Methyllithium, electrostatic potential

Methyllithium, electrostatic potential map of, 37, 143 polar covalent bond in. 37 Methylmagnesium chloride,... 

Figure 14 1 uses electrostatic potential maps to show how different the electron distri bution IS between methyl fluoride (CH3F) and methyllithium (CH3L1)... 

Problem 1.8 concerned the charge distribution in methane (CH4), chloromethane (CH3CI), and methyllithium (CH3Li). Inspect molecular models of each of these compounds, and compare them with respect to how charge is distributed among the various atoms (carbon, hydrogen, chlorine, and lithium). Compare their electrostatic potential maps. 

FIGURE 14.1 Electrostatic potential maps of (a) methyl fluoride and ( >) methyllithium. The electron distribution is reversed in the two compounds. Carbon is electron-poor (blue) in methyl fluoride, but electron-rich (red) in methyllithium. 

Two electrostatic potential maps, one of methyllithium (CH3Li) and one of chloromethane (CH3C1) are shown. Based on their polarity patterns, which do you think is which ... 

The electrostatic potential map (EPM) of methyllithium is shown at left. The blue (electron-poor) color of the metal results from its partial positive charge, and the red (electron-rich) color of the methyl group shows its partial negative charge. 

Electrostatic potential maps of methyl chloride and methyllithium, clearly indicating the inductive effects. 

Electrostatic potential maps of (a) methyllithium, (b) methylcopper. and (c) methyl fluoride. The color range is the same in all three maps The C-Li and C—F bonds are oppositely polarized. The C—Cu bond is the least polar. 

FIGURE 2.3 (a) Methanol, CHjOH, has a polar covalent C-O bond, and (b) methyllithium, CHjLi, has a polar covalent C-Li bond. The computergenerated representations, called electrostatic potential maps, use color to show calculated charge distributions, ranging from red (electron-rich S-) to blue (electron-poor 5-L). 

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