(+/-)-(5,5-ethanediyldioxy-10-oxo-(4b
r,8a
t)-4b,5,6,7,8,8a,9,10-octahydro-[9]phenanthryl)-glyoxylic acid ethyl ester 在
glass powder 作用下,
生成
(+/-)-5,5-ethanediyldioxy-10-oxo-(4br,8at)-4b,5,6,7,8,8a,9,10-octahydro-phenanthrene-9-carboxylic acid ethyl ester