References
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- NMR spectra were obtained on a Varian T-60A Spectrometer. IR spectra were recorded on a Perkin-Elmer Model 21 spectrophotometer. UV spectra were recorded on a Cary 14. Melting points were determined on a Fisher-Johns apparatus and are uncorrected. Microanalysis were performed by the Spang Microanalytical Laboratory, Eagle Harbor, Michigan. Solvents were purified and dried by stà;ndard methods. All evaporations of solvents were carried out at 35°C under reduced pressure. Thin-layer chromatography (TLC) was performed on silica gel 60 HF-254 [E. Merck A. G. Darmstadt, plates of 0.25 mm thickness]. The spots were visualized by ultraviolet light emitting radiation at 254 nm.
- Codington , J. , Fecher , R. and Fox , J. 1962 . J. Org. Chem , 27 : 163 – 167 .
- Obenland , C. O. , Mangold , D. J. and Marino , M. P. 1966 . Inorg. Syn. , 8 : 53 – 56 .