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Extracting the product after a diazonium coupling reaction using diethyl ether and water.
Diazonium coupling is a reaction used to introduce a functional group via electrophilic substitution to an aromatic ring system, such as naphthalene in this case. In this reaction, methylferrocene was coupled to 6-amino-2-naphthenyl-methyl-ester.
A diazonium salt needs to be prepared for the reaction ‘in situ’, since the intermediate compound is too unstable to store. Once the salt is being prepared, it must not be allowed to reach a temperature above 5°C, or else the N+≡N group rapidly decomposes into N2 gas and may cause an explosion due to the rapid increase of pressure within the flask.
A partial lunar eclipse at Moonrise is photographed in a multi-exposure image from Port Hedland, Western Australia.
Top - Malayan Forest Gecko (Cyrtodactylus pulchellus)
Center/Bottom - Crested Gecko (Correlophus ciliatus)
Why do geckos (and some other terrestrial lizards) lick their eyeballs?
Wouldn’t you, if you could? I sure would. Other than the fact that they have cool long tongues, geckos (and many of their terrestrial brethren) have non-functional eyelids, but rely strongly on their eyesight. In order to maintain their vision, they lick their eyes!
Several mammals, such as okapi and giraffe, also lick their eyes, though they still have functional eyelids.
Unrelated cool fact! "Eyelash geckos", otherwise known as crested geckos, were once thought to be extinct! In 1994, however, they were re-discovered in a southern province of New Caledonia. They bred easily in captivity, and are now one of the most popular pet reptiles.
This is brilliant.