Pentaborane ll

Most of these reactions are reversible. Thus, heating tetraborane(lO) in the presence of a large excess of hydrogen reforms diborane. Pentaborane(ll) is thermally... 

Diborane(6) and tetraborane(lO) are colorless gases at ambient temperature and pressure. Diborane has a repulsive odor. Higher boranes up to nine boron atoms are colorless hquids. Decaborane(14) is a colorless crystalline solid. Pentaborane(ll) andhexaborane(12) are unstable compounds. The densities and melting and boiling points of selected boron hydrides are shown in the following table ... 

Boron Compounds. Molecular hydrides of boron are called boranes. They are named by using a multiplying affix to designate the number of boron atoms and adding an Arabic numeral within parentheses as a suffix to denote the number of hydrogen atoms present. Examples are pentaborane(9) for B5H9 and pentaborane(ll) for B5Hn. 

Pentaborane(ll), 0189 Pentacarbonylmanganese hydride, 1808b Pentachloroethane, 0656 Pentacyclo[4.2.0.02,5.03 8.04 7]octane, 2936b f 1,2-Pentadiene, 1889... 

Two specifically deuterated tetraborane(lO) derivatives have been prepared. Degradation of pentaborane(ll) by D2O 147.148) gives 95—97% yields of bridge monodeuterated tetraborane(lO). Unsymmetrical cleavage is suggested as a possible mechanism ... 

The reaction of B4H8CO (enriched in either boron-10 or boron-11) with diborane(6) (enriched in the other isotope) produces pentaborane(ll)... 

Although tetraborane(8) has not been isolated, it is known from its trifiuorophosphine and dimethylaminodifluorophosphine adducts. The former complex can be made directly from pentaborane(ll) and the... 

A new route to pentaborane(9), free from pentaborane(ll) by-products, involves the preparation of a halogenated octahydroborate anion [reaction (1)]. 

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