Hydrochlonc acid

Cineole is the chief component of eucalyptus oil it has the molecular formula CjoHigO and contains no double or triple bonds It reacts with hydrochlonc acid to give the dichlonde shown... 

Hydrolysis of a compound A in dilute aqueous hydrochlonc acid gave (along with methanol) a compound B mp 164—165°C Compound B had the molecular formula CigHig04 it exhibited hydroxyl absorption in its IR spectrum at 3550 cm but had no peaks in the carbonyl region What IS a reasonable structure for compound B" ... 

When the compound shown was heated in refluxing aqueous hydrochlonc acid for 60 hours a product with the molecular formula C5H6O3 was isolated in 97% yield Identify this product Along with this product three other carbon containing substances are formed What are they" ... 

The structure of compound A was established in part by converting it to known compounds Treat ment of A with excess methyl iodide in the presence of silver oxide followed by hydrolysis with dilute hydrochlonc acid gave a tnmethyl ether of D galactose Companng this trimethyl ether with known trimethyl ethers of D galactose allowed the structure of compound A to be deduced... 

Hydrolysis of the following compound in concentrated hydrochlonc acid for several hours at 100°C gives one of the amino acids in Table 27 1 Which one" Is it optically active" ... 

Apply bands of sample solution, overspray with [35] 12% hydrochlonc acid, leave in an atmosphere of nitrogen for 2 imn and then dry in a stream of nitrogen, then chromatograph The vinyl ether linkages in the phosphatides are hydrolyzed... 

Sulfonamides, 1,2-di-acetylhydrazine, procaine, benzocaine, etc Apply samples and dry, place TLC plate in a twin-trou chamber with fuming hydrochlonc acid and heat to 100°C Then remove the acid in a stream of cold air and chromatograph [39]... 

Chloro-, hydroxy-, and methoxybenzaldehyde denvatives Denvatize with 2,4-dinitrophenylhydrazine solution in hydrochlonc acid Heat to 80 °C, cool and chromatograph [83]... 

A-Fluoro-2,4,6-tnmethylpyndmium inflate (1 mmol) is added m several portions at room temperature to a tetrahydrofuran solution of sodium diethyl phenyl-malonate, obtained from 1 mmol of diethyl phenyl malonate and sodium hydnde at 0 C in tetrahydrofuran The reaction imxture is poured mto dilute hydrochlonc acid and extracted with ether The ether extract is washed with sodium bicarbonate and water and dned over magnesium sulfate The oily residue obtamed after removal of tihe ether is chromatographed on sihca gel (dichloromethane-hexane, 1 1) to give diethyl fluorophenylmalonate in 83% yield... 

Apply bands of sample solution containing ca [36, 37] 25 ig glycoside, cover the layer, apart from the application zones, with a glass plate and place in a chamber over the vapors of 37% hydrochlonc acid, allow to react and chromatograph after the removal of excess hydrochlonc acid... 

C 5 -Methoxycyclohexan -one 3 4 -diLarboxvlic acid anhydride To 3 00 g (0 174 mol) of 1 methoxy-3-trimethylsiloxy-l, 3-bu-tadiene at 0°C (ice bath) is added a total ot 980 mg (0 01 mol) of freshly sublimed maleic anhydride in portions of 70-80 mg each over a period of 25 min When the addition is complete, the ice bath is removed and the clear solution is stirred for 15 mm at room temperature (Note 7) Three 5-mL portions of a solution of tetrahydrofuran (35 mL) and 0 1 N hydrochlonc acid (15 mL) are added and the solution is stirred for 1 min The remaining acid solution (35 mL) is added all at once and the resulting solution IS poured into 100 mL of chloroform and treated with 25 mL of water The organic layer is separated and the aqueous layer is extracted four times with 100-mL portions of chloroform The extracts are combined and dned over anhydrous magnesium sulfate The solvent is then removed under reduced pressure (Note 8) to provide 2 0 g of an oil which solidifies Pentane (10 mL) is added to the oily solid and small portions... 

Flavone, cumann and tnterpene glycosides, solamargine, solasomne Spray the sample zone with 10% ethanolic hydrochlonc acid Then expose to the vapors of cone hydrochloric acid — ethanol (1 + 1) in a twin-trough chamber, heat to 50 to 55 °C for 4 to 5 h. [16]... 

As already mentioned, G N Lewis came to the conclusion (though he afterwards modified the conclusion, cf Journ Amer Chem Soc, 39> 2258 (1917)) that hydrochlonc acid and the alkali chlorides have the same degree of ionisation at the same concentiation This was based upon the relation—... 

The classic photo-catalytic reaction is that of the union of hydrogen and chlorine to form hydrochlonc acid, according to the reaction—... 

From the sodium, potassium, ferric or barium salt (after boiling with sulfuric acid) with p-toluidme and hydrochlonc acid... 

From the sodium or the potassium salt of the sulfonic acid with o-toluidine and hydrochlonc acid in water For directions and examples see Cheronis, p 637,0 C DermerandV H Dermer, 7 Org CAem, 7, 581 (1942)... 

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