29.25 - Carboxyimide-function compounds (including saccharin and its salts) and imine-function compounds.

(A) IMIDES
Imideshave the general formula (R=NH), where R is a dibasic acyl radical.

(1) Saccharin or 1,2-benzisothiazolin-3-one 1,1-dioxide and its salts*. Saccharin is an odourless, white crystalline powder having a very sweet taste; its sodium and ammonium salts have a lower sweetening power but are more soluble. Tablets consisting solely of one of these products remain in this heading.
Preparations, used in human diets, consisting of a mixture of saccharin or its salts and a foodstuff, such as lactose, are however excluded from this heading and fall in heading 21.06 (see Note 1 (b) to Chapter 38). Those preparations consisting of saccharin or its salts and substances, other than a foodstuff, such as sodium hydrogencarbonate (sodium bicarbonate) and tartaric acid fall in heading 38.24.

(2) Succinimide, used in chemical synthesis.

(3) Phthalimide, used in chemical synthesis.

(4) Glutethimide. A psychotropic substance - see the list at the end of Chapter 29.
Organic imide derivatives of inorganic acids are classified in heading 29.29.

(B) IMINES
Imines, like imides, are characterised by the group =NH, but it is linked to a non-acidic organic radical : (R2C=NH).

(1) Guanidines*. The action of cyanamide on ammonia gives an imino-urea known as guanidine; this can be regarded as derived from urea by replacing the oxygen of the (C=O) group by an imino group (=NH) :
H2NCONH2 urea ...................................................................... (H2N)2C=NH guanidine
Guanidine is also formed in the oxidation of proteins; it can also be obtained synthetically. It is crystalline, colourless and deliquescent.
Its derivatives include :

(a) Diphenylguanidine*. Rubber accelerator.

(b) Di-o-tolylguanidine. Rubber accelerator.

(c) o-Tolyldiguanide. Rubber accelerator.

(2) Aldimines. These have the general formula (RCH=NR1) where R and R1 are alkyl or aryl radicals (methyl, ethyl, phenyl, etc.) or sometimes hydrogen.
They constitute the products known as Schiff's bases, the most important of which are :

(a) Ethylideneaniline.

(b) Butylideneaniline.

(c) Aldol-a- and -b-naphthylamines.

(d) Ethylidene-p-toluidine.
All these products are used in the rubber industry.

(3) Imino ethers*.

(4) Amidines.

(5) 2,6-Dichlorophenolindophenol.

This heading excludes, however, cyclic polymers of aldimines (heading 29.33).

HOME ｜ 이용약관 ｜ 개인정보취급방침 ｜ 도움말 ｜ 원격지원 ｜ 문제해결 ｜ About

[씨엘관세정보] 경기도 시흥시 서울대학로278번길 70 B동 1212호  [사업자번호] 137-10-87138  [대표] 박중광   clhs@clhs.co.kr   070-8802-8300   070-4214-8300