Lithium diorganocopper (Gilman) reagents are prepared by treatment of an organolithium compound with copper(I) iodide. Decide what lithium diorganocopper (Gilman) reagent is needed to convert 1-bromopropane into 1-hexene.

Explanation:

Gilman reagent is also known as the Lithium organocuprates. They are used as nucleophiles in the organic synthesis.

Gilman reagent is used for C - C bond formation.

                                                            H    H    H

                                                             |      |      |

              -----→     H  - C -- C -- C -- C =

           (1 bromo propane)                   |      |     |       |

                                                           H     H   H     H

                                                             (1 pentene)

Normally in C--C formation by Gilman reagent, the following reactions takes place :

R -- Br   +    R--R' + R' Cu + Li Br

In 1 pentene, i.e.

(from 1 bromo    (from Gilman reagent)

      propane)

So Gilman reagent is

Organo lithium compound is

1.solid

2.carbon dioxide

3.helium

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