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91. 发明授权

US4008275A Process for isolating 4,4'-diaminodiphenylmethane 失效
标题翻译：分离4,4 {40-二氨基二苯基甲烷的方法
公开(公告)号：US4008275A
公开(公告)日：1977-02-15
申请号：US605752
申请日：1975-08-18
申请人： Adnan A. R. Sayigh , Kwok K. Sun , Henri Ulrich
发明人： Adnan A. R. Sayigh , Kwok K. Sun , Henri Ulrich
IPC分类号： C07C85/26
CPC分类号： C07C209/78
摘要： 2,2'- AND 2,4'-DIAMINODIPHENYLMETHANE ARE SELECTIVELY REMOVED FROM ADMIXTURES THEREOF WITH THE 4,4'-ISOMER BY HEATING THE ISOMER MIXTURE AT 30.degree. TO 100.degree. C in the presence of styrene, .alpha.-alkylstyrenes, or the mono- or diamino nuclear substituted derivatives thereof and a catalyst (mineral acid, clays, diatomaceous earth, zeolites). The styrene or .alpha.-alkylstyrene can be employed as such or generated in situ from a precursor therefor. The process is particularly useful in facilitating the isolation of substantially pure 4,4'-diaminodiphenylmethane from the polyamine mixture obtained by condensation of aniline and formaldehyde.
摘要翻译：通过在苯乙烯，α-烷基苯乙烯存在下，在30℃至100℃下加热异构体混合物，可以从4,4'-异构体的形式中选择性地除去2,2'-和2,4'-二氨基二苯基甲烷。单 - 或二氨基核取代衍生物和催化剂（无机酸，粘土，硅藻土，沸石）。苯乙烯或α-烷基苯乙烯可以原样使用或从其前体原位产生。该方法特别有助于从通过苯胺和甲醛的缩合得到的多胺混合物中分离出基本上纯的4,4'-二氨基二苯基甲烷。

92. 发明授权

US3970700A Racemization of optically active amines 失效
标题翻译：光学活性胺的外消旋化
公开(公告)号：US3970700A
公开(公告)日：1976-07-20
申请号：US503691
申请日：1974-09-06
申请人： Tsuneyuki Nagase , Gohu Suzukamo , Yoshio Suzuki
发明人： Tsuneyuki Nagase , Gohu Suzukamo , Yoshio Suzuki
IPC分类号： B01J23/04 , C07C85/26
CPC分类号： C07C209/68 , B01J23/04 , C07C227/36 , C07B2200/07
摘要： A method for racemization of optically active amines which comprises contacting an optically active amine of the formula: ##EQU1## wherein C* is an asymmetric carbon atom, R.sub.1 is alkyl, aralkyl or aryl and R.sub.2 is aryl or alkoxycarbonyl, the aryl or aralkyl moiety bearing optionally one or more alkyl or alkoxy groups on the aromatic ring, provided that R.sub.1 and R.sub.2 are always different from each other, with an alkali metal catalyst selected from the group consisting of (1) an alkali metal deposited on a solid carrier, (2) an alkali metal dispersed in a liquid medium and (3) an alkali metal alloy at a temperature of from -10.degree. to 50.degree.C until a sufficient amount of the optically active amine is recemized.
摘要翻译：一种光学活性胺外消旋化的方法，其包括使下式的光学活性胺与式R 1 -C 6 H-R 2 | NH 2接触，其中C *是不对称碳原子，R 1是烷基，芳烷基或芳基，R 2是芳基或烷氧基羰基 R 1和R 2总是彼此不同，芳基或芳烷基部分任选地在芳环上具有一个或多个烷基或烷氧基，碱金属催化剂选自（1）碱金属沉积物在固体载体上，（2）分散在液体介质中的碱金属和（3）在-10℃至50℃的温度下的碱金属合金，直到接收到足够量的光学活性胺。

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