Cacodyl

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Cacodyl is an organoarsenic compound with the chemical formula (CH₃)₂As-As(CH₃)₂. It is also known as tetramethyldiarsine. Cacodyl is notable for its extremely unpleasant odor and its toxicity. The compound is a member of the organometallic compounds and is one of the earliest known examples of such compounds.

History

Cacodyl was first synthesized by Robert Bunsen in the 19th century. Bunsen's work with cacodyl was significant in the development of the field of organic chemistry. The name "cacodyl" is derived from the Greek word "kakodes," meaning "stinking," due to its foul smell.

Structure and Properties

Cacodyl consists of two methyl groups (CH₃) attached to each arsenic atom, with the two arsenic atoms connected by a single bond. The compound is highly volatile and flammable. It is also highly toxic, with both acute and chronic exposure posing serious health risks.

Synthesis

Cacodyl can be synthesized through the reaction of potassium acetate with arsenic trioxide in the presence of sulfuric acid. The reaction produces cacodyl oxide, which can then be reduced to cacodyl.

Applications

While cacodyl itself has limited practical applications due to its toxicity, it played a crucial role in the early study of organometallic chemistry. Bunsen's research on cacodyl helped to establish the principles of chemical bonding and molecular structure.

Safety and Handling

Due to its high toxicity and volatility, cacodyl must be handled with extreme care. Proper personal protective equipment (PPE) such as gloves and goggles should be used, and work with cacodyl should be conducted in a well-ventilated area or under a fume hood.

See Also

• Organometallic compound
• Robert Bunsen
• Methyl group
• Potassium acetate
• Arsenic trioxide
• Sulfuric acid