The alkyl magnesium halides described in the second reaction are called grignard reagents after the french chemist victor grignard who discovered them and received the nobel prize in 1912 for this work. The reaction of an organic halide with magnesium is not a grignard reaction but provides a grignard reagent. As alchimista pointed out thf is just one of the possible solvents you can use if ether fails or gives poor yields.
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