TABLE 1-3 Average Bond Energies and Bond Lengths of Single and Multiple Bonds SINGLE BOND DOUBLE BOND TRIPLE BOND ENERGY LENGTH ENERGY LENGTH ENERGY LENGTH Atoms Bonded kJ kcal picometers kJ kcal kJ kcal Together mol mol (pm) mol mol pm mol mol pm C-C 339 81 154 619 148 134 812 194 120 C-N 289 69 147 619 148 129 891 213 116 C-0 351 84 143 720 172 120 1072 256 113 N-N 159 38 145 418 100 125 946 226 110 0-0 138 33 148 498 119 121
Basics in Organic Reactions Mechanisms
In organic chemistry, the mechanism of an organic reaction is defined as a complete step-by-step explanation of how a reaction of organic compounds happens. A completely detailed mechanism would relate the first structure of the reactants with the last structure of the products and would represent changes in structure and energy all through the reaction step.
Heterolytic Bond Breaking
Heterolytic bond breaking is also known as heterolysis or heterolytic fission or ionic fission. It is defined as breaking of a covalent bond between two different atoms in which one atom gains both of the shared pair of electrons. The atom that gains both electrons is more electronegative than the other atom in covalent bond. The energy needed for heterolytic fission is called as heterolytic bond dissociation energy.
Polar Aprotic Solvent
Solvents that are chemically polar in nature and are not capable of hydrogen bonding (implying that a hydrogen atom directly linked with an electronegative atom is not found) are referred to as polar aprotic solvents. Some commonly used polar aprotic solvents are acetone, DMF, acetonitrile, DMSO, etc.
Oxygen Nucleophiles
Oxygen being an electron rich species with a lone pair electron, can act as a good nucleophile. Typically, oxygen nucleophiles can be found in these compounds- water, hydroxides and alcohols.
Carbon Nucleophiles
We are aware that carbon belongs to group IV and hence does not possess any lone pair of electrons. Implying that neutral carbon is not a nucleophile then how is carbon going to be nucleophilic? The answer to this is that when a carbon atom is attached to a metal (can be seen in the case of organometallic compounds), the metal atom develops a partial positive charge and carbon develops a partial negative charge, hence making carbon nucleophilic.
Diazomethane has the formula H2CN2. Draw all valid resonance contributors for diazomethane and, using Table 1-3, propose which one contributes more to the resonance hybrid. Hint: There are no structures that avoid charged atoms.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 1 images
