There are three main types: (1) the alkyl derivatives of Group IA and IIA metals of the periodic table (including Grignard reagents), which have ionic bonds, and are powerful bases and reducing agents (see reduction); (2) derivatives of other main group metals, which are volatile, covalently-bonded compounds; and (3) transition metal derivatives (including sandwich compounds) with special d-orbital bonding.
Organometallic compounds are prepared by reacting a metal with an alkyl halide or a reactive hydrocarbon, or by substitution.
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• ORGANIC CHEMISTRY
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