Syntheses of Negative Photochromic Crowned Spirobenzopyrans
摘要:
Two synthetic routes to negative photochromic spirobenzopyrans bearing a monoazacrown moiety at the 8-position were described and compared. Method B gives much higher total yield than method A.
Syntheses of Negative Photochromic Crowned Spirobenzopyrans
摘要:
Two synthetic routes to negative photochromic spirobenzopyrans bearing a monoazacrown moiety at the 8-position were described and compared. Method B gives much higher total yield than method A.