(3S,4S)-3,4-Bis-(tert-butyl-dimethyl-silanyloxy)-hept-1-en-6-yne 、 alkaline earth salt of/the/ methylsulfuric acid 生成 (5S,6S,6aR)-5,6-Bis-(tert-butyl-dimethyl-silanyloxy)-4,5,6,6a-tetrahydro-1H-pentalen-2-one 、 (5S,6S,6aS)-5,6-Bis-(tert-butyl-dimethyl-silanyloxy)-4,5,6,6a-tetrahydro-1H-pentalen-2-one