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Fluorine and sulfur- an old combination with a new lease of life

The use of fluorine and fluorine-containing functional groups in medicinal chemistry, agrochemicals and advanced materials has grown over the past fifty years.1 Not surprisingly this increase in utility tracks with notable developments and refinements in safe and accessible synthetic methodology, both on the discovery and development front and in subsequent manufacturing. A recent example that caught

Osmium (Os, Element 76)

Osmium, a group 8 d-block transition metal discovered in 1803 by the English chemist Smithson Tennant, is the rarest of the stable elements. Concentrations in the Earth’s crust are around 50 parts per trillion. The metal is found in nature uncombinrd or alloyed with its neighbour, iridium, in the alloys iridosmine or osmiridium. Around 500Kg

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