Ammonia attack

Moist ammonia attacks copper, tin, zinc and their alloys. Ammonia is also flammable with flammability limits of 15-28%. 

The nonbonding electron of ammonia attacks the boron atom of boron trifluoride, filling boron s valence shell. 

The dinitrito-salts do not decompose with concentrated acids the salts are mostly soluble in water, and again are more stable than the corresponding cobalt salts, which react easily with acids with replacement of nitro-groups. Ammonia attacks the cobaltic series, forming nitrito-pentammino-salts, whereas very little nitrito-pentammino-iridium salt is produced even on heating the dimtrito-tetrammino-iridium salts with ammonia in a closed tube to 200° C.2... 

Ammonia attacks the tetrachloride differently at various temperatures. At 200° to 250° C. reduction is effected according to the equation 5... 

Note that for the synthesis of heterocyclic compounds one need not have an a-b-c triad in the substrate it is essential that the triad be formed in the course of the reaction with perfluoroolefins. This is natural since substituted thioureas must exhibit the same properties as thiourea itself. This was verified by reference to the reaction of perfluoro-2-methyl-3-isothiocyanatepent-2-ene with ammonia. When ammonia attacks the carbon atom of the N=C=S group, a derivative of thiourea having an a-b-c triad is formed subsequent intermolecular cyclization can occur via an attack of the S-nucleophilic centers at the multiple bond, forming isomeric compound 56 (03UP1). 

A novel pyrido[l,2-6]pyrrolo[2,3-e]-a -triazine (19) is produced when compound (15) is treated with ammonia ammonia attacks the C-lOa carbon and causes ring opening to give the triazinium derivative (18 Nu = NH2) and the amine substituent is then able to react with the carbonyl group of the benzoyl substituent to give the cyclized product (19) in high yield. 

The third reaction is different because it has more than one step. It is a carbonyl substitution the kind we met in Chapter 12. The nucleophile (ammonia) attacks the carbonyl group to fonr. tetrahedral intermediate that decomposes with the loss of the better leaving group. 

This adduct is in equilibrium with the stable enolate from the keto-ester and elimination now gives an unsaturated carbonyl compound. Such chemistry is associated with the aldol reactions we discussed in Chapter 27. The new enone has two carbonyl groups at one end of the double bond and is therefore a very good Michael acceptor (Chapter 29). A second molecule of enolate does a conjugate addition to complete the carbon skeleton of the molecule. Now the ammonia attacks either of... 

Ammonia attacks the carbonyl group in a nucleophilic addition reaction to yield an intermediate carbinolamine. 

CYCLOHEXANONE PEROXIDE (78-18-2) Forms explosive mixture with air (flash point 111 °F/44° cc). A strong oxidizer. May be able to form unstable peroxides in storage and may be sensitive to heat and shock. Reacts violently with combustible materials, reducing agents, organic substances, finely divided metals, caustics, ammonia. Attacks copper and its alloys some plastics. 

Because the odor threshold of ammonia gas is very low (approximately 5 ppm), it provides ample warning properties. Ammonia attacks wet tissue such as the eyes and mucous membranes of the respiratory system. Two types of injuries can result from ammonia spills. One is direct contact, in which the victim is sprayed or splashed resulting in skin bums or loss of vision. Such injuries are often restricted to the immediate surroundings of the release point. Ammonia can also be released as a gas or cloud, which can spread over a wide area... 

It is known that in such a reaction, the ammonia attacks the carbonyl carbon of the formaldehyde by coming in with its electrons pointing toward the carbon, and approximately perpendicular to the plane of the carbonyl systan, as shown in Structure 5 ... 

These cleaners contain ammonia. Like other alkalis, ammonia attacks grease. Since it is a weak alkali it is safe to use in household cleaners. 

Explosion of ammonia vapor is possible, but it can only be ignited with difficulty. Ammonia attacks copper, tin, zinc, cadmium, and their alloys. 

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