61144-80-7Relevant academic research and scientific papers
Synthesis, Structure, and Fluorescence Properties of 5,17-Distyryl-25,26,27,28-tetrapropoxycalix[4]arenes in the Cone Conformation
Larsen, Mogens,Krebs, Frederik C.,Jorgensen, Mikkel,Harrit, Niels
, p. 4420 - 4424 (2007/10/03)
The HWE (Horner-Wadsworth-Emmons) reaction performed on the easily obtainable 5,17-diformylcalix[4]arenes (cone) with arylmethyl phosphorus ylides yielded 5,17-distyryl-25,26,27,-28-tetrapropoxycalix[4]arenes (cone) in high yield and purely in the E/E configuration. Compounds 2-5 were prepared this way containing bromine. Subsequent bromine-lithium exchange and reaction with trimethoxyborane yielded the dihydroxyboryl-substituted 5,17- distyrylcalix[4]arenes 6-7a. The structures of 3, 5, and 7a were determined by X-ray diffraction. The photophysical properties of 2 were established by absorption and fluorescence spectroscopy and compared to the monomeric fluorophore, 3,5-dimethyl-4-propoxy-(E)-stilbene (10).
Syntheses and Spectral Characterizations of Tricarbonylchromium Complexes of Calixarenes
Iki, Hideshi,Kikuchi, Taketoshi,Shinkai, Seiji
, p. 205 - 210 (2007/10/02)
The 1:1 arene-tricarbonylchromium complexes were synthesized for the first time from four conformational isomers of 25,26,27,28-tetrapropoxycalixarene (14Pr) and Cr(CO)6.The 1:2, 1:3 and 1:4 complexes of cone-14Pr were also synthesized by increasing the ratio of Cr(CO)6 against cone-14Pr.The 1:2 complex was a mixture of two compounds, which were identified as distal and proximal isomers of cone-14Pr*2Cr(CO)3.The relative stability of the 1:1 complex was estimated via its oxidation by CuCl2.The pseudo-first-order rate constants appeared to be in the order of 1,3-alternate-14Pr > 1,2-alternate-14Pr > cone-14Pr > 2,6-dimethylanisole.The results indicate that the 14r*Cr(CO)3 complexes are less stable than the corresponding monomeric complex.The 1:1 complexes with partial-cone-14Pr and 1,2-alternate-14Pr were demonstrated to be a pair of racemates by 1H NMR spectroscopy using a chiral shift reagent (Pirkle's reagent).
Meta Substitution in Electrophilic Benzylations of 2,6-Dimethylphenol and Alkyl 2,6-Dimethylphenyl Ethers: Product Distributions and Mechanism
Miller, Bernard,McLaughlin, Michael P.,Marhevka, Virginia C.
, p. 710 - 719 (2007/10/02)
Electrophilic benzylations of 2,6-dimethylphenol and 2,6-dimethylanisole under a variety of conditions yield ca. 40 percent and 70percent, respectively, of the meta substitution products, although other electrophilic substitution reactions appear to proce
