Adamantane-like cage compounds

The ternary Cu4SnPio with an unusual Sn Cu3 unit is the only compound with the adamantane-like Pio cage. This is remarkable, because in that region of composition some... 

Despite the greater thermal stability of the four-membered alkyl substituted cyclodisil-thianes, the cage compounds (RSi)4S6 are thought to possess the adamantane-like structure. The methyl derivative has such a structure (Si-S bond lengths 212.9 pm), Jike the germanium and tin derivatives36. 

A sealed-tube pyrolysis of BMes yields 25 % of a compound (BMe)6(CH)4. N.m.r. spectra are consistent with the presence of 6 equivalent BMe and 4 equivalent CH groups. Hence an adamantane-like structure (39) was proposed for the cage. ... 

Adamantane (CAS No 281-23-2) l-tricyclo[3.3.1.1 ]decane is a cage hydrocarbon with a white or almost white crystalline solid nature, like solid wax, at normal conditions. Its odor resembles that of camphor. It is a stable and nonbiodegradable compound that is combustible due to its hydrocarbon nature. It has not been found to be hazardous or toxic to living entities [14, 15]. It should be pointed out that adamantane can exist in gas, liquid, and two solid crystalline states. 

Another class of compounds that has attracted much interest are the sesquioxides and sesquichalcogenides of the type (RE)2nY3 [(M2Y3) ] (E = Si, Ge, Sn Y = O, S, Se), due to their unique structural properties. These molecules have polyhedral cage-like structures analogous to those of bicyclo[l.l.l]pentane (n = 1) (1), adamantane (n = 2)... 

The chemistry of adamantane and related cage-like hydrocarbons has developed rapidly in recent years. These developments, encompassing a broad spectrum of the chemical world, have not been stimulated by any unique properties associated with the cage strutures of these molecules the chemistry of such systems is typically hydrocarbon in nature. The particular utility of cage-like substrates in a variety of chemical investigations arises, for the most part, from their conformational rigidity variables (e.g. those associated with structure) appropriate to more mobile compounds are often eliminated by the use of cage-like systems. The availability, ease of functionalization, and the near ideal structure of adamantane make it extremely useful for this purpose. 

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