TY - JOUR
T1 - Preparation and X-ray analysis of 2,2',3,3'-tetraphosphinidene 1,1'- bicyclobutyl
AU - Yoshifuji, Masaaki
AU - Yamada, Naoki
AU - Maack, Andreas
AU - Toyota, Kozo
N1 - Funding Information:
The reaction of (E,E)-I with tert-butyllithium followed by quenching with water gave a diastereomeric mixture of -tert-buty-3-(246-tri-tert-butyphenyphsphinidene)-4-(246-tri-tert-butyphenyphsphin)- cyclobutene (6) in 41% yield, 20 suggesting that a nucleophilic attack of the tert-butyl group proceeded on the C--C bond under the reaction conditions. On the other hand, attempted reactions of (E,E)-I with methyllithium or phenyllithium, followed by quenching with iodine, failed to give a similar reaction product. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japanese Government. N. Yamada and A. Maack thank the Japan Society for Promotion of Science fellowships. The authors also thank Shin-Etsu Chemical Company for donation of organosilicon compounds.
PY - 1998/12/17
Y1 - 1998/12/17
N2 - A sterically protected diphosphinidenecyclobutene with the 2,4,6-tri- tert-butylphenyl group was allowed to react with tert-butyllithium and iodine, successively, to give 2,2',3,3'-tetraphosphinidene-1,1'-bicyclobutyl derivative, and the structure was confirmed by X-ray analysis, showing unusual short contact between the C=P moieties at the 2 and 2' positions. A strong through-space interaction between them appears to play an important role in rationalization of the 31P NMR and UV/Vis.
AB - A sterically protected diphosphinidenecyclobutene with the 2,4,6-tri- tert-butylphenyl group was allowed to react with tert-butyllithium and iodine, successively, to give 2,2',3,3'-tetraphosphinidene-1,1'-bicyclobutyl derivative, and the structure was confirmed by X-ray analysis, showing unusual short contact between the C=P moieties at the 2 and 2' positions. A strong through-space interaction between them appears to play an important role in rationalization of the 31P NMR and UV/Vis.
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U2 - 10.1016/S0040-4039(98)02150-9
DO - 10.1016/S0040-4039(98)02150-9
M3 - Article
AN - SCOPUS:0032542133
VL - 39
SP - 9481
EP - 9484
JO - Tetrahedron Letters
JF - Tetrahedron Letters
SN - 0040-4039
IS - 51
ER -