111029-50-6Relevant articles and documents
Highly efficient ring closure of aromatic dialdehydes to macrocyclic allenes
Brody, Marcus S.,Williams, Robin M.,Finn
, p. 3429 - 3433 (1997)
The one-pot double deoxygenation of simple alkyl- and polyether-tethered aromatic dialdehydes to give macrocyclic allenes has been accomplished in extraordinarily high yield without the need for slow-addition techniques, using a Ti(IV)-substituted ylide reagent and bis(trimethylsilyl)amide bases. Diastereoselective allene formation occurs when a binaphthyl unit is present in the substrate backbone, and the resulting cyclic allene is characterized by X-ray diffraction. Highly efficient cyclization is proposed to be the result of a combination of preorganization about the amide base counterion and a low concentration of the immediate precursor to Wittig-style olefination ring closure.
Spacer length dependent architectural diversity in bis-dipyrrin copper(II) complexes
Paitandi, Rajendra Prasad,Singh, Roop Shikha,Mukhopadhyay, Sujay,Kumar, Ashish,Pandey, Daya Shankar
, p. 5420 - 5430 (2017/04/28)
A series of copper(ii) complexes (1-9 and 3′) derived from bis-dipyrrin ligands (L1-L9 and L3′) with diverse spacer lengths [-(CH2)n-] have been described. Structural diversities in these complexes have been explicitly established by spectral and structural studies on these and a closely related nickel(ii) complex (3′′). All the ligands and complexes have been thoroughly characterized by spectroscopic studies (ESI-MS, IR, 1H, 13C NMR, UV/vis) and structures of 2, 3′, 3′′, 6, 8 and 9 were determined by X-ray single crystal analyses. It has been unambiguously established that ligands with n ≤ 6 gave heteroleptic binuclear (1-5), while those with n ≥ 7 yielded homoleptic mononuclear (6-9) bis-dipyrrinato complexes. Spectral and structural studies revealed distorted square planar (1-5) and distorted tetrahedral geometries (6-9) about the copper(ii) centre in these complexes which has further been evidenced by EPR and electrochemical studies. Structural differences based on the odd and even number of methylene spacers in these complexes have been supported by DFT studies. A line between the syn- and anti-conformations of the complexes has been drawn on the basis of a limiting spacer length.
Hexahelicenophanes
Meier, Herbert,Schwertel, Manfred,Kolshorn, Heinz
, p. 2009 - 2019 (2013/12/04)
A reaction sequence was studied for the preparation of cyclophanes 12, which contain 2,7-bis(2-phenylethenyl)naphthalene chromophores and polymethylenedioxy chains of different length. The irradiation of 12 in the presence of I2 led then, by ox
