Light alcohol protection

Properties Apple-green crystals. Very soluble in water insoluble in alcohol. Protect from light, 11% iron. 

Trihydraie. yellow cryst powder. Lo<>e NHjOn exposure to air and Light, Decomposes on heating. Freely sol in water practically insol in alcohol. Protect from tight. 

Dihydrochloride, C H NjO HCl, white ot slightly yellow crystals or powder. Freely sol in waier or alcohol. Protect from light. 

Prepn Weinland, Re i hi in, Ber. 46, 3144 (1913) Starke, J. Inorg, Nucl. Chem. 25, 823 (1963), May contain l or 2 HjO, Red or yellow microcryst powder. Readily hydrolyzed to basic formates. Sol in water very slightly sol in alcohol. Protect from light. 

Dark brown, lustrous granules or brown powder. Characteristic odor and taste. Affected by light. Freely sol in water, yielding neutral or alkaline solns. Practically insol in alcohol. Protect from light... 

Bisulfate, C,H.NO,S, white to grayish-white, crystalline powder- mp 163-165. Freely sol in water one gram dissolves in 50 ml cold, in 9 m] boiling abs alcohol. Protect from light. 

Brownish-black, heavy, odorless powder, dj5 7.22, Bellas to dec at about 200° and at 250-300° decompn is rapid it also breaks up into its constituents in sunlight. Reduced by hydogen, carbon monoxide and most metals. Moist silver oxide absorbs carbon dioxide. Sol in 40,000 parts water freely sol in dil nitric acid, in ammonia somewhat sol in NaOH solns practically insol in alcohol. Protect from light. LD Orally in rats 2.82 g/kg, H F. Smyth et ah. Am. Ind. ffyg. /Issue. J. 30, 470 (1969). 

Violet, cryst powder dec in light, d 4 49 Soly in water at room temps about 9 g/1. More sol in hot water dec by alcohol. Protect from tight. 

Vitamin is iasoluble ia water and is soluble ia 70% alcohol, cbloroform, petroleum ether, ben2ene, and hexane. Vitamin is stable ia air but should be protected from light. Although unstable ia alkaU, the vitamin is stable ia acidic medium. Its facile decomposition ia basic solution forms the basis of the Dam-Karrer color test. 

Salicylic acid is a beta hydroxy acid. Glycolic acid is an alpha hydroxy acid, as are lactic acid, citric acid, and many others. Hydroxy acids are compounds that are both alcohols and acids at the same time. Hydroxy acids are used as chemical peeling agents. Alpha hydroxy acids can make the skin more sensitive to ultraviolet light by removing the skin s protective outer layers. Some alpha hydroxy acids ... 

An alcoholic solution of GTN, if protected from light, is stable over many months. Most organic nitrates are only slightly soluble in water and under alkaline conditions [56] hydrolyse to give an alcohol and nitrate (Eq. (8)) or undergo a-H elimination to give nitrite (Eq. (9)). 

The protection of alcohols by conversion into light-sensitive ethers is most attractive. Initially, the preparation of 2-nitrobenzyl (nBn) ethers presented a problem, although their potential usefulness as protecting groups, stable under a variety of reaction conditions, that nevertheless are readily photolyzed at >320 nm (see Scheme 2) was recognized immediately. 

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