1,7-Dimethyl­penta­cyclo­[5.4.0.02,6.03,10.05,9]undecane-8,11-dione

STUDIES IN REGIOSPECIFIC OXIDATION REACTIONS OF 1-METHYL PENTACYCLO[5.4.0.02,6.03,10.05,9]UNDECANE–8,11–DIONE Indu Vappala, M.Sc Thesis Prepared for the Degree of MASTER OF SCIENCE UNIVERSITY OF NORTH TEXAS

Crystal structure of the cage derivative penta­cyclo­[5.4.0.02,6.03,10.05,9]undeca-8,11-dione ethyl­ene di­thio­ketal

The title penta-cyclo-undecane cage derivative, C13H14OS2, was identified during a thio-ketalization reaction. The reaction selectively gave the title compound and the product corresponding to bis-ketal was not formed. The title compound exhibits unusual Csp (3)-Csp (3) single bond lengths ranging from 1.495 (3) to 1.581 (2) and strained bond angles as small as 89.29 (12) and as large as 115.11...

N,N′-[(8-endo,11-endo-Dihy­droxy­penta­cyclo­[5.4.0.02,6.03,10.05,9]undecane-8,11-di­yl)bis­(methyl­enecarbon­yl)]di-l-phenyl­alanine

The title compound, C(33)H(36)N(2)O(8), is the first example of a disubstituted peptidic pentacycloundecane (PCU) diol. The structure displays an array of inter- and intra-molecular hydrogen bonding by both amide and alcohol functional groups. This hydrogen-bonding system connects the mol-ecules into a three-dimensional network.

Crystal structures of 3,6-di­allyl­tetra­cyclo[6.3.0.04,11.05,9]undeca-2,7-dione and 1,7-di­allyl­penta­cyclo­[5.4.0.02,6. 03,10.05,9]undecane-8,11-dione: allyl­ated caged compounds

The title compounds, C17H20O2 (1) and C17H18O2 (2), are allyl-ated caged compounds. In (1), the carbon atoms bearing the allyl groups are far apart [2.9417 (17) Å], hence the expected ring-closing metathesis (RCM) protocol failed to give a ring-closing product. When these carbon atoms are connected by a C-C bond as in (2), the distance between them is much smaller [1.611 (3) Å] and consequently...

tert-Butyl N-[(11-exo-benzyl­oxy­carbonyl-8-oxopenta­cyclo­[5.4.0.02,6.03,10.05,9]undecane-11-endo-yloxy)carbon­yl­methyl]carbamate

The structure of the title compound, C(26)H(29)NO(7), at 173 K has an inter-molecular N-H⋯O hydrogen bond. This is one of the few examples where a mono-ketone penta-cyclo-undecane (PCU) mol-ecule exibits hydrogen bonding in the solid state. The dihedral angles of the amide and ester groups are normal and unaffected by the cage structure. A longer than normal C-C bond [1.571 (4) Å] was found wit...