... The solution was then transferred to a cy- lindrical quartz tube (15 x 1.5 cm) and degassed by passing a slow stream of nitrogen through the solution for 10 min. The (29) A. I. Vogel, "Practiaal Organic Chemistry," Wiles, New York, N. Y., 1956, p 332. ... J. Org. Chem., Vol. 36, No. ...