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Reference.org
Beryllocene
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<p>Beryllocene is an organoberyllium compound with the chemical formula Be(C5H5)2, first prepared in 1959. The colorless substance can be crystallized from <a href="/facts/Petroleum_ether/jt6x9qqJ">petroleum ether</a> in the form of white needles at −60 °C and decomposes quickly upon contact with atmospheric <a href="/facts/Oxygen/acyn6o8r">oxygen</a> and <a href="/facts/Water/0lkXnJPK">water</a>. </p>