Benzene complexes, hydrocarbon molecules

Write a play. The play should feature a family of hydrocarbon molecules. The father can be Octane, the mother Pentane, and the children Propane and Methane. There can be a complex cousin, 3-Methyl Heptane, and a twisted uncle, Benzene. The characters have personalities dictated by their hydrocarbon properties. Make the setting appropriate for hydrocarbon characters in a sculpture garden. Have the characters bond. Use your imagination. Produce the play for your class. 

Aromatic hydrocarbon molecules may also serve as nucleophilic particles forming hydrogen bonds. Thus, the addition of an equimolar amount of hydrocarbon A to the salts AH AljBrf obtained from toluene or mesitylene increases the integral intensity of the CH -group band by 1.5-2 (see also ). A less basic benzene changes the intensity of this absorption much less. The IR spectra of ethylbraizene complexes with a less-than-equivalent amount of AICI3 and HQ are also described K... 

Fig. 17 Structures of benzene complexes with hydrocarbon molecules...

Tables Intermolecular interaction energies of the complexes formed between benzene and some hydrocarbon and halogenated hydrocarbon molecules ...

Cyclodimer 3 proved to be somewhat difficult to manipulate, thus contributing to the complexity of its characterization. The bowed diacetylenic linkages revealed in the X-ray data impart surprising physical characteristics to the molecule. The energy-rich hydrocarbon was sufficiently strained that it decomposed explosively upon grinding (i. e. preparing a Nujol mull) or when heated above 80°C. At room temperature, crystals blackened within a few days and apparently auto-polymerized, even when stored under vacuum in the dark. Only dilute solutions of 3 in benzene or pyridine were fairly stable over time, especially when stored cold under an inert atmosphere. 

Physical Form. Liquid gasoline is a complex mixture of at least 150 hydrocarbons with about 60-70% alkanes, 25-30% aromatics, and 6-9% alkenes. The small-chain, low-carbon-numbered components are more volatile and thus in higher percentages in the vapor phase than the larger and heavier molecules. The concentrations of aromatics, the more toxic of the components, are depleted to about 2% in the vapor phase. The light alkanes, the less toxic components, are enriched to about 90%. Benzene is also present and represents a component of major concern. 

Tetrakis(triethylphosphine)platinum(0) is extremely air sensitive and readily soluble in saturated aliphatic hydrocarbons. The complex can be stored under dry nitrogen in a freezer (-35°) for several months. The complex readily loses one of the coordinated phosphine molecules to give Pt(PEt3)36 (dissociation constant (K ) in heptane is 3.0 X 10" ). The H NMR spectrum measured in benzene-d6 shows two multiplets at 5 1.56 (CH2) and 1.07 ppm (CH3). Tetrakis-(triethylphosphine)platinum(O) is a strong nucleophile and reacts readily with chlorobenzene and benzonitrile to give a-phenyl complexes PtX(Ph)(PEt3)2 (X = Cl, CN).7 Oxidative addition of EtOH affords [PtH(PEt3)3] +. 

This review deals with metal-hydrocarbon complexes under the following headings (1) the nature of the metal-olefin and -acetylene bond (2) olefin complexes (3) acetylene complexes (4) rr-allylic complexes and (5) complexes in which the ligand is not the original olefin or acetylene, but a molecule produced from it during complex formation. ir-Cyclopentadienyl complexes, formed by reaction of cyclopentadiene or its derivatives with metal salts or carbonyls (78, 217), are not discussed in this review, neither are complexes derived from aromatic systems, e.g., benzene, the cyclo-pentadienyl anion, and the cycloheptatrienyl cation (74, 78, 217), and from acetylides (169, 170), which have been reviewed elsewhere. 

We studied this complexatlon by using as a model of the active lon-palr, the dlcarbazyl Mg, a molecule soluble In hydrocarbons and unable to Initiate the polymerization of 2VP. The preparation of this molecule necessitates the presence of a small amount of THF. From the H NMR spectrum, we determined that 2 THF molecules are complexed with the magnesium cation. Indeed, the Internal chemical shift (A6THF) of the THF ( - = 6 0 -6-ch -) In benzene solution Is equal to 125.4 Hz, whereas, ... 

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