Journal of the American Chemical Society p. 2251 - 2258 (1995)
Update date:2022-07-30
Topics:
Jouaiti, Abdelaziz
Geoffroy, Michel
Terron, Gustavo
Bernardinelli, Gérald
The new diphosphaalkene 1,3-bis[2-(2,4,6-tri-tert-butylphenyl)phosphanediylmethyl]benzene, L, has been synthesized. Due to the presence of two P=C bonds three isomers (EE, EZ, ZZ) were observed by 31P NMR, and the crystal structures of two of them could be determined (EE, ZZ). The electrochemical behavior of L has been studied by cyclic voltametry: a quasi-reversible reduction occurs at -1.89 V/SCE and corresponds to the formation of a radical anion which has been studied by ESR at variable temperature. The experimental 31P and 1H hyperfine constants are consistent with free rotation about the P=C and Cph0sphaalkene-Cbenzene bonds at room temperature and agree with ab initio predictions. One of the isomers of L forms complexes with palladium(II) and platinum(II) ions. The crystal structures show that L is orthometalated and acts as a terdentate ligand by coordinating the metal with each phosphorus atom. These complexes are electrochemically reduced between -0.92 and -1.29 V, and the resulting paramagnetic species are studied by ESR in liquid and frozen solutions. This reduction process was shown to be a ligand-centered process, an appreciable part of the unpaired electron is localized on each of the phosphaalkene carbons (20%) and phosphorus atoms (5%).
View MoreHe Bei Shun Er Chemical Co., LTD.
Contact:86-0311-86996932/86860168
Address:No 18,North street
Chengdu Pukang Biotechnology Co., Ltd
Contact:+86-28-82550498
Address:No. 558 Rulin Road,Xinjin county,Chengdu city, China
Contact:+86-10-59484199
Address:No.58-A1026 Liangguan Street
NINGBO PANGS CHEM INT’L CO., LTD.
Contact:+86-0574-27666801
Address:Floor 21, Building 11, Xintiandi, No. 689, Shijiroad, Ningbo, Zhejiang, China
website:http://www.truewingroup.com
Contact:86-311-66699812
Address:NO.600 ZHONGSHAN EAST ROAD SHIJIAZHUANG
Doi:10.3109/14756366.2013.805755
(2014)Doi:10.1021/acs.jmedchem.7b01927
(2018)Doi:10.1016/j.tetlet.2014.05.112
(2014)Doi:10.1016/j.tet.2014.03.102
(2014)Doi:10.1007/s11172-013-0379-4
(2013)Doi:10.1016/j.ejmech.2014.06.013
(2014)