Cubane = pentacyclo octane

Pentacyclo[4.2.0.02 5.03 8.04 7]octane-l,2-dicarboxylic acid (Cubane-1,2-dicarboxylic acid)... 

Knowing the importance of angle and eclipsing strain in the small-ring cycloalkanes, we should expect that these strains would become still more important in going from cyclobutane to bicyclo[1.1.0]butane or from cyclooctane to pentacyclo[4.2.0.02,5.03 8.04,7]octane (cubane). This expectation is borne out by the data in Table 12-6, which gives the properties of several illustrative smallring polycyclic molecules that have been synthesized only in recent years. 

Crown-6 , see 1,4,7,10,13,16-Hexaoxacyclooctadecane, 3555 Crown ethers , see Cyclic poly(ethylene oxides), 0826 CS gas , see 2-Chlorobenzylidenemalononitrile, 3232b Cubane-l,2-dicarboxylic acid, see Pentacyclo[4.2.0.02 5.03,8.04,7]octane-1,2-dicarboxylic acid, 3255... 

Cubane 112 (pentacyclo[4.2.0 0. 0. ]octane) belongs to point group Oh which has been confirmed by X-ray analyses The 28 occupied molecular orbitals of 111 span the following irreducible representations of the group Oh ... 

Pentacyclo[3.3.0.0. " 0. 0 ]octane (or cuneane, CU), the silver ion catalyzed rearrangement product of cubane," gives SB at roughly 1 atm pressure in a first-order reaction with log = 13.82 - 37 700/2.3/ T (Scheme 9.20)." At lower pressures COT is also formed probably from vibrationally hot SB. 

Eventually, internationally recognized systems of nomenclature were devised by a commission of the International Union of Pure and Applied Chemistry they are known as the lUPAC (pronounced eye-you-pack ) systems. In this book, we will use mainly lUPAC names. However, in some cases, the common name is so widely used that we will ask you to learn it (for example, formaldehyde [common] is used in preference to methanal [systematic], and cubane is much easier to remember than its systematic name, pentacyclo[4.2.0.0 0 .0 ]octane). 

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