Hydrogen halides alkenes

Alkynes react with many of the same electrophilic reagents that add to the carbon-carbon double bond of alkenes Hydrogen halides for example add to alkynes to form alkenyl halides... [Pg.377]

The stereochemistry of addition depends on the details of the mechanism. The addition can proceed through an ion pair intermediate formed by an initial protonation step. Most alkenes, however, react via a complex that involves the alkene, hydrogen halide, and a third species that delivers the nucleophilic halide. This termolecular mechanism is generally pictured as a nucleophilic attack on an alkene-hydrogen halide complex. This mechanism bypasses a discrete carbocation and exhibits a preference for anti addition. [Pg.292]

CHAPTER 4 ELECTROPHILIC Alkene Hydrogen halide Stereochemistry Reference... [Pg.194]

Fig. (a) Symmetrical alkenes (b) unsymmetrical alkenes. Hydrogen Halide... [Pg.111]

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