2.3- Dimethylpentane, structure

NAME 3, 3-Dimethylpentane STRUCTURAL FORMULA ch3 ch3ch2c ch2ch3 ch3... 

Example Estimate the autoignition temperature of 2,3-dimethylpentane. Structure and group information ... 

Fig. 9.3. Comparison of chelated bicyclic and nonchelated monocyclic transition structures for addition of allyl trifluorosilane to syn- and tf ft -3-methoxy-2,4-dimethylpentanal based on MNDO computations (a) chelated bicyclic transition structures differ by 6kcal/mol owing to nonbonded interactions in the syn case (b) nonchelated monocyclic transition structures are of comparable energy for both isomers. Reproduced from J. Org. Chem., 68, 1319 (2003), by permission of the American Chemical Society.

The structural formula of a compound not only shows the number of each kind of atom in the molecule, but also how the atoms are joined together. The simplest of these structural formulae is the full structural formula, in which all the bonds between the atoms are displayed. For example, the full structural formula of 2,3-dimethylpentan-3-ol is drawn on the left and alongside it are two abbreviated structural formulae. 

Use the structure-reactivity relationship approach to calculate the rate constants for the reactions of OH with the following compounds and calculate the percentage difference from the recommended values in Table 6.2 (a) ethane, (b) n-butane, (c) 2-methylpen-tane, (d) 2,2-dimethylpentane, (e) 2,2,3-trimethyl-butane, (f) n-nonane, (g) n-decane. 

Figure 6.36 Data for structure H hydrates of methane with 2,2-dimethylpentane, 3,3-dimethylpentane, and 2,2,3-trimethylbutane.

A-10. Draw the structures of all the alkenes, including stereoisomers, that can be formed from the E2 elimination of 3-bromo-2,3-dimethylpentane with sodium ethoxide (NaOCH2CH3) in ethanol. Which of these would you expect to be the major product ... 

A-l. How many different alkenes will yield 2,3-dimethylpentane on catalytic hydrogenation Draw their structures, and name them. 

Due to its structural complexity and interesting physiological activities as an antifungal agent and especially as an immunosuppressive drug, the macrolide rapamycin has been a target of many total syntheses [54-58]. In their approach, Ley and co-workers used a lipase-catalyzed desymmetrization of a meso diol (Fig. 3). In early studies, the selective acetylation of 7W w-2.4-dimethylpentane-1,5-diol was achieved by a PPL immobilized on celite with moderate yields and 92%... 

If a structure has identical substituents, then the prefixes di-, tri-, tetra-, etc. are used to represent the number of substituents. For example, the structure in figure given below is called 2,2-dimethylpentane and not 2-methyl-2-methylpentane. 

Related Calculations. Extensive comparisons between experimental critical properties and those estimated by several other methods have shown that the Lydersen group-contribution method is the most accurate. This method is relatively easy to use for both hydrocarbons and organic compounds in general, provided that the structure is known. Unlike Nokay s correlation (see Example 1.2), it can be readily applied to hydrocarbons containing characteristics of more than a single family, such as an aromatic with olefinic side chains. A drawback of the Lydersen method, however, is that it cannot distinguish between isomers of similar structure, such as 2,3-dimethylpentane and 2,4-dimethylpentane. 

Write structural formulas for the following organic compounds (a) 3-methylhexane, (b) 1,3,5-trichloro-cyclohexane, (c) 2,3-dimethylpentane, (d) 2-phenyl-4-bromopentane, (e) 3,4,5-trimethyloctane. 

Figure 4 The structural formula for 3,3-dimethylpentane and the numbered hydrogen-suppressed graph.

Intramolecular oxidation proceeds with unusual facility in dimethyl-pentane compared with most other simple normal and branched alkanes because of structural and kinetic features that are particularly favorable. In the following reaction scheme (where HRH is dimethylpentane)... 

J. A. Structure H hydrate A single crystal diffraction study of 2,2-dimethylpentane.5(Xe,H2S).34H20. Supramol. Chem. 1997. 8. 173-176. 

FIGURE 2. Structures and skeleton formulas of (a) 2,4-dimethylpentane and (b) 3,3-dimethylpentane. The numbers associated with each vertex in the chemical graph give the number of (adjacent) bonded skeletal neighbors... 

Draw a structure for each alkane. (a) 2-methylbutane (b) 3-ethyl-2-methylhexane (c) 3-isopropylheptane (d) 2,5-dimethyloctane 46. Draw a structure for each alkane. (a) 3-ethylhexane (b) 3,3-dimethylpentane (c) 3-ethyl-3-methylpentane (d) 4,4-diethyloctane... 

---