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1. 发明授权

US6160160A Process for preparing benzyl carbazates 失效
标题翻译：制备苄基肼基甲酸酯的方法
公开(公告)号：US6160160A
公开(公告)日：2000-12-12
申请号：US369818
申请日：1999-08-06
申请人： Edwin Ritzer , Robert Sollner , Claus Dreisbach , Frank Jelitto
发明人： Edwin Ritzer , Robert Sollner , Claus Dreisbach , Frank Jelitto
IPC分类号： C07C281/02 , C07C261/00
CPC分类号： C07C281/02
摘要： The present invention relates to a process for preparing optionally substituted benzyl carbazates of formula (I) ##STR1## wherein each R.sup.1 independently represents C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, di(C.sub.1 -C.sub.4 -alkyl)amino, nitro, halogen, hydroxyl, the group X-R.sup.3, wherein X represents O or S and R.sup.3 represents straight-chain or branched C.sub.1 -C.sub.4 -alkyl, the group COOR.sup.4, wherein R.sup.4 represents C.sub.1 -C.sub.4 -alkyl, the group NR.sup.5 R.sup.6, wherein R.sup.5 and R.sup.6 independently represent C.sub.1 -C.sub.4 -alkyl, or a C.sub.3 -C.sub.6 -cycloalkyl group that is optionally substituted by straight-chain or branched C.sub.1 -C.sub.4 -alkyl groups, andn is an integer from 0 to 5,by reacting a dialkyl carbonate with an optionally substituted benzyl alcohol in the presence of a catalyst, separating off the resulting reaction mixture from the catalyst, and subsequently reacting the separated reaction mixture with hydrazine hydrate.
摘要翻译：本发明涉及制备任选取代的式（I）苄基肼基甲酸酯的方法，其中每个R 1独立地表示C 1 -C 4烷基，C 1 -C 4 - 烷氧基，二（C 1 -C 4 - 烷基）氨基，硝基，卤素，羟基基团X-R3，其中X表示O或S，R 3表示直链或支链C 1 -C 4 - 烷基，COOR 4基团，其中R 4表示C 1 -C 4 - 烷基，NR 5 R 6基团，其中R 5和R 6独立地表示 C 1 -C 4 - 烷基或任选被直链或支链C 1 -C 4 - 烷基取代的C 3 -C 6环烷基，n是0至5的整数，碳酸二烷基酯与任选取代的苄醇在催化剂存在下分离得到的反应混合物，然后使分离的反应混合物与水合肼反应。

2. 发明授权

US5773664A Process for the recovery of 4-hydroxybenzaldehyde from reaction mixtures containing same 失效
标题翻译：从含有它们的反应混合物中回收4-羟基苯甲醛的方法
公开(公告)号：US5773664A
公开(公告)日：1998-06-30
申请号：US592162
申请日：1996-01-26
申请人： Albert Schnatterer , Helmut Fiege , Frank Jelitto , Peter Skornia , Karl-Heinz Theisen
发明人： Albert Schnatterer , Helmut Fiege , Frank Jelitto , Peter Skornia , Karl-Heinz Theisen
IPC分类号： B01J27/25 , B01J31/22 , C07B61/00 , C07C45/36 , C07C45/78 , C07C45/85 , C07C47/565 , C07C45/81
CPC分类号： C07C45/36 , C07C45/78
摘要： A process for separating off poorly soluble by-products from reaction mixtures which are produced in the oxidation of p-cresol with oxygen or an oxygen-containing gas in methanol as solvent in the presence of alkali metal hydroxide and in the presence of metal compounds as catalyst, is characterized in that, after the oxidation, excess alkali is neutralized to the extent that a salt precipitate forms and this salt precipitate is separated off together with the poorly soluble by-products.
摘要翻译：在碱金属氢氧化物存在下，在甲醇作为溶剂的氧气或含氧气体氧化对甲酚的反应混合物中分离难溶的副产物的方法，在金属化合物存在下，作为催化剂的特征在于，在氧化之后，过量的碱被中和到形成盐沉淀物的程度，并且该盐沉淀物与难溶的副产物一起分离出来。

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