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14) Spinning speeds were 1.7 kHz at 40 K and above. Spinning speed dropped slowly as the temperature was lowered and reached 1 kHz at 6 K. This change is reflected in spinning side bands which are identified in the spectra shown in Figure 2. Their presence should not interfere with identification of sidebands indicative of tunneling.( I 5 ) For accounts of the classical vs nonclassical ion controversy, see: (a) Grob, C. A.(8) Trapping of nonequilibrium ratios of (a-(phenylthio)alkyl)ltthium4 and (n-bromoalkyl)lithium reagents3b with in situ carbonyl compounds or Me,SiCI has been reported (9) This compound was prepared in isomerically pure form (>991) by crystallization. This is an important advantage of the 3.5-diphenylcyclohexyl system over the traditional 4-rert-butylcyclohexyl locked cyclohexane.(IO) This effect was discovered by KriePb and has been used to prepare the less stable of two diastereomeric lithium reagents.',& 0002-7863/90/ 15 12-8994$02.50/0 0 1990 American Chemical Society

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