Introduction to Alkyl Halide Occurrence
Halogens that are containing organic compounds are comparatively rare in terrestrial animals and plants. The thyroid hormones T3 and T4 are exceptions; like is fluoroacetate, in the South African shrub Dichapetalum cymosum, the toxic agent known as "gifblaar". Though, the halogen rich environment of the ocean has produced several interesting natural products incorporating large amounts of halogen. Some instances are displayed below. The ocean is the largest known resource for atmospheric methyl iodide and methyl bromide. In addition, to provide 10-20% of atmospheric methyl chloride, the ocean is also estimated, with other major contributions coming from biomass burning, wood-rotting fungi and salt marshes. Several following biological and chemical processes produce poly-halogenated methanes.
By direct halogenation of hydrocarbons, Synthetic organic halogen compounds are readily presented and by addition reactions to alkynes and alkenes. Like intermediates in conventional synthetic processes many of these have proven helpful. A number of halogen compounds, displayed in the box. Have been employed as pesticides, but in the environment their persistence, once applied, has led to restrictions, which including banning, of use of their in developed countries. Since DDT is an effective and cheap mosquito control agent, underdeveloped countries in Latin America and Africa have experienced a spectacular increment in malaria deaths subsequent its removal, and arguments are made for returning it to restricted use. 2,4,5-T and 2,4-D are usual herbicides that are sold by the majority garden stores. Another organic halogen compounds that have been concerned in environmental damage including the polybromo-biphenyls and polychloro- (PBBs and PCBs), employed as heat transfer fluids and fire retardants; and freons (for example CCl2F2 and other chlorofluorocarbons) employed like fire extinguishing agents and refrigeration gases.
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