Addition reactions diene conjugation

Several types of Pd-catalyzed or -promoted reactions of conjugated dienes via TT-allylpalladium complexes are known. The Pd(II)-promoted oxidative difunctionalization reactions of conjugated dienes with various nucleophiles is treated in Chapter 3, Section 4, and Pd(0)-catalyzed addition reactions of conjugated dienes to aryl and alkenyl halides in this chapter. Section 1.1.1. Other Pd(0)-catalyzed reactions of conjugated dienes are treated in this section. 

Interactive to use a web-based palette to predict products from electrophilic addition reactions to conjugated dienes. 

Cyclic carbodisilanes undergo addition reactions with conjugated dienes with splitting of their Si—Si bond. l,l,2,2-Tetramethyl-l,2-disila-cyclopentane reacted with butadiene by the catalysis of PdCI2(PPhs)2 at 100°C to give l,l,5,5-tetramethyl-l,5-disilacyclotrideca-7,ll-diene (70) in... 

Formation of O- and N-heterocycles by Pd-catalyzed intramolecular 1,4-addition reactions of conjugated dienes 92PAC429. 

The amount of 1,2- and 1,4-addition products formed in the electrophilic addition reactions of conjugated dienes depends greatly on the reaction conditions. 

Many Pd -catalyzed 1,4-addition reactions to conjugated dienes used for organic syntheses are described by J.-E. Backvall and co-workers, e. g., A. M. Castano, B. A. Person, J.-E. Backvall, Chem. Ear. J. 1997, i, 482 and references therein. 

Section 8.6 Electrophilic Addition Reactions of Conjugated Dienes... 

Among the techniques for C—C bond constmction, the Diels—Alder reaction has attained a preeminent position. It is a conjugate addition reaction of conjugated dienes to substituted alkenes, commonly called dienophiles, to form a substimted cyclohexene system (Fig. 14.10). The simplest example is the reaction of 1,3-butadiene with ethene to produce cyclohexene. 

Under thermodynamic (relatively high energy) conditions, the more stable product is the major compound formed in addition reactions with conjugated dienes. Under kinetic conditions, the major product comes from 1,2-addition—even if it is the less stable product. Why Proximity In the formation of the allyl cation, the nucleophile is born closer to the 2-position than to the 4-position. 

When a,j8-unsaturated aldehydes and ketones react with nucleophilic reagents, they may do so in two ways. They may react by a simple addition, that is, one in which the nucleophile adds across the double bond of the carbonyl group or they may react by a conjugate addition. These two processes resemble the 1,2- and the 1,4-addition reactions of conjugated dienes (Section 13.10) ... 

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