公开(公告)号：US4705869A

公开(公告)日：1987-11-10

申请号：US762031

申请日：1985-08-02

Applicant: Helmut Nickels ,  Alfred Hackenberger

Inventor： Helmut Nickels ,  Alfred Hackenberger

IPC: C07D307/62

CPC classification number: C07D307/62

Abstract: Fatty acid esters of ascorbic acid are prepared by a process in which a homogeneous mixture of(a) ascorbic acid,(c) concentrated sulfuric acid having a concentration of not less than 96% and(c) a methyl or ethyl ester of a fatty acid of 12 to 18 carbon atomsis reacted at from 20.degree. to 50.degree. C.Using the novel process, the fatty acid esters of ascorbic acid, in particular ascorbyl palmitate, which are very desirable antioxidants are obtained by a procedure which is technically simpler and hence cheaper than the conventional processes, but in equally good yields.

Abstract translation: 抗坏血酸的脂肪酸酯通过以下方法制备，其中（a）抗坏血酸，（c）浓度不低于96％的浓硫酸和（c）脂肪的甲基或乙酯的均匀混合物 12至18个碳原子的酸在20至50℃下反应。使用新方法，通过在技术上更简单的方法获得非常理想的抗氧化剂的抗坏血酸脂肪酸酯，特别是抗坏血酸棕榈酸酯 因此比常规方法便宜，但产量相同。

公开(公告)号：US4645863A

公开(公告)日：1987-02-24

申请号：US457464

申请日：1983-01-12

Applicant: Walter Rebafka ,  Helmut Nickels

Inventor： Walter Rebafka ,  Helmut Nickels

IPC: C07C69/025 ,  B01J31/00 ,  B01J31/10 ,  C07B61/00 ,  C07C27/00 ,  C07C29/04 ,  C07C33/025 ,  C07C33/03 ,  C07C35/02 ,  C07C67/00 ,  C07C67/04 ,  C07C69/145

CPC classification number: C07C29/04 ,  C07C33/025 ,  C07C67/04

Abstract: Process for the preparation of unsaturated alcohols and/or esters thereof by reacting conjugated dienes with water and/or aqueous carboxylic acid solutions in the presence of a macroporous acid ion exchanger and suitable solvents. The diene has the general formula I ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are hydrogen or a methyl group and R.sup.2 also can represent an aliphatic hydrocarbon radical having 2 to 6 carbon atoms which may contain a double bond which is not in a conjugated position relative to the double bonds of the diene, and preferably R.sup.1 and R.sup.3 each represent groups CH.sub.3 or CH.sub.2 --CH.sub.3. Said diene is reacted in a homogeneous or quasi-homogeneous phase in the presence of said macroporous acid ion exchanger.

Abstract translation: 在大孔酸离子交换剂和合适的溶剂存在下，共轭二烯与水和/或含水羧酸溶液反应制备不饱和醇和/或酯的方法。 二烯具有通式I（I），其中R 1，R 2和R 3是氢或甲基，R 2也可以表示具有2至6个碳原子的脂族烃基，其可以含有不是双键的脂族烃基 在相对于二烯的双键的共轭位置，优选地，R 1和R 3各自表示基团CH 3或CH 2 -CH 3。 所述二烯在所述大孔酸离子交换剂存在下在均相或准均相中反应。

公开(公告)号：US4613683A

公开(公告)日：1986-09-23

申请号：US694937

申请日：1985-01-25

Applicant: Walter Rebafka ,  Helmut Nickels

Inventor： Walter Rebafka ,  Helmut Nickels

IPC: C07C69/88 ,  C07C67/08

CPC classification number: C07C67/03

Abstract: C.sub.1 -C.sub.20 -alkyl gallates are prepared by reacting tannin-containing material with the corresponding alcohol R--OH and a strong acid.

Abstract translation: 通过使含单宁的材料与相应的醇R-OH和强酸反应来制备没食子酸C1-C20烷基酯。