... M etkd -?-quno-2-( 7-meth0,~yI -nuphthyl) acetatc (4) To ii hot ( I 10°C) solution of 3 (19.7 g, 0.1 mole) in dimethylcarbonate (1 20 ml), sodium (2.3 g, 0. I atg) is added slowly during 30 min. The mix- ture is then maintained at this temp. ... 1 2 3 4 5 ... (Weinheim) 326, 119-/20 (1993)