CONFORMATION OF THE PIPERIDINE RING IN ISOMERIC 1,2,5-TRIMETHYL-4-PHENYL(TRIORGANOSILYL)PIPERIDIN-4-OLS FROM THE PMR SPECTRA Article Fomichev A.A., Golovtsov N.I., Rezakov V.A., Varlamov A.V., Prostakov M.S. Chemistry of Heterocyclic Compounds. Латвийский институт органического синтеза Латвийской академии наук / Springer New York Consultants Bureau. Vol. 22. 1986. P. 1208-1213