72 research outputs found
Definitive crystal structure of 1,1'-bis[1,2-dicarba-<i>clos</i>o-dodecaborane(11)]
In the title compound, C4H22B20, the two {1,2-closo-C2B10H11} cages are linked across a centre of inversion with a CβC distance of 1.5339β
(11)β
Γ
. By careful analysis of the structure, it is established that the non-linking cage C atom is equally disordered over cage vertices 2 and 3
Crystal structure of 1,1'-bis[1,7-dicarba-<i>closo</i>-dodecaborane(11)]
In the title compound, C4H22B20, the two {1,7-closo-C2B10H11} cages are linked across a centre of inversion, with CβC = 1.5401β
(16)β
Γ
. The position of the second non-linking cage C atom was established unambiguously by geometric and crystallographic methods and there is no evidence of C/B disorder
Steric <i>versus</i> electronic factors in metallacarborane isomerisation: nickelacarboranes with 3,1,2-, 4,1,2- and 2,1,8-NiC<sub>2</sub>B<sub>9</sub> architectures and pendant carborane groups, derived from 1,1β²-bis(o-carborane)
Nickelacarborane derivatives of 1,1β²-bis(o-carborane) allow comment on the factors important in the isomerisation of metallacarboranes.</p
Silver Effect in Regiodivergent Gold-Catalyzed Hydroaminations
We
report a silver-induced switching of regioselectivity in gold-catalyzed
reactions, and we provide mechanistic evidence to suggest a true βsilver
effectβ: that is, one that is implicated in the catalytic process
itself, via Ο-gold Ο-silver acetylides. These results
are of significance because they clearly show that the use of silver
as halide abstractors in gold-catalyzed reactions may result in βsilver
effectsβ when terminal alkyne substrates are involved
Developing nitrosocarborane chemistry
New nitrosocarboranes or their hydroxylamine or DielsβAlder cycloadducts have been prepared and fully characterised.</p
Double deboronation and homometalation of 1,1'-bis(ortho-carborane)
Diastereomeric diruthenium and dicobalt species derived from double deboronation and metalation of 1,1β²-bis(ortho-carborane) have been prepared and characterised.</p
Unprecedented flexibility of the 1,1β²-bis(o-carborane) ligand:catalytically-active species stabilised by B-agostic BβHβRu interactions
The compound (p-cymene)Ru[(C2B10H10)2], an effective Lewis acid catalyst, is the precursor to a number of products in which the 1,1β²-bis(o-carborane) unit displays an unprecedented range of ligating modes.</p
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