结果1 题目18 Which substance causes the brown colour of aqueous bromine to disappear?A AB HH HH H C - C =C H-C→C→ C H C一C-O -H HH HH CD HH HO1H -C一C CC O -H/H HH n 相关知识点: 试题来源: 解析 A 反馈 收藏 ...
(e) A student added aqueous bromine to alkene C.C HCH2CH HH Describe the colour change seen and draw the structure of the product. Show all of the atoms and all of the bonds.colour change from... to...…structure(f) Two different alcohols can be produced from alkene B by an addit...
1 - Phenyl - 3 - (N - methylbenzthiazolylidene - 21 - amino - 5 - pyrazolone is prepared by reacting 1 - phenyl - 3 - (benzthiazolyl - 21) - amino-5-pyrazolone with dimethyl sulphate in presence of aqueous NaOH. 3-(11-phenyl-51-pyrazolonyl - 31) - methylamino - 1 - phenyl ...
Elemental bromine is very reactive and thus does not occur free in nature, but in colourless soluble crystalline mineral halide salts, analogous to table salt. Čisti brom se ne nalazi u prirodi, već uglavnom u vidu bezbojnih, rastvorljivih kristalnih halidnih mineralih soli, analog...
some of them have been used in painting as well, asjuices, i.e. simple aqueous extracts, orlakes, i.e. juices chemically or physically fixed on white inorganic substrates. Lakes are specific to art of painting, but there are strong similarities in the mechanisms of fixing dyes on fabrics...
in the presence of an acid condensing agent (e.g. acetic acid). Alternatively, when R1 represents an electronegative group, the compounds may be prepared by subjecting to treatment with aqueous alkali a compound of the formula: 1-Phenyl -3- (2-methyl -5- aminoanilino) -5-pyrazolone is...
A process for creating colour effects on synthetie fibrous materials wherein said fibrous materials are subjected to dyeing or printing between room temperature to below ISOF using aqueous dispersions or organic solvent solutions of dyestuffs of the formula 1 of the accompanying drawings In which A ...
(4) the potassium salt of anthraquinone-1-sulphonic acid is heated with aqueous isopropylamine, the product is either treated with bromine in glacial acetic acid, then with benzenesulphonamide and saponified, or is nitrated and reduced; in either case there is formed 1-amino-4-isopropylamino...
The invention comprises pyrazolone colour couplers of the formula: wherein R is a phenyl group which may be substituted (e.g. by chlorine, bromine, nitro or cyano), R1 represents a halogen atom or an alkyl, alkoxy, nitro or acylamino group, and R2 represents hydroben or the same as R...
in the presence of an acid condensing agent (e.g. acetic acid). Alternatively, when R1 represents an electronegative group, the compounds may be prepared by subjecting to treatment with aqueous alkali a compound of the formula: 1-Phenyl -3- (2-methyl -5- aminoanilino) -5-pyrazolone is...