712-25-4Relevant articles and documents
The clemmensen reduction of pentacyclo [6.4.0.02,7.03,11.0 6,10]dodecane-9,12-dione
Martins,Fourie,Venter,Wessels
, p. 623 - 632 (1990)
The Clemmensen reduction of pentacyclo[6.4.0.02,7.03,11.0 6,10]= dodecane-9,12-dione unexpectedly led to the formation of pentacyclo[6.4.0. 02,6.05,9.04, 12]-2-dodecanol and pentacyclo[6.4.0.02,7.03,11.0 6,10]dode= cane-1,8-diol as main products. Tetracyclo[6.4.0.05,9.0412dodecane-2,7-dione and its corresponding hemiacetal were obtained as byproduc structures of the Clemmensen products were elucidated from an extensive 1H and 13C n.m.r. study.
The influence of hydrate formation on the Clemmensen reduction of pentacyclo [5.4.0.02,6;03,10;05,9]undecane-8,11-dione and pentacyclo[6.4.0.02,7.03,11.06,10]dodecane-9,
Martins,Viljoen,Coetzee,Fourie,Wessels
, p. 9215 - 9224 (2007/10/02)
Hydration of pentacyclo [5.4.0.02,6,03,10.05,9]undecane-8,11-dione led to the formation of a mixture of a geminal diol (80%) and a transannular hydrate (20%) and not to only the latter as previously accepted. Compounds with smaller intercarbonylic distances formed only transannular hydrates which promoted rearrangement reactions during Clemmensen reduction. The transannular hydrate of pentacyclo [6.4.0.02,7.03,11.06,10]dodecane-9,12-dione produced pentacyclo [6.4.0.02,6.05,9.04,12]-2-dodecanol.
Barriers to Intramolecular Hydride Transfers in Some Polycyclic Hydroxyketones
Craze, Gabrielle-Anne,Watt, Ian
, p. 175 - 184 (2007/10/02)
The hydroxyketones (1) and (2) have been prepared from the Diels-Alder adducts of p-benzoquinone with cyclopentadiene and cyclohexa-1,3-diene.The boron trifluoride-ether catalysed reaction of cyclohepta-1,3-diene with p-benzoquinone gave good yields of the Diels-Alder adduct which was converted into hydroxyketone (3).Experiments with cyclohexanol and admantan-2-ol established characteristic 13C n.m.r. chemical shifts associated with deprotonation of alcohols by dimsyl sodium in dimethyl sulphoxide.Solutions of the sodium salts of (1)-(3) were prepared and dynamic 13C n.m.r. spectroscopy gave barriers for their degenerate rearrangement of >21.7 (100 deg C), 19.0 (100 deg C), and 17.3 (72 deg C) kcal mol-1, respectively.The relationship between variation of barrier and molecular geometry is discussed with the aid of empirical force field calculations.