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In chemistry, the Verkade base (or Verkade superbase) is a powerful superbase with the formula P(MeNCH 2 CH 2) 3 N. A colorless oil, it is an aminophosphine although its inventor John Verkade called it proazaphosphatrane. The trimethyl derivative or 2,5,8,9-tetraaza-1-phosphabicyclo[3.3.3]undecane is the simplest. [1]
Another type of organometallic superbase has a reactive metal exchanged for a hydrogen on a heteroatom, such as oxygen (unstabilized alkoxides) or nitrogen (metal amides such as lithium diisopropylamide). [23] The Schlosser base (or Lochmann-Schlosser base), the combination of n-butyllithium and potassium tert-butoxide, is commonly cited as a ...
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Ortho-diethynylbenzene dianion (C 6 H 4 (C 2) 2) 2− (the strongest superbase ever synthesized) Meta-diethynylbenzene dianion (C 6 H 4 (C 2) 2) 2− (second strongest superbase) Para-diethynylbenzene dianion (C 6 H 4 (C 2) 2) 2− (third strongest superbase) Lithium monoxide anion (LiO −) was considered the strongest superbase before ...
The Roman army (Latin: exercitus Romanus) was the armed forces deployed by the Romans throughout the duration of Ancient Rome, from the Roman Kingdom (753 BC–509 BC) to the Roman Republic (509 BC–27 BC) and the Roman Empire (27 BC–476 AD), and its medieval continuation, the Eastern Roman Empire.
Roman military borders and fortifications were part of a grand strategy of territorial defense in the Roman Empire, although this is a matter of debate.By the early 2nd century, the Roman Empire had reached the peak of its territorial expansion and rather than constantly expanding their borders as earlier in the Empire and Republic, the Romans solidified their position by fortifying their ...
He went into powerlifting, winning six consecutive California state championships (and seventeen meets overall), logging the first drug-free 800-pound squat in the state’s history, and hitting ...
Momentarily free from his opponents, he concentrated on strengthening his internal position and, above all, his army. His most important innovation was doubtless the introduction of the phalanx infantry corps, armed with the famous sarissa, an exceedingly long spear, at the time the most important army corps in Macedonia.
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