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18 条记录 (耗时 0.012 秒)

    Process for the synthesis of alpha-substituted acroleins
    3.
    发明申请
    Process for the synthesis of alpha-substituted acroleins 失效
    合成α-取代丙烯醛的方法

    公开(公告)号：US20050215829A1

    公开(公告)日：2005-09-29

    申请号：US10810463

    申请日：2004-03-26

    申请人： Raj Deshpande ,  Makarand Diwakar ,  Raghunath Chaudhari

    发明人： Raj Deshpande ,  Makarand Diwakar ,  Raghunath Chaudhari

    IPC分类号： C07C45/49 ,  C07C45/50 ,  C07C45/75

    CPC分类号： C07C45/75 ,  C07C45/50 ,  C07C47/22

    摘要： The present invention provides an improved process for the synthesis of α-substituted acroleins from olefins by a tandem hydroformylation and Mannich reaction sequence in the presence of syngas and formaldehyde, wherein the two catalysts are segregated into two different phases thereby preventing deactivation of the catalysts by each other, and yielding a highly selective and active catalyst.

    摘要翻译： 本发明提供了一种在合成气和甲醛存在下通过串联加氢甲酰化和曼尼希反应顺序从烯烃合成α-取代的丙烯醛的改进方法，其中两种催化剂分离成两个不同的相，从而防止催化剂的失活 并产生高选择性和活性的催化剂。

    Process for preparation of esters of hydroxy tiglic aldehydes
    4.
    发明申请
    Process for preparation of esters of hydroxy tiglic aldehydes 失效
    羟基噻唑醛的酯的制备方法

    公开(公告)号：US20050215814A1

    公开(公告)日：2005-09-29

    申请号：US10813696

    申请日：2004-03-29

    申请人： Raghunath Chaudhari ,  Rashmi Chansarkar ,  Kausik Mukhopadhyay ,  Ashutosh Kelkar

    发明人： Raghunath Chaudhari ,  Rashmi Chansarkar ,  Kausik Mukhopadhyay ,  Ashutosh Kelkar

    IPC分类号： C07C67/29 ,  C07C67/297 ,  C07C67/36

    CPC分类号： C07C67/29 ,  C07C67/293 ,  C07C67/297 ,  C07C69/007 ,  C07C69/145 ,  C07C69/16

    摘要： The present invention relates to a process for the preparation of esters of hydroxy tiglic aldehydes which are the key intermediates for Vitamin-A acetate synthesis and various perfumistic products, said process relates to the hydroformylation of biscarboxylic esters of but-2-ene-1,4-diol, followed by deacetoxylation of its hydroformylation compound, in the presence of heterogeneous catalyst having rhodium complex entrapped, anchored or teethered on the acidic support, said acidic support causes deacetoxylation in the reaction mixture immediately after hydroformylation, to give 100% selectivity to the carboxylic esters of hydroxyl tiglic aldehydes in a single step.

    摘要翻译： 本发明涉及一种用于制备维生素A乙酸酯合成的关键中间体的羟基叔丁醛的酯的方法和各种香料产物，所述方法涉及丁-2-烯-1的双羧酸酯的加氢甲酰化， 然后在其加氢甲酰化化合物脱甲酰化，在含有铑络合物的非均相催化剂的存在下，在酸性载体上被捕获，锚定或引导，所述酸性载体在加氢甲酰化后立即在反应混合物中引起脱乙酰氧基化，得到100％选择性 在单一步骤中羟基叔丁醛的羧酸酯。

    Process for the preparation of 2-hydroxy carboxylic acids
    7.
    发明申请
    Process for the preparation of 2-hydroxy carboxylic acids 审中-公开
    2-羟基羧酸的制备方法

    公开(公告)号：US20050143600A1

    公开(公告)日：2005-06-30

    申请号：US10808965

    申请日：2004-03-25

    申请人： Raghunath Chaudhari ,  Sunil Tonde

    发明人： Raghunath Chaudhari ,  Sunil Tonde

    IPC分类号： C07C51/09 ,  C07C51/12

    CPC分类号： C07C51/09 ,  C07C59/08

    摘要： A two step preparation for hydroxy carboxylic acid (e.g. lactic acid) is disclosed. An enol ester (e.g. vinyl acetate) is carbonylated in the presence of a hydroxyl compound (e.g. methanol) using a palladium catalyst having one or more O-, N- and/or P-containing ligands (e.g. PdCl2(PPh3)2), and a solvent at 50-150° C./50-2000 psig to yield hydroxy ester (e.g. methyl lactate) and acetoxy ester (e.g. methyl-2-acetoxy propionate). The second step involves hydrolyzing the products of the carbonylation step using acid catalysts (e.g. TsOH, aq HCl, resin) at 10-125° C. to produce 2-hydroxy carboxylic acids (e.g. lactic acid). The carbonylation and hydrolysis catalysts may be separated and recycled.

