CC14

Carhon tetrachloride Tetrachloroniethane 193 CC14 Methyl ethyl sulfide 2-Thiabutane 188 CiHgS... 

Dissolves in HC1 HN03 Cone. H2SC>4 Ethanol Chloroform CC14 CH3COOH Cone. HN03 Cone. HC1 Hot H2SQt Chloroform CC14 CS2... 

A flask of gaseous CCL, was weighed at a measured temperature and pressure. The flask was flushed and then filled with oxygen at the same temperature and pressure. The weight of the CC14 vapor will be about... 

Despite this qualitative similarity, the solubility of iodine in CC14 is very different from its solubility in alcohol. One liter of alcohol dissolves 0.84 mole of iodine, whereas one liter of CCli dissolves only 0.12 mole ... 

The heat of solution of iodine in benzene is +4.2 kcal/mole (heat is absorbed). Assuming the increase in randomness is the same when iodine dissolves in liquid benzene as it is in ethyl alcohol and in CC14, justify the prediction that the solubility of I2 in benzene is higher than in CC14 but lower than in alcohol. 

More complicated molecules, with two or more chemical bonds, have more complicated absorption spectra. However, each molecule has such a characteristic spectrum that the spectrum can be used to detect the presence of that particular molecular substance. Figure 14-17, for example, shows the absorptions shown by liquid carbon tetrachloride, CCfi, and by liquid carbon disulfide, CS2. The bottom spectrum is that displayed by liquid CC14 containing a small amount of C. The absorptions of CS2 are evident in the spectrum of the mixture, so the infrared spectrum can be used to detect the impurity and to measure its concentration. 

Predict the order of increasing melting point of these substances containing chlorine HC1, d2, NaCl, CC14. Explain the basis of your prediction. 

A mixture of pyrimidine-4,5-diamine (5.5 g, 50 mmol), ethyl acetoacetate (9.75 g, 75 mmol), ZnCl2 (0.275 g) and EtOH (400 mL) was refluxed for 8 d and then evaporated under reduced pressure. The residue was extracted with boiling CC14 (700mL) and the extract was cooled to give 14 yield 6.18g (56%) mp 150-151.5 C. 

A solution of 1 l,12-dihydrodibenzo[r,g][l,2]diazocine (1 1.5 g, 7.1 mmol) in CC14 (120mL) was stirred with NBS (1.5 g. 8.43 mmol) and refluxed for 12 h. The mixture was cooled and filtered, the filtrate was evaporated to dryness, and the resulting dark residue was extracted with boiling cyclohexane (100 mL). The extract was decolorized with charcoal and the filtrate was evaporated to dryness to afford crude 11-bromo-l l,12-dihydrodibenzo[c,g][l,2]diazocine (2) yield 1.1 g (54%) mp 105-106 C (after recrystallization from cyclohexane). 

Method A 1. NBS, DBPO, CC14, reflux, 1 h 2. NaCH(C02Et)2, EtOH, reflux ... 

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