[EN] STRIGOLACTAM DERIVATIVES AS PLANT GROWTH REGULATING COMPOUNDS [FR] DÉRIVÉS DE STRIGOLACTAME EN TANT QUE COMPOSÉS RÉGULATEURS DE LA CROISSANCE DES PLANTES
allyltrichlorostannane 、 lithium aluminium tetrahydride 以
further solvent(s) 为溶剂,
以34%的产率得到2-propenylstannane
参考文献:
名称:
Structures of Vinylstannane (Ethenylstannane) and Allylstannane (2-Propenylstannane) Determined by Gas-Phase Electron Diffraction and Quantum Chemical Calculations
摘要:
Vinylstannane (H2C=CHSnH3) and allylstannane (H2C=CHCH2SnH3) have been synthesized, and their structures and conformational properties have been determined by A initio and density functional theory calculations and gas electron diffraction. There is only one stable conformation of vinylstannane, where one of the Sn-H bonds is synperiplanar to the double bond. The most important structural parameter is the C(sp(2))-Sn(IV) bond length, which is r(a) = 215.1(6) pm (r(c) = 214.1(6) pm). The CCSn bond angle is 121.6(4)degrees. Uncertainties are estimated errors equal to 2.5 times the least-squares standard deviation and include uncertainty in the electron wavelength. Theoretical calculations indicate that there are two stable rotameric forms of allystannane. The C=C-C-Sn chain of atoms is synperiplanar (dihedral angle = 0 degrees) in the less stable form and anticlinal (dihedral angle approximate to 106 degrees from synperiplanar) in the more stable rotamer. Theoretical calculations predict an energy difference between the two conformations of about 10 kJ mol(-1). There is no indication of the presence of the synperiplanar conformation in the gas phase at room temperature. The final analysis was therefore carried out assuming that only the anticlinal conformer was present. The C=C-C-Sn dihedral angle was found to be 102.9(19)degrees from the synperiplanar conformer, which is the smallest value found for this angle in the C=C-C-X (X = C, Si, Ge, Sn) series of compounds. The C(sp(3)) -Sn(IV) bond length is r(a) = 218.9(8) pm (r(e) = 217.6(8) pm), and the CCSn bond angle is 110.9(6)degrees. The B3LYP calculations using the cc-pVTZ basis set for C and H and the cc-pVTZ-PP basis set for Sri reproduce the experimental r(e)(C-Sn) bond distances very well, while the MP2(FC) calculations underestimate the r(e)(C-Sn) bond distances by 3-4 pm.
There are disclosed compounds of formula (I) ##STR1## and pharmaceutically acceptable salts thereof which are useful as antagonists of GnRH and as such may be useful for the treatment of a variety of sex-hormone related conditions in both men and women.
Organotin-mediated selective desulfurization: tri-n-butyltin hydride reduction of unsymmetric sulfides
作者:Carlos G. Gutierrez、Leo R. Summerhays
DOI:10.1021/jo00200a039
日期:1984.12
Structures of Vinylstannane (Ethenylstannane) and Allylstannane (2-Propenylstannane) Determined by Gas-Phase Electron Diffraction and Quantum Chemical Calculations
Vinylstannane (H2C=CHSnH3) and allylstannane (H2C=CHCH2SnH3) have been synthesized, and their structures and conformational properties have been determined by A initio and density functional theory calculations and gas electron diffraction. There is only one stable conformation of vinylstannane, where one of the Sn-H bonds is synperiplanar to the double bond. The most important structural parameter is the C(sp(2))-Sn(IV) bond length, which is r(a) = 215.1(6) pm (r(c) = 214.1(6) pm). The CCSn bond angle is 121.6(4)degrees. Uncertainties are estimated errors equal to 2.5 times the least-squares standard deviation and include uncertainty in the electron wavelength. Theoretical calculations indicate that there are two stable rotameric forms of allystannane. The C=C-C-Sn chain of atoms is synperiplanar (dihedral angle = 0 degrees) in the less stable form and anticlinal (dihedral angle approximate to 106 degrees from synperiplanar) in the more stable rotamer. Theoretical calculations predict an energy difference between the two conformations of about 10 kJ mol(-1). There is no indication of the presence of the synperiplanar conformation in the gas phase at room temperature. The final analysis was therefore carried out assuming that only the anticlinal conformer was present. The C=C-C-Sn dihedral angle was found to be 102.9(19)degrees from the synperiplanar conformer, which is the smallest value found for this angle in the C=C-C-X (X = C, Si, Ge, Sn) series of compounds. The C(sp(3)) -Sn(IV) bond length is r(a) = 218.9(8) pm (r(e) = 217.6(8) pm), and the CCSn bond angle is 110.9(6)degrees. The B3LYP calculations using the cc-pVTZ basis set for C and H and the cc-pVTZ-PP basis set for Sri reproduce the experimental r(e)(C-Sn) bond distances very well, while the MP2(FC) calculations underestimate the r(e)(C-Sn) bond distances by 3-4 pm.
[EN] STRIGOLACTAM DERIVATIVES AS PLANT GROWTH REGULATING COMPOUNDS<br/>[FR] DÉRIVÉS DE STRIGOLACTAME EN TANT QUE COMPOSÉS RÉGULATEURS DE LA CROISSANCE DES PLANTES
申请人:SYNGENTA PARTICIPATIONS AG
公开号:WO2013092430A1
公开(公告)日:2013-06-27
The present invention relates to novel strigolactam derivatives of formula (I), to processes and intermediates for preparing them, to plant growth regulator compositions comprising them and to methods of using them for controlling the growth of plants and/or promoting the germination of seeds.