks for polyene syntheses or preceding stages.

    摘要翻译: 一种制备含有高百分比的E异构体的0-二烷基-4-膦酰基-2-甲基-2-丁烯酸的烷基酯的方法,其中相应的2-羟基-2-甲基-3 在不存在吡啶的情况下,在0℃至80℃的温度范围内引发 - 丁烯酸与PBr 3或PCl 3反应,如果需要,所得混合物主要包含4-卤代-2-甲基-2- 使丁烯酸在70℃至140℃的温度范围内与亚磷酸三烷基酯反应。最终产物是用于多烯合成或先前阶段的所需C5构建块。

    Graft copolymers having improved phase binding between the graft base
and the grafted-on polymer phase
    10.
    发明授权
    Graft copolymers having improved phase binding between the graft base and the grafted-on polymer phase 失效
    具有改善接枝基质和接枝聚合物相之间的相结合的接枝共聚物

    公开(公告)号:US5384381A

    公开(公告)日:1995-01-24

    申请号:US152740

    申请日:1993-11-15

    CPC分类号: C08F261/06 C08F293/00

    摘要: Graft copolymers having improved phase binding between the graft base and the grafted-on polymer, are prepared from:a) a grafted-on polymer phase containing one or more monomers from the group consisting of (meth)acrylates of alcohols having 1 to 10 carbon atoms, vinyl esters of saturated aliphatic carboxylic acids having 2 to 10 carbon atoms, olefins, vinyl halides, styrene and styrene derivatives, andb) a peroxy group-containing copolymer phase containing from 0.01 to 20% by weight of an olefinically unsaturated peroxy compound of the general formula I or II ##STR1## where R.sup.1 is a chemical bond or a linear or branched alkyl chain having 1 to 10 carbon atoms or a cycloalkyl group having 3 to 10 carbon atoms, R.sup.2 and R.sup.3 are an alkyl group having 1 to 4 carbon atoms, R.sup.4 is an alkyl group or an alkyl-substituted phenyl group having 3 to 12 carbon atoms, and R.sup.5 is a cycloalkyl group having 3 to 12 carbon atoms, and from 80 to 99.9% by weight of one or more comonomers from the group consisting of the (meth)acrylates of alcohols having 1 to 10 carbon atoms, vinyl esters of saturated aliphatic carboxylic acids having 2 to 10 carbon atoms, olefins, vinylaromatic compounds, vinyl halides and/or vinyl ethers.The graft copolymers are useful as binders in the textile industry as heat stable binders, as adhesives in plasters and as binders in emulsion paints.

    摘要翻译: 具有改进的接枝基质和接枝聚合物之间的相结合的接枝共聚物由以下物质制备:a)接枝聚合物相,其含有一种或多种由具有1至10个碳的醇的(甲基)丙烯酸酯组成的组中的单体 原子,具有2-10个碳原子的饱和脂族羧酸的乙烯基酯,烯烃,乙烯基卤化物,苯乙烯和苯乙烯衍生物,和b)含有0.01-20重量%的烯属不饱和过氧化合物 其中R 1是化学键或具有1至10个碳原子的直链或支链烷基或具有3至10个碳原子的环烷基,所述通式I或II其中R 1, R2和R3是具有1至4个碳原子的烷基,R4是烷基或具有3-12个碳原子的烷基取代的苯基,R5是具有3-12个碳原子的环烷基,从80到 99.9重量%的一种或多种共聚单体f 由具有1-10个碳原子的(甲基)丙烯酸酯,具有2-10个碳原子的饱和脂族羧酸的乙烯基酯,烯烃,乙烯基芳族化合物,乙烯基卤化物和/或乙烯基醚构成的组中。 接枝共聚物可用作纺织工业中的粘合剂,作为热稳定粘合剂,作为膏药中的粘合剂和乳液涂料中的粘合剂。