View all references Unfortunately, only lower monoesters or their salts are available at costs reasonable for preparative work, for example, EtO 2 CCH 2 CO 2 H, EtO 2 CCH 2 CO 2 K, and MeO 2 CCH 2 CO 2 K. In contrast the price of tert??BuO 2 CCH 2 CO 2 H, which is required for the simultaneous introduction of bulky tert??Bu protective group in the products, is extremely high. ... In our current work we were forced to find a simple and cheap method for ...
