Reactions of phosphine with hexacyclo[6.6.0.02,6.03,13.04,11.05,9]-tetradecan-10-one derivatives
作者:Tahsin J. Chow、Lih-Pyng Li、Vincent Y. R. Lee、Kuan-Jiuh Lin、Chong-Yow Chen
DOI:10.1039/p29960002681
日期:——
reacts with triphenylphosphine or triethylphosphite to form phosphonium salts 3 and 7 which fragment to an iodide 4 upon heating. The mechanism of C–C bond formation induced by phosphine and phosphite is discussed. A 1,3,2-dioxaphospholane 8 was synthesized from diketone 1 in two steps through an intermediate diol 10, although an attempt for a direct condensation of 1 and triphenylphosphine was unsuccessful
Strained double bonds in two types of polycyclic hydrocarbons
作者:Chin-Chuan Wei、Tahsin J. Chow、Ya-Ping Yang、Yao-Jung Chen
DOI:10.1016/s0040-4020(01)80363-x
日期:1993.3
compounds 1 and 2 with pyramidalized double bond are prepared from their corresponding halides. Both of them are stable at ambient temperature but gradually transform to the epoxides upon exposing to air. Cycloaddition with either anthracene or cyclopentadiene yield the corresponding [4 + 2] adducts.
Transannular Interactions in Polycyclic Hydrocarbons. The System of Cage-Shaped Hexacyclo[6.6.0.02,6.03,13.04,11.05,9]tetradecane Derivatives
作者:Tahsin J. Chow、Chin-Chuan Wei、Tung-Kung Wu、Hans-Dieter Martin、Bernhard Mayer
DOI:10.1021/jo00122a055
日期:1995.9
The gas phase He(I alpha) photoelectron spectra (PES) of several ketone and olefinic derivatives of the titled compound are measured. The high energy pi-orbitals (HOMO and SHOMO) of 1e show an unusually large energy splitting of 0.90 eV, while the corresponding n-orbitals of 1d appear to be nearly degenerate (<0.1 eV). The difference between these observations is analyzed with the aid of theoretical models. It is concluded in this work that the pi-pi energy splitting of 1e is derived mainly from an orbital interaction transmitted through-space (TS) across the ring. Since such a nonbonded interaction is sensitive to distance, a conformational analysis of the cycloctane ring moiety of 1e is also performed. As compared to the result of PES, it seems that the ab initio (STO-3G) method is more reliable than AM1, in which the TS interaction is somewhat underestimated.
CHOW, TAHSIN J.;WU, TUNG-KUNG, TETRAHEDRON LETT., 30,(1989) N0, C. 1279-1280
作者:CHOW, TAHSIN J.、WU, TUNG-KUNG
DOI:——
日期:——
CHOW, TAHSIN J.;WU, TUNG-KUNG, J. ORG. CHEM., 53,(1988) N 5, 1102-1103