摘要:
Radicals a to the carbonyl of ethyl 3,4,4-trimethylpentanoate couple with little stereoselectivity while analogous tertiary radicals derived from ethyl 2,3,4,4-tetramethylpentanoate disproportionate at 25 degrees C to give the corresponding alkene and alkane. The alkane is formed by disproportionation with a diastereoselectivity of greater than 20:1.