    摘要翻译： 公开了羟基羧酸（例如乳酸）的两步制备。 使用具有一个或多个O，N-和/或P的配体（例如PdCl 2）的钯催化剂，在羟基化合物（例如甲醇）的存在下将烯醇酯（例如乙酸乙烯酯）羰基化， （PPh 3 N 2）2）和溶剂在50-150℃/ 50-2000psig下反应，得到羟基酯（例如乳酸甲酯）和乙酰氧基酯 （如甲基-2-乙酰氧基丙酸酯）。 第二步包括在10-125℃下使用酸催化剂（例如TsOH，HCl水溶液，树脂）水解羰基化步骤的产物以产生2-羟基羧酸（例如乳酸）。 羰基化和水解催化剂可以分离和再循环。

    Process for the preparation of tertiary amyl hydroperoxide
    8.
    发明申请
    Process for the preparation of tertiary amyl hydroperoxide 审中-公开
    叔戊基过氧化氢的制备方法

    公开(公告)号：US20060264677A1

    公开(公告)日：2006-11-23

    申请号：US11375703

    申请日：2006-03-14

    申请人： Vilas Rane ,  Raj Deshpande ,  Raghunath Chaudhari

    发明人： Vilas Rane ,  Raj Deshpande ,  Raghunath Chaudhari

    IPC分类号： C07C409/00

    CPC分类号： C07C409/04 ,  C07C29/50 ,  C07C407/00 ,  C07C31/125 ,  C07C31/08

    摘要： The present invention provides an improved process for the production of tertiary amyl hydroperoxide by the liquid phase oxidation of isopentane in presence of air or molecular oxygen as oxidant using the oxides of Group IIA metals such as magnesium, calcium, strontium and barium in high pressure reactor under stirring conditions at a temperature ranging between 110°-180° C. and at moderate pressures for a period of 0.1-12 h. The catalyst reused for sevral times without affecting its catalytic performance. The present invention produces a tertiary amyl hydroperoxide with 40-60% selectivity and tertiary amyl alcohol, which has a numerius industrial applications.

    摘要翻译： 本发明提供了一种通过在空气或分子氧作为氧化剂存在下通过异戊烷的液相氧化制备叔戊基过氧化氢的改进方法，其使用在高压反应器中使用IIA族金属如镁，钙，锶和钡的氧化物 在搅拌条件下，温度范围为110°-180℃，中等压力为0.1-12小时。 催化剂重复使用，不影响其催化性能。 本发明产生具有40-60％选择性的叔戊基过氧化氢和叔戊醇，其具有数量级的工业应用。

    Process for preparation of a mixture of alcohols and ketones by liquid phase oxidation of higher alkanes
    10.
    发明申请
    Process for preparation of a mixture of alcohols and ketones by liquid phase oxidation of higher alkanes 失效
    通过高级烷烃的液相氧化制备醇和酮的混合物的方法

    公开(公告)号：US20060094905A1

    公开(公告)日：2006-05-04

    申请号：US10976737

    申请日：2004-10-29

    申请人： Raj Deshpande ,  Vilas Rane ,  Raghunath Chaudhari

    发明人： Raj Deshpande ,  Vilas Rane ,  Raghunath Chaudhari

    IPC分类号： C07C27/12

    CPC分类号： C07C45/28 ,  C07C29/48 ,  C07C31/125

    摘要： The present invention provides a process for the production of a mixture of alcohols and ketones by the liquid phase oxidation of higher alkanes using a catalyst system consisting of transition group metal such as palladium and support such as alumina, silica, carbon, preferably carbon in the presence of alkyl hydroperoxide as oxygen carrier, under stirring conditions at a temperature range of 10°-120° C. and at atmospheric pressure in a stirred glass reactor for a period of 1-30 h. The present invention produces a mixture of alcohols and ketones with high selectivity (preferably 60-90%) along with other byproducts such as diketones and acids.

    摘要翻译： 本发明提供了一种通过使用由过渡金属如钯和由载体例如氧化铝，二氧化硅，碳，优选碳组成的催化剂体系，通过高级烷烃的液相氧化生产醇和酮的混合物的方法。 在搅拌条件下，在10°-120℃的温度和大气压下，在搅拌的玻璃反应器中，存在烷基氢过氧化物作为氧载体，时间为1-30小时。 本发明与其它副产物如二酮和酸一起产生具有高选择性（优选60-90％）的醇和酮的混合物。