In this study, nickel-catalyzedcoupling reactions between arylhalides and tert-alkyl Grignardreagents were developed. Our original bicyclic NHC ligands reduced the formation of isomerized products, and we found that NMP as a co-solvent suppressed the reduction process. Under the optimal conditions we developed, the catalyst loading was lowered to 0.5 mol %, and catalyst loading using ortho-substituted
Aromatic Cyclodehydration. XXVII.<sup>1</sup> Cyclization of Aldehydes, Ketones and Ketonitriles
作者:Charles K. Bradsher、Winston J. Jackson
DOI:10.1021/ja01632a029
日期:1954.2
THE NEAR-ULTRAVIOLET SPECTRA OF SOME 9-ALKYLPHENANTHRENES
作者:F. A. L. Anet、P. M. G. Bavin
DOI:10.1139/v63-316
日期:1963.9.1
The ultraviolet spectra are reported of a series of 9-alkylphenanthrenes. The bathochromic shifts relative to phenanthrene of the longest-wavelength (α) band are not explicable in terms of hyperconjugation. It is suggested that the band envelope is influenced by the rotameric forms of the alkyl substituents.