Aldehyde green

On treating rosaniline with aldehyde and sulphuric acid, a blue dyestuff is formed, which, on treatment with sodium thiosulphate in acid solution, yields aldehyde green. For its preparation, a mixture of rosaniline, aldehyde, and sulphuric acid is heated, till the product produces ablue-violet solution with water. It is then poured into a very dilute solution of sodium thiosulphate. S ulphur and a grey compound separate, while the green remains dissolved. It may be precipitated by addition of zinc chloride or acetate of soda fin one case a zinc double salt, and in the other a free base, is obtained. 

The chemistry of the reactions taking place in the preparation of aldehyde green has been studied in detail with pararosaniline. 

In the first stages of the reaction a blue dyestuff, the so-called aldehyde blue, is formed, along with a green dyestuff. 

This blue has the composition of an anhydro-aJdol-pararosani-line, 

Of course, the products obtained from rosaniline contain one methyl-group more than is expressed in the above formulae its position can only he a matter of speculation. 

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Miss Dior (chyprepatchouli aldehyde green) Miss Dior (Dior 1947)... 

Aldehydgriin, n. aldehyde green, aldehydhaltig, a. containing aldehyde. Aldehydharz, n. aldehyde resin, aldehydisch, a. aldehydic. 

The relentless search for new and cheaper colors produced its own casualties. The Empress aldehyde green was swept aside by iodine green, methyl green, malachite green, and so on. Natural dyes were also falling by the wayside. Canary Island farmers who raised cacti for tiny cochineal beetles were bankrupted 70,000 of the dried beetles made only 1 pound of crimson dye, and the new synthetic colors were much cheaper. 

Aldehydes Green (a) Dun (b) Yellow (b) Marrowfat (b) Meath Park (a) Wilkie (a)... 

R = H Aldehydic, green, grassy, ozonic, slightly metallic, cuminic, very powerful, aggressive. 

R = Me2CH Aldehydic, green, citrus, ozone, cyclamen aldehyde, metallic, Bourgeonal but weaker. 

Undecanal undeca= 11 carbons, /= aldehyde). Green, fatty, floral-... 

Ungaro (Ungaro 1977) Chypre patchouli aldehydic green White Diamonds (Arden 1992)... 

Aldehydic green, slightly fruity somewhat green apple-like... 

Zhang Y, Zhao G, Zhang Y, Huang X. Highly efficient visible-hght-driven photoelectro-catalytic selective aerobic oxidation of biomass alcohols to aldehydes. Green Chem. 2014 16 3860-3869. 

In a more elaborate and specific synthesis, the terpenoid indole skeleton found in haplaindole G, which is isolated from a blue-green alga, was constructed by addition of a nucleophilic formyl equivalent to enone 6.5A. Cyelization and aromatization to the indole 6.6B followed Hg -catalysed unmasking of the aldehyde group[6]. 

The central carbon atom is derived from an aromatic aldehyde or a substance capable of generating an aldehyde during the course of the condensation. Malachite green is prepared by heating benzaldehyde under reflux with a slight excess of dimethyl aniline in aqueous acid (Fig. 2). The reaction mass is made alkaline and the excess dimethylaniline is removed by steam distillation. The resulting leuco base is oxidized with freshly prepared lead dioxide to the carbinol base, and the lead is removed by precipitation as the sulfate. Subsequent treatment of the carbinol base with acid produces the dye, which can be isolated as the chloride, the oxalate [2437-29-8] or the zinc chloride double salt [79118-82-4]. 

Malachite green (0.0...2.0) uracil derivatives, triazine herbicides [163] polar lipids [246, 247] phospholipids [248, 249] fatty acids, fatty aldehydes, phospholipids and glycolipids [250] microbiocidal isothiazolones [251]... 

A green chemistry variation makes use of solventless conditions to minimize the waste stream from reactions of this type. To a mortar are added aldehyde 67, ketone 68 and solid sodium hydroxide. The mixture is ground and within 5 minutes aldol product 69 is produced. Addition of the second ketone and further grinding affords the 1,5-diketone 70, which can be isolated and cyclized to pyridine 71 with ammonium acetate. The authors report that this method can substantially reduce the solid waste (by over 29 times) and is about 600% more cost effective than previously published procedures. 

BerL Ber., abbrev. (Berliner Berichte) Berickte der deutscken chemiachen Gesellscka/t. Berliner-blau, n. Berlin blue, Prussian blue, -blaus ure, /. hydrocyanic acid, -braun, n. Prussian brown, -griin, n. Prussian green, -rot, n. Berlin red (a red lake color), -saure,/. prussic acid, -weiss, n. a kind of white lead. Bernstein, m. amber. — schwarzer —, jet. Bernstein-, amber succinic, succinyl, succino-. -alaun, m. aluminous amber, -aldehyd, n. succinaldehyde. bemateinartig, a. amber-like. 

To a solution of 34.6 mmol of lithium 1 -(dimethylamino)naphthalenide34 in THF at — 60°C are added dropwise 3.20 g (15.7 mmol) of l-methylene-2-phcnylthiocyclohexane in 20 mL of THF. The color of the solution changes from dark green to brown when the reagent is consumed yield >90% (estimated from the yield of aldehyde adducts). 

Other than energy considerations, on which there is little comparative data, the most important green role for photochemistry is in improving atom economy. Although only a preliminary research result, an excellent example of this is the avoidance of the need for stoichiometric amounts of Lewis acid catalysts in the synthesis of some acylated aromatic compounds. Benzoquinone can be reacted with an aldehyde under a sunlamp to yield an acylhydroquinone in up to 88% yield. The alternative procedure would involve reaction of an acyl chloride with hydroquinone and a... 

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