What Are Compounds

Problem 18.27 Condensation of C H NH with CtH5CH=0 yields compound (A), which is hydrogenated to compound (B). What are compounds (A) and (B) M... 

Catalytic hydrogenation of 3-chlorotetrafluoropyridine gives compound G, and reduction of the same starting material with complex hydrides gives compound H. What are compounds G and H ... 

Chlorotrifluoroethylene reacts with oxygen to form compound K, which rearranges to compound L. The same compound L is also generated when a mixture of chlorotrifluoroethylene and oxygen is irradiated by ultraviolet light. What are compounds K and L ... 

Treatment of potassium thiophenoxide with dichlorodifluoromethane in dimethylformamide (DMF) affords three products, Y, Y, and Y". What are compounds Y, Y, and Y", and how are they formed ... 

What are compounds that give the spectra in Figures 2.51 to 2.53 (Problans 2.8-2.10, respectively) ... 

PRACTICE PROBLEM 21.6 What are compounds A and B in the following sequence ... 

So what are compounds and elements Just more of the anatomy of matter. Matter is made up of either pure substances or mixtures of pure substances, and substances themselves are made up of either elements or compounds. (Chapter 2 dissects the anatomy of matter. And, as with all matters of dissection, it s best to be prepared — with a nose plug and an empty stomach.)... 

Dimethyl-2-butene and 2,5-dimethylhexadiene have absorption peaks at 192 and 243 nm in the ultraviolet. Which peak corresponds to which compound What are the approximate HOMO-LUMO separations in electron volts ... 

The high acidity of superacids makes them extremely effective pro-tonating agents and catalysts. They also can activate a wide variety of extremely weakly basic compounds (nucleophiles) that previously could not be considered reactive in any practical way. Superacids such as fluoroantimonic or magic acid are capable of protonating not only TT-donor systems (aromatics, olefins, and acetylenes) but also what are called (T-donors, such as saturated hydrocarbons, including methane (CH4), the simplest parent saturated hydrocarbon. 

Compound A (C4H10) gives two different monochlondes on photochemical chlorination Treatment of either of these monochlondes with potassium tert butoxide in dimethyl sulfoxide gives the same alkene B (CaHg) as the only product What are the structures of compound A the two monochlondes and alkene B2... 

Two different compounds having the molecular formula CgHi5Br are formed when 1 6 dimethylcyclohexene reacts with hydrogen bromide in the dark and in the absence of peroxides The same two compounds are formed from 1 2 dimethylcyclohexene What are these two compounds ... 

Compounds A and B are isomers of molecular formula C9Hi9Br Both yield the same alkene C as the exclusive product of elimination on being treated with potassium tert butoxide in dimethyl sulfoxide Hydrogenation of alkene C gives 2 3 3 4 tetramethylpentane What are the structures of compounds A and B and alkene C2... 

Sabinene and carene are isomeric natural products with the molecular formula CjoHig (a) Ozonolysis of sabinene followed by hydrolysis in the presence of zinc gives compound A What IS the structure of sabinene" What other compound is formed on ozonolysis" (b) Ozonoly SIS of A carene followed by hydrolysis in the presence of zinc gives compound B What is the structure of A carene" ... 

Compounds A and B are isomenc diketones of molecular formula CgHjQ02 The H NMR spectrum of compound A contains two signals both singlets at 8 2 2 (six protons) and 2 8 (four protons) The H NMR spectrum of compound B contains two signals one at 8 1 3 (triplet six protons) and the other at 8 2 8 (quartet four protons) What are the structures of compounds A and B" ... 

The carbon-carbon bond forming potential of the aldol condensation has been extended beyond the self condensations described in this section to cases in which two different carbonyl compounds react m what are called mixed aldol condensations... 

When compound A is heated two isomeric products are formed What are these two products ... 

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 development of precise and reproducible methods of sensory analysis is prerequisite to the determination of what causes flavor, or the study of flavor chemistry. Knowing what chemical compounds are responsible for flavor allows the development of analytical techniques using chemistry rather than human subjects to characterize flavor (38,39). Routine analysis in most food production for the quaUty control of flavor is rare (40). Once standards for each flavor quaUty have been synthesized or isolated, they can also be used to train people to do more rigorous descriptive analyses. 

When compound B is dissolved in FSO3H at —78°C, the NMR spectrum shows that a carbocation is formed. If the solution is then allowed to warm to — 100°C, a different ion forms. The first ion gives compound C when quenched with base, while the second gives D. What are the structures of the two carbocations, and why do they give different products on quenching ... 

List several chemicals that are ozone depleting substances. Why are we concerned with regulating these chemical compounds, and what are the regulations that address them ... 

When 2-heptyne was treated with aqueous sulfuric acid containing mercury(Il) sulfate, two products, each having the molecular formula C7H14O, were obtained in approximately equal amounts. What are these two compounds ... 

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