Cyclodecane cycloheptane

The photodecomposition of -alkanes at excitation energies slightly above the absorption onset involves both C-H and C-C bond decompositions [18]. The dominant process is the C-H scission, (H2) 0.8-0.9, and the contribution of C-C decomposition is small. In the photolysis of cyclohexane, cycloheptane, cyclooctane, and cyclodecane, however, only hydrogen evolution was observed [[Pg.375]

Figure 7 G(Si) value as a function of the carbon atom numbers in the molecules. When more than one measured value was published, we tried to select the most probable value. Alkanes (1) propane, (2) w-butane, (3) w-pentane, (4) cyclopentane, (5) w-hexane, (6) cyclohexane, (7) w-heptane, (8) cycloheptane, (9) methylcyclohexane, (10) w-octane, (11) cyclooctane, (12) isooctane, (13) w-decane, (14) cyclodecane, (15) cw-decalin, (16) trawx-decalin, (17) w-dodecane, (18) dicyclohexyl, (19) n-hexadecane. (From Refs. 18, 29, 65, 92, 148, and 155.)...

The skeletal isomerization of cycloalkanes with more than six carbon atoms, that is cycloheptane, cyclooctane, cyclodecane, and cyclododecane, was performed over S04/Zr02 in the liquid phase at 50 °C. 

Rings larger than six-membered are always puckered unless they contain a large number of sp atoms (see the section on strain in medium rings, p. 223). The energy and conformations of the alkane series cycloheptane to cyclodecane... 

Letcher and coworkers investigated the excess heat of mixing of alkynes with different solvents such as cycloalkanes(cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclodecane) with an -alkyne (n-hexyne or n-heptyne or -octyne) bicyclic compounds[decahydronaphthalene (CioHig), bicyclohexyl (CnHii) L2,3,4-tetrahydronaphthalene (C10H12), cyclohexylbenzene (C12H16)] with -hexyne or n-heptyne benzene with n-hexyne , w-heptyne or -octyne and finally, 1,3,5-trimethylbenzene with n-hexyne -heptyne or w-octyne. ... 

Precatalyst 27 has shown surprising results in the metathesis of cyclooctane and cyclodecane with broad distribution of lower and higher macrocyclic alkanes. Cyclopentane, cyclohexane, and cycloheptane were found to be inactive under similar condition [79]. 

This can be thermodynamically explained in that the ring-strain energy is less suitable for the formation of cyclononane from cyclodecane than the formation of cycloheptane from COA (or cyclohexane from cycloheptane) [144]. Overall, these reactions successfully yielded the ring expansion, ring contraction, but this system suffers from the formation of polymers as major products [145]. 

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