under a nitrogen atmosphere using standard Schlenk or glovebox techniques.
Solvents were dried using a column solvent purification system.56 (link) Commercial KOtBu (97%), MeLi (1.6
M in Et2O), MeI, MeOH, Et3N, 2-adamantanone,
benzophenone, acetone (99%), 9-fluorenone, and 1,2-diphenylcyclopropenone
were used as purchased. 1H (299.95 MHz), 13C
(75.43 MHz), and 29Si (59.59 MHz) NMR spectra were recorded
on a Varian INOVA 300 spectrometer either in C6D6 solution using the internal 2H-lock signal of the solvent
or in toluene solution with a D2O capillary as an external
lock. Chemical shift values are referenced versus TMS. Compounds
procedures.28 (link) HRMS spectra were run on
a Kratos Profile mass spectrometer equipped with a solid probe inlet.
Infrared spectra were obtained on a Bruker Alpha-P Diamond ATR spectrometer
from the solid samples. Melting points were determined in capillaries
melted off on one side using a Büchi 535 apparatus and are
uncorrected. Elemental analyses were carried out on a Hanau Vario
Elementar EL apparatus. UV absorption spectra were recorded on a PerkinElmer
Lambda 5 spectrometer.