The process according to this invention is useful as a method for producing {HEAD ~ an estrone} acetal as an estrone precursor in {TAIL ~ the industrial scale} 
The process according to this invention is useful as a method for producing { HEAD ~ an estrone } acetal as an estrone precursor in { TAIL ~ the industrial scale }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL