References
- Piccardi , P. , Marcaletti , S. , Bianchini , E. and Abis , L. 1977 . J. Chem. Soc., Perkin , 1 : 624
- Breitmaier , E. and Voelter , W. 1974 . 13C NMR Spectroscopy , 96 Verlag Chemie .
- March , Jerry . 1977 . Advanced Organic Chemistry: Reactions, Mechanism and Structure , 465 – 466 . Mc Graw-Hill, Kogakusha LTD .
- Breitmaier , E. and Voelter , W. 1974 . 13C NMR Spectroscopy , 155 Verlag Chemie .
- Matsuo , M. and Urano , S. 1976 . Tetrahedron , 32 : 229
- Chemical shifts are referred to TMS.
- Multiplicity due to the coupling with protons is indicated in brackets as follows: (coupling over one bond, coupling over two or more bonds). s=singlet, d=doublet, t=triplet, q=quartet, st=se ptet, m=multiplet.