Introduction 817 2. Addition of C-Ni Species to Unactivated Olefins and Acetylenes 818 2.1. Reaction of olefins and acetylenes with external organometallics 818 2.2. Sequential additions of C-Ni species to olefins and acetylenes 820 2.3. Ni-catalyzed Zn-halogen exchange of alkyl halides and addition to olefins and acetylenes 824 2.4. Addition to olefins and acetylenes of C-Ni species generated from chemical reduction of halides 826 2.5. Addition to olefins and acetylenes of C-Ni species generated from electrochemical reduction of halides 829 3. Addition of HCN to Acetylenes and Olefins 829 3.1. Addition of HCN to acetylenes 829 3.2. Ni-catalyzed addition of HCN to olefins 830 3.3. Ni-catalyzed asymmetric hydrovinylation reaction 831 4. Substitution of Allylic Systems by Organometallics 833 4.1. Substitution of allyl ethers, carbonates and amines 833 4.2. Substitution of allyl halides 837 5. [nΟ©m] Cycloadditions 837 6. Ni-Catalyzed Conjugate Addition Reactions 838 6.1. Alkyl organo-nickel additions to enones 838 6.2. Ni-catalyzed additions to enones by -ate complexes 841 7. Conclusion