(1) Reaction with Na: Diborane reacts with sodium amalgum
to form an addition product B2H6Na2.
(2) Reaction with air: the reaction of diborane
with oxygen is highly exothermic and due to evolution of enormous amount of
heat energy it can use as industrial fuel and propellants and not use as
domestic due to its poisonous nature.
(3) Thermal Stability: B2H6
stable only at low temperature when heated 100 to 250 degree it changes into
higher hydrides and On heating to 700ºC diborane dissociates.
Note: - Formation of B2H2Cl4
shows that the 2H left in B2H2Cl4
are responsible for dimmer formation (Bridge bond). Diborane
has only four replaceable hydrogen and with their replacement, the
dimeric structure continuous to be as such. Remaining two hydrogen when they get displaced, the
dimeric structure break indicating that these two hydrogen
are act as bridging hydrogen.
(8) Reaction with Ammonia (NH3):
(1) Diborane react with excess NH3 at
temperature to form boron nitride (BN) x.while
when diborane and NH3 react in 1:2 ratios
at low temperature give Borazole.
(2) Diborane is electron-deficient molecule
and hence it reacts with several molecules having lone pair(s) of electron like
CO, ether, amines, to form complex compounds.
(3) B2H6
give symmetrical cleavage with respect to only large size
and weak amines CO, H¯, N(CH3)3 , THF, PH3,
PF3 , OEt3 OMe2 ,Pyridine, Thiophene ,SMe2,
Set3 etc.
(4) In the presence of small
and strong base B2H6 undergo unsymmetrical cleavage like NH3, H2N (CH3),
HN (CH3)2 etc
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