1.2- Dibromo-3-methylbutane

Isoprene has sometimes been used as a starting matenal in the laboratory synthesis of ter penes In one such synthesis the first step is the electrophilic addition of 2 moles of hydrogen bromide to isoprene to give 1 3 dibromo 3 methylbutane... 

Methyl iso-Propyl Ketone (13, 68) In 80 per cent yields by hydrolysis of 2,3-dibromo-2-methylbutane with Twitchell s reagent. Colonge, Bull. soc. chim. (5) 3, (1936). 

Probiwn 13.46 Use formaldehyde and 2-butanol to prepare l,2-dibromo-2-methylbutane. ... 

Methyl-l-butene l,2-Dibromo-3-methylbutane 3-Methyl-l-butyne... 

Exercise 27-3 The nmr spectrum of the ferf-butyl protons of 3,3-dibromo-2,2-di-methylbutane is shown as a function of temperature in Figure 27-4. Explain the two peaks observed at—64°. Calculate the approximate mean lifetime of the process that causes the lines to coalesce at —33°. 

Reactions with dihalomcthanes, 1,3-dibromopropane, 2,3-dibromobutane, 2,3-dibromo-2-methylpentane, 1,2-dibromocyclohexane, and 2-iodo-2-methylbutane did not produce telluronium salts. The halides were converted to alkenes1. 

---